Due to their excellent performance, submerged arc welded pipe will occupy a large proportion of transmission fluid pipes in the future. Long-distance oil and gas pipelines and submerged arc welded pipe will gradually replace spiral submerged arc welded pipes. The common way of submerged arc welded pipe formation is analyzed, the advantages and disadvantages of various forming methods are analyzed, and suggestions and opinions on how to choose submerged arc welded pipe in actual engineering design are put forward.
Material due to the chemical composition of the raw material, although it is normal during the welding process, the weld appears cracked and tube cracks sometimes appear in the size and sound accompanying the embrittlement of the weld. Then the welding color is more blue, the temperature is normal. Sometimes we can see the deviation from the weld center, is the edge of the parent material adhesion, the formation of irregular grooves, resulting in the chemical composition of this phenomenon is raw material embrittlement.
Double-sided submerged arc welded straight seam steel pipe was invented in 1940, a new method of welding and hand welding in front of it, the same place is that it is with flux, but not the skin electrode, special flux metallurgical slag. This coating system consists of a funnel through the pipe to the front of the soldering flux. The second difference is that the electrode is not used, the use of wire, because the wire can be continuous; electrode, we burn an electrode must have a welding head, must stop running, change the electrode, and then welded.
