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Microstructure and property relationships in resistance spot weld between 7114 interstitial free steel and 304 austenitic stainless steel
(2006) Hasanbasoglu, A.; Kacar, R.
Due to the differences in physical, chemical and mechanical properties of the base metals, the resistance spot welding of dissimilar materials is generally more challenging than that of similar materials. The influence of the primary welding parameters affecting the heat input such as peak current on the morphology, microhardness, and tensile shear load bearing capacity of dissimilar welds between 304 grades austenitic and 7114 grade interstitial free steel has been investigated. The optimum welding parameters producing maximum joint strength were established at a peak current of 9 kA, where the electrode force is kept 6 × 10-5 Pa and weld time is kept constant 17 cycles respectively. The primary cause of weakening the weldment is identified as the excessive grain growing region of heat affected zone (HAZ) in case of 7114 grade interstitial free steel.