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Microstructure and mechanical properties of L415/N08825 bimetallic composite pipe welded joint using GTAW + SMAW

Wang Liang, Wu Deng, Xu Ming, Hu Yiwen, Zhou Peishan

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 1

art. no. e18, 2023

The L415/N08825 bimetallic composite pipe welded joint was produced by gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW) using nickel superalloy Inconel 6625 filler. The dendritic austenite grows in the direction perpendicular to the fusion line in the weld metal. The main elements, such as Cr, Ni, Mo and Fe show a large concentration gradient in the interface of the HAZ and weld metal. The unmixed zone in the three-phase zone is because of the differences in thermo-physics properties. The yield strength and tensile strength are 432 and 582 MPa, respectively. The interface between the cladding layer and the base layer fracture first, then the cladding layer, and the base layer finally. Compared with the impact toughness of the weld metal, the HAZ has a better impact toughness. Moreover, the average hardness of the weld is higher than that of the base metal and the HAZ. After welding, the HAZ is softened, and the hardness of the fusion line is higher than that of the base metal. The mechanical properties of the welded joint meet the standard requirements and it is advisable to use the GTAW + SMAW process for the welding of L415/N08825 bimetallic composite pipe.