1, Double submerged arc welding method in a new invention in 1940, in front of it and the manual welding the same place that it still uses residue protection, but this is not the dregs electrode coating. Straight seam double submerged arc welding and manual welding the same place that it still uses residue protection, but this is not the dregs electrode coating, specifically melting out of the flux. Flux The flux system consists of a funnel filled through a pipeline to be welded to the front.
2. The second difference is the use of electrode using wire, because wire can be continuously sent; electrodes, we burn a welding electrode must have a head gave threw it, and the operation had to stop, and then change the electrode welding.
3. In this way, the first advantage is fully automated; second advantage, which is under the submerged arc welding, so its heat exchange and protection of relatively strong performance, high quality weld out; third advantage, since the automatic submerged arc welding arc buried under welding flux, so it can use high-current, high welding efficiency, the recent progress of our country natural gas pipeline project.
4, Later changed to the wire, with the wire feed unit and wire spool is continuously sent to the wire, the welding wire is continuously fed, igniting an arc in the meltable particulate flux covering, welding wire, part of the melting and evaporation of the base metal and solder forms a cavity, the arc is stabilized combustion cavity inside, so call it submerged arc welding. Arc is buried in the inside of the cavity.
5, The pipe is a high-strength steel, such pipelines in the factory inside the first preformed section, and then get on the site, in the field of welding, the welding process such pipelines in factory production is the use of submerged arc welding, now buried welding has developed into, a double wire submerged arc welding, as well as multi-wire submerged arc welding, to further improve efficiency.
