Electric resistance welding

About: Electric resistance welding is a research topic. Over the lifetime, 16761 publications have been published within this topic receiving 154851 citations.

Low expansion laser welding arrangement

Abstract: An arrangement for laser beam welding wherein at least one of the components being welded is formed of a material which is substantially transparent to radiation at the wavelength of the laser welding beam. A layer of welding material is placed over the surface area of the weld joint, and is a type of material which is substantially absorbent of radiation at the wavelength of the laser welding beam. The welding material is then irradiated by the laser beam through the component which is substantially transparent thereto for a sufficient period of time to cause melting of the welding material and fusion thereof to the two components being welded. The present invention has particular applicability to welding with a Nd-YAG laser of components formed of silica-containing material, such as fused silica or titanium silicate, and wherein the welding material placed at the weld surface area is a titanium based material. The present invention is also particularly attractive for weld locations which are physically inaccessible to direct irradiation, but can be irradiated through the material which is substantially transparent to the laser welding beam.

Review of resistance spot welding of steel sheets Part 2 Factors influencing electrode life

Abstract: The factors influencing the formation and growth of the weld nugget in resistance spot welding have been highlighted in Part 1 of this review. While various techniques based on theoretically derived models have been used for the control of weld growth, very few have found widespread application in any production control philosophy. The application of artificial intelligence techniques has proved only partially successful in overcoming the problems encountered. A limiting factor in manufacturing using spot welding is the life of the welding electrodes. A short life necessitates frequent electrode dressing or changing, resulting in lower production rates and higher costs. Also, weld quality is more variable towards the end of the life of an electrode, particularly when welding coated steels. Electrode deterioration causes growth of the electrode tip diameter, which has been shown to be dominant in determining the deterioration in weld quality in production operations. The process of electrode wear h...

A perspective on residual stresses in welding

Abstract: Welding induced residual stress occurs due to non-uniform simultaneous heating and cooling, local variation in shrinkage because of variable cooling rates in different regions of the weld, and strains associated with metallurgical phase transformations. The residual stress in a welded joint can augment the externally applied load and cause structural failure. Prediction and mitigation of residual stresses still remain important issues in welding. The purpose of this special issue of Science and Technology of Welding and Joining is to present recent research on calculation, measurement and alleviation of residual stresses in welding.

Method and apparatus for feeding welding wire

Abstract: A welding wire feeding system feeds welding wire from a barrel to a welding gun. The system includes a feed mechanism for drawing welding wire from the barrel and advancing the welding wire toward the welding gun. A free-wheeling wheel is disposed between the barrel and the feed mechanism and is freely rotatable about an axis. The welding wire is wound around the wheel, whereby a curvature is imparted to an otherwise-straight welding wire. Also, any twists generated in the welding wire at the welding gun will be stopped at the wheel before reaching and fouling the barrel.