Weldability Study of Resistance Spot Welds and Minimum Weld Button Size Methodology Development for DP Steel 2004-01-0169
Weldability is one of the manufacturing concerns for the application of newly developed advanced high strength steels, which have tensile strengths above 440 MPa. The successful utilization of advanced high strength steels depends on not only the steel product development, but also car body and structure design consideration and optimization.
The resistance spot weldabilities of five different material combinations, DP500EG/CRS to DP500EG/CRS, DP500EG to Mild EG, and Mild EG/CRS to Mild EG/CRS, were investigated in this study. An optimized welding schedule was established for each material combination. In addition, a methodology to determine the minimum button size was proposed to accommodate the existing commercial practice in the resistance spot welding specifications. A brief review with simple failure mode estimation formulas of standard tensile shear and cross tension tests was also introduced and discussed to aid AHSS applications.