Effect of Electrode Force Change on Spot Weld Quality of AHSS Using Servo Gun

Abstract

Due to bad welds including small button, weld expulsion, and weld whisker etc., it is studied that the effect of constant and variable electrode force with servo gun on the weld quality of high strength steels with different thickness and materials. The results show that the electrode force plays an important role in resistance spot welding of AHSS as well as that of mild steels. Under the same welding current and time, better welds with higher tensile shear strength and larger nugget size can be obtained by optimizing electrode force curve using servo gun. The solutions could supply reference to study the prospect of servo gun in the joining of high strength steels.

Connection Status Research of the Resistance Spot Welding Joint Based on a Rectangular Terminal Electrode

“…Therefore, by adopting a rectangular terminal electrode, the electrode adhesion and splashing can be effectively reduced, and the connection strength of RSW joint can be increased. However, the welding current [11][12][13], pressure [14], time [15,16], and other parameters [17][18][19][20][21] in the RSW process have significant influence on the nugget dimensions and metallographic morphology of RSW joints. Compared with the traditional electrode, the distribution of welding current and welding pressure in the rectangular terminal electrode is much more complicated [22], which means that the welding parameters have more obvious influence on the nugget dimensions and metallographic morphology.…”