Destructive tests on welds in metallic materials. Resistance welding. Pressure test on resistance seam welds

2003 ◽  
Keyword(s):  
Resistance Welding ◽  
Metallic Materials ◽  
Pressure Test ◽  
Welding Pressure

scholarly journals Analysis of void formation in thermoplastic composites during resistance welding

2016 ◽  
Vol 30 (12) ◽  
pp. 1654-1674 ◽  
Author(s):  
Huajie Shi ◽  
Irene Fernandez Villegas ◽  
Harald EN Bersee
Keyword(s):  
Void Formation ◽  
Resistance Welding ◽  
Thermoplastic Composites ◽  
Stress Distributions ◽  
Uniform Temperature ◽  
Residual Moisture ◽  
Welding Temperature ◽  
Void Distribution ◽  
Temperature And Pressure ◽  
Welding Pressure

The process-induced voids during resistance welding of glass fabric-reinforced polyetherimide was investigated. The mechanisms of void formation in adherends, in particular, the residual volatile-induced voids and the fibre de-compaction-induced voids, were analysed. Due to the non-uniform temperature and stress distributions in the joints during welding, a non-uniform void distribution was observed in the joints with more voids generated in the middle of the joints than at the edges. Welding temperature and pressure were shown to have a large influence on void formation. Increasing of welding pressure was shown to effectively reduce the voids, while the residual moisture-induced voids were found more difficult to be eliminated than the fibre de-compaction-induced voids.

Materials science and technology of metallic, non-metallic and composite materials:the technology of manufacturing blanks and parts. Book 2

2021 ◽  
Author(s):  
Anatoliy Adaskin ◽  
Aleksandr Krasnovskiy ◽  
Tat'yana Tarasova
Keyword(s):  
Composite Materials ◽  
Graduate Students ◽  
Materials Science ◽  
Machine Building ◽  
Federal State ◽  
Metallic Materials ◽  
Educational Standards ◽  
Metal Materials ◽  
State Educational ◽  
Welding Pressure

Book 2 presents the technologies for manufacturing blanks and parts from metal materials: casting, welding, pressure treatment and cutting. The basics of electroplating technology are given. The technologies of manufacturing parts from non-metallic materials are considered: plastics, rubber, glass, as well as composite materials. The technologies combining the production of composite materials and parts from them are shown. The textbook is supplemented with two chapters reflecting the trends in the development of technology and technology (chapter 28 " Nanostructured materials. Features. Technologies for obtaining. Areas of application", chapter 29 "Additive manufacturing"). Meets the requirements of the federal state educational standards of higher education of the latest generation. For bachelors and undergraduates studying in enlarged groups of training areas 15.00.00 "Mechanical Engineering" and 22.00.00 "Materials Technologies". It can be used for training graduate students of machine-building specialties, as well as for advanced training of engineering and technical workers of machine-building enterprises.

Twist Compression Welding of Aluminum

2019 ◽  
Author(s):  
T. Yokota ◽  
T. Hashimoto ◽  
M. Otsuka ◽  
M. Nobutoki ◽  
T. Ueki
Keyword(s):  
Surface Roughness ◽  
Oxide Film ◽  
Film Thickness ◽  
Joint Strength ◽  
Twist Angle ◽  
Diffusion Welding ◽  
Surface Films ◽  
Metallic Materials ◽  
The Stability ◽  
Welding Pressure

Diffusion welding of metallic materials requires contact of clean surfaces by removing surface films. However, there is microscopic unevenness on the surfaces and they are covered with oxide layers, absorbed gas layers, contaminating substance layers, etc. Welding is prevented by this unevenness and by these surface films and it is the stability of the surface films, in particular, which affects welding. Aluminium is regarded as a particularly difficult material for diffusion welding since it has a highly stable strong oxide film. Hence, to weld aluminium, it is necessary to remove this stable film so that welding can be performed. This article describes will describe the result of the investigation into the effect of twist angle, welding pressure and temperature, film thickness and surface roughness on the joint strength of the material.

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