A Novel Preweld Laser Surface Treatment for Enhanced Intergranular Corrosion Resistance of Austenitic Stainless Steel Weldments

作者：Kaul R^*; Parvathavarthini N; Ganesh P; Mulki S V; Samajdar I; Dayal R K; Kukreja L M

来源：Welding Journal, 2009, 88(12): 233S-242S.

• Laser Welding
• Surface Treatment
• Stainless Steel
• Heat-Affected Zone
• Sensitization
• Intergranular Corrosion
• Grain Boundary

This paper describes the development of a new prewelding laser surface melting treatment scheme to Suppress sensitization in the heat-affected zone of gas tungsten arc weldment of Type 304 stainless steel. The results of the present study, performed on 6-mm-thick medium-carbon (0.044 wt-%) and 10-mm-thick high-carbon (0.1 wt-%) Type 304 stainless steel sheets, established that surface modification engineered by CO(2) laser treatment is highly effective in suppressing heat-affected zone sensitization during subsequent gas tungsten arc welding. Laser surface treated heat-affected zone of gas tungsten are weldment exhibited a significantly lower degree of sensitization and susceptibility to intergranular corrosion than those of untreated heat-affected zone. This is attributed to higher fraction of Sigma 1 subgrain boundaries introduced by laser-assisted melting and resolidification.

• 出版日期2009-12