TENG Bin, PAN Shijian, JIANG Bao, et al.Comparison of Microstructure and Mechanical Properties BetweenLaser Welding and TIG Welding of GH536 Alloy[J].Electric Welding Machine, 2022, 52(5): 106-111. DOI： 10.7512/j.issn.1001-2303.2022.05.15.
Comparison of Microstructure and Mechanical Properties Between Laser Welding and TIG Welding of GH536 Alloy
In order to discuss the feasibility of the laser welding replacing the TIG welding, a 3mm thick GH536 superalloy was welded by these two welding methods. The microstructure, room and high temperature tensile properties, endurance properties and fatigue properties of these two kinds of joints were compared and analyzed. The results show that the one side welding both sides forming of a 3mm thick GH536 alloy can be achieved by laser welding. The laser welding can not only reduce the heat input but also increase the welding speed by five times compared with that of the TIG welding. The average tensile strengths of laser welded joints at room temperature and 1 000 ℃ is 740 MPa and 77 MPa, respectively. The endurance life of the two joints are similar, and can reach 75% of the base metal. However, the fatigue performance of the laser welded joint is better under the same condition, and the fatigue cycle time of the laser welded joint is more than twice than that of the TIG welded joint. Because of the lower heat input, the microstructure of the laser welded joint is more uniform and the grain is finer, which are the main reasons for the better fatigue property. It is indicated that the laser welding can replace the TIG welding for the 3 mm GH536 superalloy.
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