Bibliografie tematiche / Polymers welding

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Letteratura scientifica selezionata sul tema "Polymers welding"

Autore: Grafiati

Pubblicato: 12 aprile 2025

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Articoli di riviste sul tema "Polymers welding"

MARCUS, MIRANDA, e EROL SANCAKTAR. "Prediction of Ultrasonic Welding Parameters for Polymer Joining". Welding Journal 103, n. 10 (1 luglio 2024): 308–24. http://dx.doi.org/10.29391/2024.103.027.

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Welding of polymers is a useful assembly process that eliminates the need for adhesives or mechanical fasteners, saving consumable costs. One of the most common polymer welding processes is ultrasonic welding. Effective welding requires that the molten polymer chains at the joint surface diffuse across the joint and become entangled with polymer chains in the parts to be welded. This intermolecular diffusion and chain entanglement are the fundamental characteristics of welding. Using fundamental theories of heat generation and melt flow, optimal weld parameters can be calculated to ensure that diffusion across the weld joint occurs during ultrasonic welding.

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Vaz, Cláudio Turani, e Alexandre Queiroz Bracarense. "The Effect of the Use of PTFE as a Covered-Electrode Binder on Metal Transfer". Soldagem & Inspeção 20, n. 2 (giugno 2015): 160–70. http://dx.doi.org/10.1590/0104-9224/si2002.04.

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AbstractStudies have shown that when used as binders for basic covered electrodes, polymers produce a weld metal microstructure with a high acicular ferrite content. The reasons identified for this behavior include changes in the shielding atmosphere and metal transfer mode. To investigate the effect of polymers on metal transfer, voltage oscillograms and high-speed films were recorded during welding with standard-binder and polymer-binder E7018 electrodes using different welding currents. Electrodes tips collected after the arc had been abruptly interrupted were examined metallographically. For electrodes with a polymer binder, the short-circuit frequency was lower regardless of the welding current used and decreased as welding current increased. In many events characterized as short circuits in the voltage oscillograms for polymer-binder electrodes, metal transfer in fact occurred without any arc interruption. The angle between the outer edge of the metal drop and the inner edge of the coating crater showed that the polymer increased the intensity of the plasma jet, and the pinch effect observed during welding using the polymer-binder electrode indicated that there were changes in surface tension and electromagnetic force.

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Singh, Rupinder, Ranvijay Kumar e IPS Ahuja. "Mechanical, thermal and melt flow of aluminum-reinforced PA6/ABS blend feedstock filament for fused deposition modeling". Rapid Prototyping Journal 24, n. 9 (12 novembre 2018): 1455–68. http://dx.doi.org/10.1108/rpj-05-2017-0094.

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Purpose This study aims to highlights the mechanical, thermal and melting behavior compatibility of aluminum (Al)-reinforced polyamide (PA) 6/acrylonitrile butadiene styrene (ABS)-based functional prototypes prepared using fused deposition modeling (FDM) from the friction welding point of view. Previous studies have highlighted the use of metallic/non-metallic fillers in polymer matrix for preparations of mechanically improved FDM feedstock filaments and functional prototypes. But hitherto, very less has been reported on fabrication of functional prototypes which fulfill the compatibility of two polymers for joining/welding-based applications. The compatibility of two dissimilar polymers enables the friction welding for maintenance applications. Design/methodology/approach The twin screw extrusion process has been used for mechanical mixing of metallic reinforcement in polymer matrix, and final blend of reinforced polymers in the form of extruded feed stock filament has been used on FDM for printing of functional prototypes (for friction welding). The methodology involves melt flow index (MFI) investigations, differential scanning calorimetry (DSC) investigations for thermal properties, tensile and hardness testing for mechanical properties and photo micrographic investigations for metallurgical properties on extruded samples. Findings It was observed that the reinforced ABS and PA6 polymers have better compatibility in the terms of similar melt flow, thermal properties and can lead to the better joint efficiency with friction welding. Originality/value In the present work composite feed stock filament composed of ABS and PA6 with reinforcement of Al powder has been successfully developed for preparation of functional prototype in friction welding applications.

