Effets des paramètres du soudage sur la résistance en traction-cisaillement de différents aciers inoxydables soudés par points

The effect of welding parameters on the tensile-shear resistance in the different spot welded stainless steels

¹ Dr.-ing., Université de Kocaeli, Turquie
² Prof. Dr.-ing., Université de Kocaeli, Turquie
³ Prof., Université Technique d’Istanbul, Turquie

Abstract

Nowadays, joining the ferritic and austenitic types of stainless steels by means of electric resistance spot welding is of great importance in the field of chemistry, food, automotive industry and aeronautics. Furthermore, it is also known that in the American automotive industry and in the production of wagons and automobiles in Europa, especially in Sweden and Germany, the use of stainless steel sheets have been increasing. In this investigation, test material of 1 mm thick sheet of ferritic and austenitic stainless steels were used. 1 × 30 × 100 mm test pieces have been prepared from stainless steel sheets. Welding times were changed as 5, 15 and 25 periods. Squeezing and holding times were constant and given as 25 periods. Welding current was controlled from 4,5 kA to 13,5 kA by increments of 1 kA. For each case, at least six joints of pieces were welded. With the respect to development of the experiment, first ferritic and ferritic stainless steel joints, then austenitic and austenitic stainless steel joints were welded. Finally, ferritic and austenitic stainless steel sheets were welded using the same parameters. The electrode power was controlled at a constant 500 daN and then tensile-shear test was applied to all specimens. In this research, the suitable spot welding parameters were determined. The tensile-shear force of the joint of ferritic and austenitic stainless steel pair is said to be medium compared with the tensile-shear force of only the ferritic or only the austenitic stainless steel.