湛江发电厂1^#汽轮机高中压外缸中分面的堆焊工艺

Surfacing Welding Technology of Flange Joint Surface of High and Mediate Pressure Outer Casing for Turbine

湛江发电厂在1999年1#机组大修中采用堆焊密封带方法修理了汽轮机高中压外缸中分面的变形缺陷。修理前,围绕兼顾解决焊接性、应力和变形问题,结合实际施工条件制定了以手工钨极氩弧焊、镍基焊丝、焊前低温预热、焊后锤击焊缝为要素的冷堆焊工艺。工艺实施后获得了预期的效果。

The method of surfacing welding sealing strip was adopted to repair the deformation of the flange joint surface of the high and intermediate pressure outer easing. Before repairing, basing on the actual working condition, concerning the weldability, stress and deformation issues, the scheme of the cold welding technology whose, essential being GTAW, low temperature preheating, postweld hammer the welded seam was established. Prospective effect was attained after implementing the scheme.