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Qiu, Jian Hui, Yang Zhao, Taku Yamamoto e Guo Hong Zhang. "Study on Direct-Weld between Bakelite and Aluminum". Materials Science Forum 675-677 (febbraio 2011): 457–60. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.457.

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Recently in electronic and automobile industry, polymer materials were selected to replace metals in many products because of miniaturization and weight reduction. So the weld between polymers and metals became very important. Currently, the ways were limited to adhesive joint or the mechanical weld which both had obvious defects. In this paper, the direct-welding methods were studied and the welds based on compress-molding were viable and useful. The welding strength enhanced because the reaction between polymers and modified metals were confirmed.

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Liu, Jin-Feng, Ying-Guo Zhou, Shu-Jin Chen, Shao-Qiang Ren e Jun Zou. "Effects of Friction Stir Welding on the Mechanical Behaviors of Extrusion-Based Additive Manufactured Polymer Parts". Polymers 15, n. 15 (3 agosto 2023): 3288. http://dx.doi.org/10.3390/polym15153288.

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The friction stir welding (FSW) of thermoplastic polymers is gradually receiving attention because of its advantages including high efficiency and pollution-free manufacturing. The extrusion-based additive manufacturing (EAM) of polymers has also become one of the main processing methods for thermoplastic parts. In this paper, a hybrid manufacturing method for the FSW process and EAM technology is proposed and explored. The effects of the FSW process using two different welding tools on the mechanical behaviors of 3D printing polymer parts were compared and investigated and the corresponding mechanism was analyzed. The results show that the appropriate welding tool is beneficial for eliminating the anisotropy and decreasing the porosity of 3D-printed parts. Therefore, the improving effects of the FSW process on the mechanical behaviors of the EAM parts are verified. The mechanism was attributed to the high-speed rotation of the welding tool with the appropriate shape, which can promote the flow of polymer melt in the welding region, leading to the formation of dense structures caused by the entanglement of the molecular chains. This study may provide some assistance in modern industrial manufacturing for the processing of large custom components.

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Nonhof, C. J. "Laser welding of polymers". Polymer Engineering and Science 34, n. 20 (ottobre 1994): 1547–49. http://dx.doi.org/10.1002/pen.760342005.

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Olowinsky, Alexander, e Andreas Rösner. "Laser Welding of Polymers". Laser Technik Journal 9, n. 2 (aprile 2012): 52–56. http://dx.doi.org/10.1002/latj.201290023.

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da Conceição, Marceli do N., Javier Anaya-Mancipe, Daniele C. Bastos, Patrícia S. C. Pereira e Elaine V. D. G. Libano. "Influence of Additional Devices and Polymeric Matrix on In Situ Welding in Material Extrusion: A Review". Processes 13, n. 1 (9 gennaio 2025): 171. https://doi.org/10.3390/pr13010171.

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The rise of Industry 4.0 has introduced challenges and new production models like additive manufacturing (AM), enabling the creation of complex objects previously unattainable. However, many polymers remain underutilized due to the need for improved mechanical properties and reduced process-induced anisotropy. ME-based part construction involves successive filament deposition, akin to welding. Upon exiting the nozzle, the polymer solidifies within seconds, limiting the time and temperature available for diffusion and efficient bonding with the adjacent filament. Therefore, optimizing this welding process is essential. The primary objective of this review was to report on the equipment utilized to enhance the bonding between filaments deposited during manufacturing. While higher temperatures improve welding, most equipment cannot endure prolonged high-heat operations, limiting the use of engineering-grade polymers. Modifying polymer matrices by incorporating low-molar-mass molecules can boost welding and mechanical strength. Significant gains in mechanical properties have come from matrix modifications and new in situ welding devices. Reported devices use light (laser, UV IR), electric current, radio frequency and heat collection from the nozzle. The simplest device is a heat collector, while a double laser beam system has achieved the highest mechanical properties without matrix modification. There was an improvement in properties ranging from 20% to 200%.

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Tjahjanti, Prantasi Harmi, Iswanto, Edi Widodo e Sholeh Pamuji. "Examination of Thermoplastic Polymers for Splicing and Bending". Nano Hybrids and Composites 38 (3 febbraio 2023): 87–97. http://dx.doi.org/10.4028/p-8myjhn.

