The AD700 project was launched in 1998 with the goal of establishing a demonstration power station with steam parameters of 700℃/720℃/35 MPa and a unit efficiency of more than 50%. The United States and Japan also carried out research on the A-USC project in 2001 and 2008. 1-2] 617 Nickel-based alloy is a Cr-Co-Mo type nickel-based high-temperature alloy mainly based on solid solution strengthening. Due to its high creep strength and superior high-temperature oxidation resistance, 617 alloy was selected as a candidate material for boiler superheaters/reheaters, pipes and headers in the AUSC project (3-4]. In practical applications , the assembly of generator set components requires appropriate connection technology. Welding is widely used as an efficient and stable metal connection method. However, during the welding process, the welding heat will affect the assembly of the welded joints.