1. School of Materials Science and Engineering，Southwest Petroleum University， Chengdu 610500，Sichuan，China 2. Engineering Training Center，Southwest Petroleum University，Chengdu 610500，Sichuan，China
Abstract：316L/X65 bimetal clad pipe was welded by GTAW and SMAW. The microstructure， chemical composition， mechanical properties and electrochemical corrosion behavior of welding joints were investigated by OM， EDS， SEM， hardness test， tensile test， impact test and electrochemical test. The results show that the chemical composition of transition welding seam is little diluted， and elemental migration appears near the fusion line of transition weld seam. Welding seam and base material have the same chemical composition in stainless steel layer. The microstructure of transition layer is characterized by the martensite-like and retained austenite； the transition layer and stainless steel layer contain austenite and a little ferrite. The defect free joint is produced and performed well under the experimental parameters. The difference of electrochemical corrosion properties between weld seam and base material in stainless steel layer is very little.
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2016, Vol. 51 