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Materials of thermoplastic polymer when they break is usually thrown away, or is recycled which requires a long process. The purpose of this study is splicing the broken thermoplastic polymer using hot gas hand welding with different variations of welding wire/electrodes. Materials of thermoplastic polymer used are Polyethylene (PE), Polypropylene (PP), and Polyvinyl chloride (PVC) by using welding wire like the three materials. The method is carried out by using hot gas hand welding, there are two materials that cannot be connected, namely PE with PVC welding wire, and PP with PVC welding wire. The permeable liquid penetrant test is PP with PE welding wire, and PVC with PE welding wire. The longest elongation is PE with PE welding wire is 15.96% and the best of bending result is PVC with PVC welding wire reach value 181.2 kgf/mm2. The microstructure was all described in Scanning Electron Microscopy (SEM) observations.

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Rogale, Dubravko, Siniša Fajt, Snježana Firšt Rogale e Željko Knezić. "Interdependence of Technical and Technological Parameters in Polymer Ultrasonic Welding". Machines 10, n. 10 (23 settembre 2022): 845. http://dx.doi.org/10.3390/machines10100845.

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The welding of foils, textiles, and textile composites made of thermoplastic polymer materials using machines with an ultrasonic rotary sonotrode is a high-tech welding technique. Many authors have dealt with only a few parameters in earlier papers, mainly mentioning the speed, i.e., the welding time, and the power of the ultrasonic generator. In this paper, the acoustic model of ultrasonic welding is defined. Based on the model, a group of 44 different parameters important for ultrasonic welding of polymer materials has been summarised, namely 12 parameters of the polymer material, 11 general acoustic and electroacoustic parameters, and 21 technical parameters depending on the ultrasonic machine. Based on this, a comprehensive mathematical derivation was carried out, linking parameter groups with other findings from acoustics, thermodynamics of polymers, and technical and technological parameters of welding polymer materials. The most important parameters are the power of the ultrasonic generator and the welding time, which in practice are adjusted to produce a solid weld. The method of measuring the amplitude of the sonotrode using a photonic sensor is presented in this paper. For 42 groups of welds done at various welding speeds and ultrasonic generator powers, the breaking forces of ultrasonic welds were measured. There are illustrations of power dependence and breaking forces. The accuracy of the mathematical model was confirmed by comparison with the calculation results based on the findings of these measurements.

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Più fonti

Tesi sul tema "Polymers welding"

Albrecht, Mirko, e Michael Gehde. "Welding of incompatible thermoplastic polymers". Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-204024.

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Due to the wide range of properties of plastics (e.g. low density), more and more conventional materials are substituted by polymer materials. Complex requirement profiles on technical parts increase the demand for joining processes that enable the reliable joining of otherwise incompatible thermoplastics. In this case, material bonded connections are approaching their limits. In the following study two incompatible thermoplastic polymers were welded by using polymer blends that are compatible to both components. Industrially relevant thermoplastics polyethylene (PE) and polyamide 12 (PA12) were chosen to demonstrate the potential of an innovative joining technology.

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Wise, Roger Jeremy. "Ultrasonic welding of glassy thermoplastic polymers". Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624545.

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Marcus, Miranda. "Theory Driven Engineering Model to Predict Ultrasonic Weld Strength of Plastics". University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1605556381223829.

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Albrecht, Mirko, André Hüllmann e Michael Gehde. "Potentials and limitations of welding incompatible polymers". Institute for Engineering of Polymer Materials and Dyes, 2017. https://monarch.qucosa.de/id/qucosa%3A20880.

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Due to the wide range of properties of plastics (e.g. low density, low electrical and thermal conductivity), conventional materials will be increasingly substituted by polymers. Multifarious requirements on technical parts intensify the demand for joining processes, which ensure the reliable joining of incompatible thermoplastics. In this case, material bonded joints are approaching their limits. The present study focusses on the welding of two incompatible thermoplastic polymers (polyamide and polyethylene) by using adapted blend materials, which are compatible to both joining components. The results prove the feasibility of this method and indicate the high potential regarding the reachable joint strength. Furthermore, the study demonstrates the challenges regarding the suitable application of blend materials and deals with open scientific questions concerning their industrial usage.

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Strand, Seth R. "Effects of Friction Stir Welding on Polymer Microstructure". Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd338.pdf.

