Dissimilar Joint Properties of Cu to 304 Stainless Steel by GTAW Process

Document Type : Original Articles

Authors

• Omid Tavakkoli Dehaghi
• Mahdi Rafiei

Najafabad Branch, Islamic Azad University

10.22067/ma.v30i2.58138

Abstract

In this research, the microstructure and properties of dissimilar joint of pure Cu to 304 stainless steel by GTAW process, were studied. For this purpose, the welded specimens with Inconel 625 and 309L stainless steel filler metals, were prepared. Then, the microstructure and mechanical properties of these specimens were investigated by optical microscopy, tension and microhardness tests. In welding with ERNiCrMo3 filler metal, solidification crack was seen in the weld metal while in welding with ER309L filler metal, the austenitic microstructure was without any crack.  Also, in welding with ER309L filler metal, the fracture occurred in HAZ of Cu base metal. Based on the results of tests, the ER309L filler metal was proposed for the welding of pure Cu to 304 stainless steel.      

Keywords

• Dissimilar Welding
• Inconel 625
• GTAW

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