激光焊接铸造镍基高温合金工艺研究

研究了铸造镍基高温合金（Ｋ３）激光焊接时工艺参数对焊缝熔深及熔宽的影响．讨论了焊缝及热影响区产生热裂纹的机制及防止措施．结果表明，采用合适的激光焊接工艺可得到有较高强度、没有裂纹和气孔等焊接缺陷的接头．

Study on Laser Welding of Cast Nickel-base Superalloy

An investigation on CO2laser welding of cast nickel-base superalloy has been carried out. The effects of the main parameters, including the laser power, the welding speed, the position of the focal point and the direction of plasma-supressing gas on the depth and width of the bead were studied. The mechanism of hot-cracking in the weld metal and the heat-affect-zone (HAZ) was investigated while the methods to reduce the cracking susceptibiliy were discussed. The results show that a defects-free joint with high tensile strength can be obtained when using ploper laser welding parameters.