Effect Of Cooling Rate On Mechanical Properties In Resistant Welding Joint Of AISI 304 Stainless Steel

Abstract

AISI 304 stainless steel plates are widespreadly used in automotive, food and chemical industries. These materials are joined by resistant spot welding. Mechanical properties of resistant spot-welded sheets are changed by using different cooling conditions after welding process. In this study, the effects of current intensity and cooling conditions during spot welding of AISI 304 stainless steel on mechanical properties and microstructure of the welded joint were investigated. Tensile-shear tests and hardness tests of joints welded at different current intensities and cooling rates were carried out. Morphology and microstructure of nucleus zone were examined. Suitable joining properties were provided by using 7.5 kA of welding current and cooling with air. Although the tensile-shear strength of the joints increased with increasing current intensity, the joint has been over-deformed and has come to a point of gushing.

Keywords

• food and chemical industries. These materials are joined by resistant spot welding. Mechanical properties of resistant spot-welded sheets are changed by using different cooling conditions after welding process. In this study
• the effects of current intensity and cooling conditions during spot welding of AISI 304 stainless steel on mechanical properties and microstructure of the welded joint were investigated. Tensile-shear tests and hardness tests of joints welded at different current intensities and cooling rates were carried out. Morphology and microstructure of nucleus zone were examined. Suitable joining properties were provided by using 7.5 kA of welding current and cooling with air. Although the tensile-shear strength of the joints increased with increasing current intensity
• Stainless Steel
• Resistant Welding
• Cooling Rate
• Mechanical Properties
• Microstructure Properties