Power plant boiler water wall tubes
Thread Content
The water wall tubes of the power plant boiler need to be replaced due to wear. After the pressure-welders replaced each water wall tube one by one and completed the welding of the membrane walls, I would like to ask whether it is necessary to grind each of the longitudinal welds on the membrane walls as well as the transverse welds on the water wall tubes. It’s urgent!
Pre-welding preparation: Before welding, the pipe ends should be prepared with a 30° bevel, and the area within 15 mm inside and outside the pipe ends should be polished to reveal the natural color of the metal. The gap between the pipe ends should be 1~3 mm. When the actual butt gap is too large, a transition layer must first be weld-on one side of the pipe groove. Temporary wind-shielding facilities should be set up, and the wind speed at the welding site must be strictly controlled, as wind speeds above a certain level can easily lead to the formation of pores. It must be carried out by experienced welders with a high level of technical skill. Manual TIG welding is used for the root pass,
It was replaced due to wear; it is recommended to grind the side facing the fire as well. After all, local rough areas are more prone to wear. The backfire side doesn’t matter.