Deformation behaviour of welded stainless steel – carbon steel sandwich sheet material

 

Endre Romhanji,

Vencislav Grabulov,

 

Formability of welded austenitic stainless steel (321 type) – low carbon steel (1010 type) sandwich sheet material was tested. Gas tungsten arc welding (GTAW) and shield metal arc welding (SMAW) procedures were used. After applying the GTAW welding process the weld metal hardness was found considerably higher than after using the SMAW process, due to a higher consumable fraction in case of the GTAW welding procedure. The bendability of the tested weldments appeared to be satisfying, but the biaxial stretchability of the welded sandwich sheets was considerably lower compared to the base material (33% - 45% degradation). The stretchability degradation brought by welding was found the lowest in the samples welded by the lowest heat energy input. The strain distribution after equibiaxial stretching of the welded sheets was very inhomogeneous due to different hardening abilities of the base and weld metal.

Key words: stainless steel, carbon steel, sandwich sheet, welding, weldment, deformation, test results.