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Kennish, Yolanda Christina. "Development and modelling of a new laser welding process for polymers". Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620051.

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Staicovici, Stefan. "Microwave welding and disassembly of thermoplastic materials using intrinsically conductive polymers /". The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487948807586222.

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Fiedlerová, Eva. "Porovnání efektivnosti technologie svařování plastů a vícekomponentního vstřikování". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229925.

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Diploma thesis is focused on injection molding and welding technology of plastic materials. First, in theoretical part, are commonly described polymer materials, following by description of welding, and multi-injection molding. There are closely described different methods for chosen part. Practical part is about comparison of method according differ criteria and application suitability. At the end of the thesis there is economic estimation of methods.

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Ratanathavorn, Wallop. "Development and evaluation of hybrid joining for metals to polymers using friction stir welding". Licentiate thesis, KTH, Industriell produktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173232.

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Combinations of different materials are increasingly used in the modern engineering structures. The driving forces of this trend are rising fuel costs, global warming, customer demands and strict emission standards. Engineers and industries are forced to improve fuel economy and cut emissions by introducing newly design engines and lightweighting of structural components. The use of lightweight materials in the structures has proved successful to solve these problems in many industries especially automobile and aerospace. However, industry still lacks knowledge how to manufacture components from polymeric materials in combination with metals where significant differences exist in properties. This thesis aims to demonstrate and generate the methodology and guidelines for hybrid joining of aluminium alloys to thermoplastics using friction stir welding. The developed technique was identified, optimized and evaluated from experimental data, metallography and mechanical characterization. The success of the technique is assessed by benchmarking with recent literatures. In this work, lap joints between aluminium alloys (AA5754, AA6111) and thermoplastics (PP, PPS) were produced by the friction stir welding technique. The specimens were joined with the friction stir welding tools under as-received conditions. Metallic chips were generated and merged with the molten thermoplastic to form a joint under the influence of the rotating and translating tool. The effects of process parameters such as rotational speed, translational speed and distance to backing were analyzed and discussed. The investigation found joint strength was dominated by mechanical interlocking between the stir zone and the aluminium sheet. The results also show that the joint strength is of the same order of magnitude as for other alternative joining techniques in the literature.

QC 20150908

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Heidrich, Dario, Eric Brückner e Michael Gehde. "Correlations between injection molding and welding of microcellular materials". Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-230272.

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Due to the rising demand of light-weight constructions as well as the conservation of resources, the density and weight of thermoplastic parts could be influenced significantly by using the thermoplastic foam injection molding process. The structure of the foam injection molded part, which typically means solid surface layers and a cellular core, usually results in a weight saving. Furthermore the materials structure leads to an increasing of the specific bending stiffness with a simultaneous low tendency to warp. The present study was aimed to analyze the interactions between microcellular structure, joining process and the resulting mechanical properties of the molded part. Therefore, the microcellular injection molding process (MuCell®) as well as the vibration welding were used. Whereas the established welding processes for solid injection molded parts have already achieved a high degree of perfection within the last decades, the joining of microcellular thermoplastics entails several specific characteristics, because the injection foaming process highly influences the basic material properties. In contrast to solid materials, the weld seam properties after joining are mainly affected by the design constraints of the microcellular structure.

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Più fonti

Libri sul tema "Polymers welding"

Wise, R. J. Thermal welding of polymers. Cambridge: TWI, 1996.

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Xue, Yongqing. Welding behaviour of semi-crystalline polymers. Eindhoven: Eindhoven University, 1997.

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Wise, R. J. Thermal Welding of Polymers (Abington Publishing Special Report). Woodhead Publishing, 1999.

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Ageorges, C., e L. Ye. Fusion Bonding of Polymer Composites. Springer, 2002.

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Ageorges, C., e L. Ye. Fusion Bonding of Polymer Composites. Springer, 2012.

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Krawczak, Patricia, André Chateau Akué Asséko e Chung-Hae Park, a cura di. Fusion Bonding/Welding of Polymer Composites. MDPI, 2024. http://dx.doi.org/10.3390/books978-3-0365-9964-9.

