Influence of Welding Technology on Strain Strengthening Properties of Austenitic Stainless Steel Welded Joints

Plasma welding, submerged arc welding and gas shielded arc welding were used to weld domestic 304 stainless steel plates with different thicknesses. The influences of welding technology on strain strengthening properties of austenitic stainless steel joints were investigated through changes of mechanical properties and microstructures of welding joints by three welding methods before and after strain strengthening. Results show that after being strain strengthened the yield strength of the plates and three welded joints increased, other properties of plates and plasma welded joints were not affected, while the ductility of submerged arc welded joint and gas shielded arc welded joint deteriorated. And the low temperature impact toughness of the welded joints varied in some amplitude. Martensite was not be found. Weld reinforcement and repair had no effect on strain strengthening properties of gas shielded arc welded joints.