PURPOSE: To improve the low temperature toughness while the corrosion resistance is secured by the simple heat treatment for a large sized welded structure hard to execute the solution heat treatment in a multi-layer weld zone of the austenitic stainless steel.

CONSTITUTION: In the two-electrode gas shielded arc welding method of the austenitic stainless steel, the weld bead formed by a preceding electrode is heated up to 900-1200°C by the heat generated by a succeeding electrode, and the heated state is kept for 0.5-3 seconds to realize the austenitic transformation.