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Filho, Sergio T. Amancio, e Lucian-Attila Blaga. Joining of Polymer-Metal Hybrid Structures: Principles and Applications. Wiley & Sons, Incorporated, John, 2017.

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Filho, Sergio T. Amancio, e Lucian-Attila Blaga. Joining of Polymer-Metal Hybrid Structures: Principles and Applications. Wiley & Sons, Limited, John, 2017.

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Filho, Sergio T. Amancio, e Lucian-Attila Blaga. Joining of Polymer-Metal Hybrid Structures: Principles and Applications. Wiley & Sons, Incorporated, John, 2017.

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Filho, Sergio T. Amancio, e Lucian-Attila Blaga. Joining of Polymer-Metal Hybrid Structures: Principles and Applications. Wiley & Sons, Limited, John, 2018.

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Capitoli di libri sul tema "Polymers welding"

Gooch, Jan W. "Welding". In Encyclopedic Dictionary of Polymers, 809. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12780.

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Gooch, Jan W. "Resistance Welding". In Encyclopedic Dictionary of Polymers, 625. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9964.

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Gooch, Jan W. "Seam Welding". In Encyclopedic Dictionary of Polymers, 650. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10396.

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Gooch, Jan W. "Solvent Welding". In Encyclopedic Dictionary of Polymers, 683. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10904.

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Gooch, Jan W. "Spin Welding". In Encyclopedic Dictionary of Polymers, 690. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11020.

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Gooch, Jan W. "Thermal Welding". In Encyclopedic Dictionary of Polymers, 743. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11769.

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Gooch, Jan W. "Thermoband Welding". In Encyclopedic Dictionary of Polymers, 743. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11773.

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Gooch, Jan W. "Ultrasonic Welding". In Encyclopedic Dictionary of Polymers, 779. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12307.

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Gooch, Jan W. "Plastic Welding". In Encyclopedic Dictionary of Polymers, 543. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8841.

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Gooch, Jan W. "Electromagnetic Welding". In Encyclopedic Dictionary of Polymers, 260. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_4293.

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Atti di convegni sul tema "Polymers welding"

BISWAL, AGNI K., ANKUSH NANDI, HUNG WANG e ANIRUDDH VASHISTH. "ULTRASONIC WELDING OF GLASS FIBER REINFORCED VITRIMER COMPOSITES". In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36527.

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The welding of composites has become a crucial step in the production of complex composite parts. Typically, various welding and joining techniques are used to manufacture composite assemblies. However, ultrasonic welding is one of the most popular methods for welding thermoplastic composites and cannot be used for composites with a thermosetting matrix. This study employed ultrasonic welding process for fiber-reinforced polymer composites with a dynamic covalent adaptive network (CAN). We used a thermosetting polymeric network with an associative dynamic CAN, commonly known as vitrimers; the dynamic nature of these polymers makes them reprocessable, recyclable, and reusable. These polymers can be crosslinked like thermosets but flow as thermoplastics at elevated temperatures. Thin composites were fabricated by reinforcing glass fibers into the vitrimer polymeric matrix and then welded together using ultrasonic welding. This work represents the first demonstration of welding vitrimer glass fiber-reinforced composites (vGFRC). The vGFRC matrix employed transesterification molecular exchange reactions to initiate chain mobility, leading to interlocking and rearrangement reactions on the bondline during the welding process. We evaluated the mechanical, chemical, and morphological properties of welded lap joints before and after mechanical testing. Shear strengths of 10 MPa were observed for vGFRC, indicating good weldability properties of vitrimer surfaces. The reprocessable nature of these composites was evaluated by repeated testing of lap shear strength followed by ultrasonic welding over five cycles. Additionally, we evaluated the surface functionality and atomic percentage on the fractured surface using FTIR and XPS, respectively. This exciting discovery shows that high frequency and pressure can be used to weld and reprocess polymers with dynamic molecular networks by exploiting molecular fusion and rearrangement reactions at the bondline.

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Doe, Simon, e Peter Roberts. "Transmission laser welding of polymers using laser additives". In PICALO 2006: 2nd Pacific International Conference on Laser Materials Processing, Micro, Nano and Ultrafast Fabrication. Laser Institute of America, 2006. http://dx.doi.org/10.2351/1.5056975.

