SA-299厚壁锅筒下降管管座裂纹现场焊补热处理工艺实践

The process practice of heat processing for the on-the-spot welding repair of the crack of pipe seat of the down pipe of SA-299 boiler with thick wall

我厂1#～4#机组的锅炉由北京巴威公司制造,锅炉锅筒选用SA-299钢。该钢为中碳锰硅钢,Ceq可达0.57,化学成分如图1所示,在焊接过程中有淬硬和冷裂倾向,但对再热裂纹不敏感,焊接性一般。