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resistance welding of glass fiber reinforced thermoplastic composite:Experimental investigation and process parameter optimization

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Chinese Journal of Aeronautics 2020年第12期33卷 3469-3478页

作者： Bing DU Liming CHEN Houchang LIU Qinghao HE Weiming QIN Weiguo LI College of Aerospace Engineering Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Heterogeneous Material Mechanics Chongqing UniversityChongqing 400030China Chongqing Key Laboratory of Nano–Micro Composite Materials and Devices School of Metallurgy and Materials EngineeringChongqing University of Science and TechnologyChongqing 401331China Centre for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneyNSW 2006Australia

The utilization of fiber reinforced thermoplastics(FRTP)is expected to fulfill lightweight demand in mass-produced aerospace products.Facing the unavoidable assembly of FRTP parts,fusion bonding methods such as resistance welding are promising compared with mechanical joint and adhesive bonding.In this paper,a procedure has been brought out to understand the relationship between processing conditions and performance of the FRTP welding joints.The adherends were continuous glass fiber reinforced polypropylene(GF/PP)laminates fabricated by hotpressing method.The influences of time,current and pressure on the bending strength of the resistance welding joints were investigated.A processing window was drawn based on the optical observation of welded surfaces.The quantitative relationship between process parameters and mechanical property of GF/PP welding joint was established by Response Surface Method(RSM)with high accuracy.It was found that bending strength of GF/PP welding joint was improved by 31%compared with hot-pressing benchmark.

关键词： Mechanical property Processing parameters resistance welding Response Surface Method Thermoplastic

resistance welding of carbon fibre reinforced polyetheretherketone composites using metal mesh and PEI film

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China welding 2004年第1期13卷 71-75页

作者：闫久春王晓林秦明赵新英杨士勤 State Key Laboratory of Advanced welding Production Technology Harbin Institute of Technology National Key Laboratory of Advanced Composites Beijing Institute of Aeronautical Materials

Weldability of polyetheretherketone(PEEK) with polyetherimide(PEI) is tested. And carbon fiber reinforced PEEK laminates are resistance welded using stainless steel mesh heating element. The effects of the welding time and welding pressure on the lap shear strength of joints are investigated. Results show that PEEK can heal with PEI well in welding condition and the lap shear strength of PEEK/CF(carbon fibre) joint increases linearly with welding time, but reaches a maximum value when welding pressure ranging from 0.3 MPa to 0.5 MPa with constant welding time. The fracture characteristics of surface are analyzed by SEM techniques, and four types of fracture modes of lap shear joints are suggested.

关键词： resistance welding carbon fiber reinforced polyetheretherketone composite welding parameter fracture

Characterization of electrical properties of resistance welding machines

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China welding 2008年第3期17卷 24-29页

作者：武佩邵颖丽 WenqiZhang NielsBay School of Mechanical and Electrical Engineering Inner Mongolia Agricultural University Huhhot 010018 SWANTEC Software and Engineering ApS Hoersholm DK-2970 Denmark Department of Manufacturing Engineering and Management Technical University ot Denmark Lyngby DK-2800 Denmark.

Due to the individual electrical and mechanical characteristics of resistance welding machines, choice of the right machine and welding parameters for an optimized production is often difficult. This is especially the case in projection welding of complex joints. In this paper, a new approach of characterizing the electrical properties of AC resistance welding machines is presented, involving testing and mathematical modelling of the weld current, the firing angle and the conduction angle of silicon controlled rectifiers with the aid of a series of proof resistances. The model predicts the weld current and the conduction angle （or heat setting） at each set current, when the workpiece resistance is given.

关键词： resistance welding electrical properties weld current conduction angle

The Electrical Contact resistance in resistance welding evaluated by Gleeble testing machine

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The Electrical Contact Resistance in Resistance Welding eval...

A Hybrid Joining Technology for Aluminum/Zinc Coated Steels in Vehicles

第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Zhou Weimin Joint Laboratory for Gleeble Physical Simulation on Materials Research School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

Electrical contact resistance is an important parameter in resistance welding. In this article, a Gleeble 3500 thermal-mechanical testing machine was employed to measure the contact resistance. The machine is equipped with a special electrical resistance measuring system. The contact resistance is experimentally investigated for welding low carbon steel to themselves. A detailed work was carried out to investigate the influence of pressure, temperature on the contact resistance of low carbon steel. The experimental results show that the contact resistance decreases when pressure or temperature increases.

关键词： resistance welding electrical resistance physical simulation systems thermal-mechanical testing machine

来源： cnki会议评论

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Journal of Materials Science & Technology 2010年第9期26卷 858-864页

作者： C.Y.Choi D.C.Kim D.G.Nam Y.D.Kim Y.D.Park School of Materials Science and Engineering Pusan National UniversityBusan Advanced welding & Joining R&D Division Institute of Industrial Technology Incheon Dongnam Technology Service Division Korea Institute of Industrial TechnologyBusan Department of Advanced Materials Engineering Dong-Eui UniversityBusan

Currently,in the automotive industry,joining of the aluminum alloys with the steel is a crucial problem to be solved.Conventional joining techniques including resistance spot and gas metal arc welding are not acceptable for those applications due to a number of metallurgical problems.The investigation was carried out to develop the hybrid joining process combining the resistance spot welding and brazing.In this study,an attempt was made to apply hybrid process to the joining of dissimilar sheet metals,Al-Mg-Si（6000 series） alloy and low carbon steel sheet.Hybrid process（resistance spot weld/brazing） using filler metal was found to be effective to overcome the incompatibility between aluminum alloy and steel.Although hybrid joining process of Al alloy sheet and steel sheet did not produce acceptable bond strength,it was proved to have reasonable interfacial bond layer if the optimal process condition was applied.

关键词： Hybrid joining Aluminum alloy Steel resistance welding Brazing

EXPERIMENTAL AND SIMULATED COMPRESSIVE PROPERTIES OF WORK-HARDENED X-TYPE LATTICE TRUSS STRUCTURES

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Acta Mechanica Solida Sinica 2012年第2期25卷 111-116页

作者： Qiancheng Zhang Tianjian Lu MOE Key Laboratory of Strength&Vibration School of AerospaceXi'an Jiaotong UniuersityXi'an 710049China

The expanded metal sheets were folded with 11% work-hardening. These were sub- sequently used with resistance welding to construct X-type lattice truss sandwich panels having a core relative density of 0.17. The sandwich panels were tested in uniaxial compression and, for comparison, the method of finite elements was employed to simulate the measured compressive stress-strain curves. The peak compressive strength was 32% higher than that of pyramidal core sandwiches. The enhanced mechanical properties of the work-hardened X-Type lattice structures mainly originate from the contribution of straight struts with low degree of curvature and work hardening, rather than the two-dimensional staggered nodes.

关键词： sandwichs work hardening resistance welding X-type core

Theoretical Conjecture of Pin-hole Defect of Weldable Vibration Damping Steel Sheet and Responsive Validated Therapy

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Theoretical Conjecture of Pin-hole Defect of Weldable Vibrat...