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Ho, Ching-Yen, Moa-Yu Wen e Chung Ma. "Computer Simulation for Laser Welding of Thermoplastic Polymers". In 2010 Second International Conference on Computer Engineering and Applications. IEEE, 2010. http://dx.doi.org/10.1109/iccea.2010.77.

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Bachmann, Friedrich G., e Ulrich A. Russek. "Laser welding of polymers using high-power diode lasers". In High-Power Lasers and Applications, a cura di Koji Sugioka, Malcolm C. Gower, Richard F. Haglund, Jr., Alberto Pique, Frank Traeger, Jan J. Dubowski e Willem Hoving. SPIE, 2002. http://dx.doi.org/10.1117/12.470660.

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Bachmann, Friedrich G., e Ulrich A. Russek. "Laser welding of polymers using high-power diode lasers". In Laser Processing of Advanced Materials and Laser Microtechnologies, a cura di Friedrich H. Dausinger, Vitali I. Konov, Vladimir Y. Baranov e Vladislav Y. Panchenko. SPIE, 2003. http://dx.doi.org/10.1117/12.515630.

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Jansson, Anssi, Saara Kouvo, Antti Salminen e Veli Kujanpää. "The effect of parameters on laser transmission welding of polymers". In ICALEO® 2003: 22nd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2003. http://dx.doi.org/10.2351/1.5060071.

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Abed, Stephane, Wolfgang Knapp, Martin Traub, Dieter Hoffmann, Reinhart Poprawe e Peter Loosen. "Development of simultaneous laser welding process applied to thermoplastic polymers". In ICALEO® 2004: 23rd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2004. http://dx.doi.org/10.2351/1.5060279.

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Kouvo, Saara, Anssi Jansson e Antti Salminen. "Laser welding of polymers – new innovations for joining 3D geometries". In ICALEO® 2005: 24th International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2005. http://dx.doi.org/10.2351/1.5060518.

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Laakso, Petri, Saara Ruotsalainen, Tuomas Purtonen, Hannu Minkkinen, Veli Kujanpää e Antti Salminen. "Simultaneous sub second laser welding of polymers with diffractive optics". In ICALEO® 2010: 29th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2010. http://dx.doi.org/10.2351/1.5062059.

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Meng, Yuquan, Dingyu Peng, Qasim Nazir, Gowtham Kuntumalla, Manjunath C. Rajagopal, Ho Chan Chang, Hanyang Zhao et al. "Ultrasonic Welding of Soft Polymer and Metal: A Preliminary Study". In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2938.

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Abstract Joining soft polymers and metals is receiving increasing attention in both industry and academia to enable the manufacturing of innovative products. One motivation arises from the production of next-generation heat exchanges, the structure of which is primarily composed of polymers and metals. Waste heat coming from low temperature exhaust gas stream is significant in industries in the U.S. However, traditional heat exchangers that are available to recover heat in the presence of small temperature difference are large and costly, restricting the wide application of such heat exchangers. To address this challenge, a hybrid materials design is proposed to achieve a balance between thermal conductivity and mechanical strength. High quality requirement induced by the changing operating conditions necessitates a strong bonding between polymers and copper. In this research, the possibility of using ultrasonic welding, which is conventionally employed to join dissimilar or similar metal layers, is explored. Preliminary results from welding experiments and tensile shear tests reveal that two bonding modes exist in the welding of PET and copper. Furthermore, analysis of power signals collected during welding shows that one can potentially monitor and optimize welding processes using monitoring signals. It is concluded from this study that ultrasonic welding has excellent potential in joining soft polymers and metals. Future work is also discussed on the process improvement and mechanism investigation.

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Rapporti di organizzazioni sul tema "Polymers welding"

Dippold, Marcel, Makrina A. Chairopoulou, Maximilian Drexler,, Michael Scheiber e Holger Ruckdäschel. From vibrating molecules to a running shoe: connecting dielectric properties with process feedback in radio-frequency welding of TPU bead foams. Universidad de los Andes, dicembre 2024. https://doi.org/10.51573/andes.pps39.gs.pfm.1.

