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.