Study on A-TIG welding of Q245R/321 dissimilar steel

Abstract

This paper mainly studies the welding of stainless steel 321 and carbon steel Q245R dissimilar steel. Welding tests of stainless steel 321 and carbon steel Q245R are carried out by A-TIG welding method. The effect of active agent on weld penetration, weld formation and inner hole slag inclusion is studied. The mechanical properties of welded joints is measured by tensile and bending mechanics tests, and the macroscopic and microscopic structures are observed. Furthermore, these tests and research results are compared with conventional TIG welding. The results show that the welding of dissimilar steel with A-TIG welding method is well formed, and there are no pores, cracks and slag inclusion in the weld. The weld microstructure of the two welding methods is mainly austenite and ferrite. In the Q245R side heat affected zone (HAZ), the migration of carbon elements is obvious, but the A-TIG welding joint is superior to the conventional TIG welding in strength and toughness.

A Review on Fusion Welding of Dissimilar Ferritic / Austenitic Steels: Processing and Weld Metallurgy

“…The TIG process activated by a fusible flux (A-TIG) was successfully experimented by Zhang et al [23] for welding Q245R mild steel to AISI 321 austenitic stainless steel. The surface of the metals to be welded was coated by a thin layer of flux, consisting of a mixture of oxides, which, by capturing electrons, improves the arc performance.…”

A Review on Fusion Welding of Dissimilar Ferritic/Austenitic Steels: Processing and Weld Zone Metallurgy

“…The TIG process activated by a fusible flux (A-TIG) was successfully investigated by Zhang et al [23] for welding Q245R mild steel to AISI 321 austenitic stainless steel. The surfaces of the metals to be welded were coated by a thin layer of flux, consisting of a mixture of oxides, which, by capturing electrons, improves the arc performance.…”