Study on the microstructures and properties of AA-TIG welding joint of 2.25Cr1Mo0.25V heat-resistant steel and 304 stainless steel
The dissimilar steels of 2.25Cr1Mo0.25V heat-resistant steel and 304 stainless steel pipe were weld-ed by arc-assisted active AA-TIG welding,and the microstructure,hardness and mechanical properties of the welded joints were analyzed.The results show that the AA-TIG welding can weld through 2.25Cr1Mo0.25V heat-resistant steel and 304 stainless steel at one time,and get a well-formed welding joint.There are no welding defects such as cracks at the weld seam,and all elements at the weld seam are evenly distributed in the horizontal direction of the weld seam.In the weld zone near the base metal on both sides,there is a certain gradient of Cr,Fe,and Ni elements,but there is no obvious segregation.The hardness values of the base metal areas on both sides of the welded joint are relatively low,reaching their maximum in the weld area.The hardness fluctuation range in the weld area is between 400 and 489 HV,and the final tensile specimens are all broken on the 304 base metal.The average tensile strength obtained is 406 MPa,and the maximum tensile strength is 542 MPa.
arc-assisted active AA-Tig weldingmicrostructuremechanical properties2.25Cr1Mo0.25V heat resistant steel304 stainless steel
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