In the present study, galvanized High Strength Interstitial Free (HIF) steel sheets, and Dual Phase (DP780) steel sheets were used for the investigations. Resistance spot weld joints were fabricated between dissimilar steel sheets. The variation in dynamic resistance (DR) with the change in welding process parameters such as weld current, weld time and electrode force were used for establishing the range of adequate weld nugget formation parameters. Effect of these parameters over tensile strength, nugget diameter and the observed failure mode was studied using one factor at a time (OFAT) approach. Microstructure and hardness of parent metal, fusion & HAZ region has also been studied.

在本研究中，镀锌高强度无间隙（HIF）钢板和双相（DP780）钢板用于研究。在不同的钢板之间制造了电阻点焊接头。动态电阻（DR）随焊接工艺参数（例如焊接电流，焊接时间和电极力）的变化而变化，以建立适当的焊点熔核形成参数范围。使用一次一次因素（OFAT）方法研究了这些参数对拉伸强度，熔核直径和观察到的破坏模式的影响。还研究了母体金属，熔合和热影响区的组织和硬度。