Microstructural characteristics and mechanical properties of underwater wet flux-cored wire welded 316L stainless steel joints

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• 作者：H.L. Li^a ; D. Liu^a ; ^b ; ^{liuduo0376@163.com" class="auth_mail" title="E-mail the corresponding author} ; Y.T. Yan^b ; N. Guo^a ; ^b ; J.C. Feng^a ; ^b
• 关键词：316L austenitic stainless steel ; Underwater wet welding ; Flux-cored wire ; Microstructure ; Mechanical properties
• 刊名：Journal of Materials Processing Technology
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：238
• 期：Complete
• 页码：423-430
• 全文大小：3724 K

文摘

Underwater wet welding of 316L stainless steel was performed with specially designed nickel-based tubular wire at shallow water. Microstructural observations showed that fully austenitic weld metal without cracks and pores was achieved by the nickel-base filler materials. The ultimate tensile strength of welded joints was 508 MPa and the average elongation of the joints was up to 32%. The impact test results indicated that all specimens exhibited ductile fracture and Charpy impact toughness value of weld metal at 0 °C was 159 J/cm². The average hardness of weld metal was 156 HV. There was a sharp increase of hardness occurred in fusion zone due to more ferrite formation.