Abstract
Filler metal addition has been investigated as an effective way to enhance mechanical properties of cold rolled mild steel in resistance spot welding. In the present study, filler metal from 30 to 80 mg was added to the spot weld to study its effect on mechanical behaviour of spot weldments. The composition of the filler metal added was same as that of base metal. Effects of the filler metal and its quantity on failure mode was discussed on 1.5- mm-thick CRM steel for the first time. Concerning the practical application, sensitivity of the filler metal addition to spot weldments to variation in welding current and preheating were experimentally investigated. From results, it can be concluded that the addition of filler metal have increased breaking strength of the weldment in given weld cycle. Due to additional availability of filler metal during spot welding, the breaking strength was 7.029% higher with 30 mg of filler metal. Moreover, the diameter of the weld nugget was found to be increasing due to the addition of filler metal. With the addition of filler metal, weld tensile strength, ductility, and fracture modes were all improved. Predominant mode of failure with filler metal was found to be button pull out.
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