Effect of Prior Deformation on Welding Microstructure of Steel 304L

• Published in: Cai liao gong cheng = Journal of materials engineering Vol. 45; no. 1; pp. 7 - 13
• Main Authors: Wu, Luo-fei, Cheng, Qiang, Li, Zhu-guo
• Format: Journal Article
• Language: Chinese
• Published: Journal of Materials Engineering 20.01.2017
• Subjects: Austenitic stainless steels; Deformation; Electric potential; metal active-gas; Microstructure; prior deformation; Tee joints; Welded joints; Welding; Welding parameters; welding process
• ISSN: 1001-4381; 1001-4381
• DOI: 10.11868/j.issn.1001-4381.2015.000051

This subject was raised by an automotive company.Based on the welding design on the curved surface,the effect of prior deformation on the weld structure was studied.Metal active-gas welding was used on the T-joint and pre-deformed plates of austenitic stainless steel 304L to find the proper welding parameters and observe the effect of prior deformation on the microstructure.The proper parameters acquired are:the speed of the torch is 4mm/s,the speed of delivery of welding wire is 2.5m/min and the voltage is 17V.In the T-joint and pre-deformed joint,the weld toes are in the zone with strain of 0% and 30%.In the pre-deformed welding specimen,it was observed that the fusion zone and partially melted zone are narrowed,carbide precipitation and ferrites are found less.In all,the microstructure in the pre-deformed weld joints on 304L is more uniform.