关键词: 异种钢材, 湿法水下焊接, 水下高压干式焊接, 局部干法工作罩, 不锈钢焊条

Abstract: Aiming at the challenges in welding stainless steel rail heads to the main rail embedded parts of the inlet gate at bottom outlet for sediment flushing at Baishuiyu hydropower station, which at a water depth of 38 meters, experiments including welding electrode selection and construction condition simulation in the high- pressure training cabin were carried out to optimize welding parameters and verify equipment. The results showed that the joint strength of both wet welding and dry welding met the design requirements. In practical construction, the process of "taking high-pressure dry welding as the main method and local wet welding as the auxiliary method" was adopted. The independently designed and manufactured local dry welding chamber can ensure welding quality, high efficiency and operation safety.

Key words: dissimilar steel, underwater wet welding, underwater high-pressure dry welding, local dry welding chamber, stainless steel welding electrode