Comparison of joint performance between weld-bonding and resistance spot welding of dual-phase steel

The joint performances between weld-bonding and resistance spot welding(RSW) are compared by tensile-shear force of nuggets,microstructure of nuggets,dynamic resistance curves and weld lobes.Experimental results show that the tensile-shear force of weld-bonded nuggets is much higher than that of spot-welded nuggets when lower welding current is used;oppositely tensile-shear force of spot-welded nuggets is a little higher than that of weld-bonded nuggets when higher welding current is used,but severe spatter will occur.Therefore,lower welding current in weld-bonding of steel comparing with that of RSW and larger electrode force during welding will inhibit spatter.