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Besides new material solutions, innovative processing technologies are key for working towards a more sustainable future for bead foam products. Compared to standard steam chest molding, innovative radio frequency (RF) welding shows great potential based on its direct energy input, which results in reduced energy consumption. Thus, the present study provides fundamental insights into the correlation of dielectric properties of expanded thermoplastic polyurethane (ETPU) bead foams with the processing behavior. Impedance spectroscopy is used to analyze the complex relative permittivity 𝜀𝜀!∗ of both polymer and respective beads. The dielectric properties of polymers are dictated by their molecular structure and hence resulting dipoles. Thus, significant dependency on temperature and frequency is observed due to changes in chain flexibility and therefore alignment with the oscillating electromagnetic field. As cellular structures, the introduction of a second air phase leads to generally attenuated values at equal trends. Within the RF process, changes, predominantly in the imaginary part of 𝜀𝜀!∗ from initial starting temperatures up to welding, are directly reflected in the power curve as process feedback. Furthermore, temperature evolution and derived heating rate within the bead foams demonstrate excellent conformity with previous results with minor deviations due to the thermal inertia of the fiber optic temperature sensor.

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Dave, Foram, Mahmood Ali, Mozaffar Mokhtari, Richard Sherlock, Alistair Mcllhagger e David Tormey. Effect of pigments on laser beam transmission in diode laser transmission welding of poly(propylene). Universidad de los Andes, dicembre 2024. https://doi.org/10.51573/andes.pps39.gs.pc.4.

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Welding technologies are state of the art for joining polymer composites, with one of the two joining parts considered laser transmissive (LT) and the other laser absorptive (LA). Pigments are often added to LT to enhance the crystallinity of the polymer matrix. However, pigments lead to internal scattering of the laser beam and the rate of transmission or the laser energy density decreases. Depending upon the type and amount of pigments added in the formulation of LT, the percentage of the laser beam transmitted, absorbed, or scattered differs. Laser welding performance depends on the laser energy available for welding after considering the losses. In the present study, optical transmission of injection molded isotactic polypropylene (iPP) samples were analyzed with a varying dosage of organic pigment (neat PP, 2%, 3%, 4%, 5%, 6%, 8%, and 10%) using a LPKF TMG 3 transmission tester. The device uses a wavelength of 980 nm and simulates the optical radiation conditions of diode laser transmission welding (LTW). The percentage transmission varied with the sample thickness and the composition percentage of pigment. The modified Bouguer-Lambert law described the transmission energy and apparent extinction coefficient. The model was validated with the experimental value of transmittances of the samples with varying sample thicknesses of iPP. There was a decrease in the percentage of laser transmission with an increase in the pigment content of the samples. It was found that the apparent extinction coefficient is a function of the pigment levels.

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Chambers. PR-348-09602-R01 Determine New Design and Construction Techniques for Transportation of Ethanol. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2013. http://dx.doi.org/10.55274/r0010546.

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This report summarizes results of the research study titled, �Determine New Design and Construction Techniques for Transportation of Ethanol and Ethanol/Gasoline Blends in New Pipelines� (WP #394 / DTPH56-09-T-000003). It was prepared for the United States Department of Transportation, Pipeline and Hazardous Materials Safety Administration, Office of Pipeline Safety. The technical tasks in this study included activities to characterize the impact of selected metallurgical processing and fabrication variables on ethanol stress corrosion cracking (ethanol SCC) of new pipeline steels, develop a better understanding of conditions that cause susceptibility to ethanol SCC in fuel grade ethanol (FGE) to support better monitoring and control, and develop data / insights to provide industry-recognized standards and guidelines to reduce the occurrence of ethanol SCC. This research was approached through a collaboration of Honeywell Process Solutions (Honeywell), the Edison Welding Institute (EWI), and Electricore Inc. (prime contractor) with oversight and co-funding by the Pipeline Research Council International (PRCI) and Colonial Pipeline. The program's tasks were as follows: Evaluation of Steel Microstructure Effect on Ethanol SCC Resistance Effects of Welding and Residual Stress Evaluation of Surface Treatment Effects Evaluate Effects of Pipe Manufacturing Process Specification of Polymeric Materials for New Construction Control and Monitoring of Oxygen Uptake Internal Corrosion Monitoring Standardization of SCC Test Methods Roadmap for Industry Guidelines for Safe and Reliable Pipeline Handling of FGE

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