GH3044高温合金激光熔覆焊接工艺研究

为解决航空发动机高导内机匣裂纹修复问题,采用RRW3040型激光熔覆设备对1.5mm厚的高温合金GH3044进行有间隙对接焊接,对焊接坡口间隙、激光功率、焊接速度三因素进行正交试验,得到的最佳工艺参数为间隙0.5mm、功率600W、焊接速度0.011m/s。对焊接接头进行拉伸强度测试、硬度检测、金相检查、抗弯曲测试。测试结果表明,在最佳工艺参数条件下,可得到熔合良好,无裂纹、较大气孔、夹杂等缺陷的焊接接头,接头拉伸强度平均值可达752MPa,且焊缝区域硬度和热影响区硬度相对于基体硬度的波动值范围均小于10%,焊缝区域保持了良好的塑性。

A Study on Laser Cladding Welding Process of GH3044 Superalloy

In order to solve the crack repair problem of aeroengine’s high conductivity inner casing,the gap butt welding of 1.5 mm thick superalloy GH3044 was carried out with RRW3040 laser cladding equipment.The orthogonal experiment was conducted on the three factors of welding groove gap,laser power and welding speed.The optimal process parameters were obtained as follows:gap 0.5 mm,power 600 W,and welding speed 0.011m/s.Tensile strength test,hardness test,metallographic examination and bending resistance test were carried out on the welded joint.The results test show that under the optimal process parameters,the welded joint with good fusion and without cracks,large pores,inclusions and other defects can be obtained.The average tensile strength of the joint can reach 752MPa,and the fluctuation range of hardness in the weld area and the heat affected zone relative to the matrix hardness is less than 10%.And good plasticity is maintained in the weld area.