摘要
Abstract
Nozzle surfacing bimetal pipe is carbon steel pipe lined with thin-walled stainless steel tube,and stainless steel layer is built up 30 mm from inner wall of the pipe end to groove by welding wire. When the composite pipe is used for butt joint, different steel welding wires can be used to complete the root welding and transition welding of the welding channel at one time, so that sealing welding, cutting, groove processing and other processes are omitted compared with the conventional composite pipe,and the working efficiency is improved. However, the stress concentration and the contraction and deformation of the nozzle are easily occurred when the pipe ends surfacing is being performed, and even cracks are generated. Therefore,while the use of this kind of composite pipe brings convenience to the construction and improves the working efficiency, controlling the quality of on-site surfacing has become a new technical issue in construction. By scientifically designing the groove form and size of the joint,defining welding sequence and technical requirements of the welding channel, the welding issue of the bimetallic composite pipe is successfully solved, and the end treatment technology suitable for field operation is developed, so that the welding quality and installation efficiency of the bimetallic composite pipe are guaranteed. Through the summary and application,experience is accumulated for the construction of pipe surfacing bimetal pipe in the future.关键词
管口堆焊/封焊/复合管/焊接工艺Key words
Nozzle surfacing/Sealing weld/Bimetal pipe/Welding technology
