Double submerged arc welded (LSAW-Longitudinal Submerged Arc Welded) was invented in 1940, a new welding method, it and the front of the manual welding the same place or the use of slag to protect it, but this is not a slag electrode coating . Straight seam double submerged arc welding and manual welding the same place or the use of slag to protect it, but this is not a slag electrode coating, which is designed out of the melting flux. The flux system consists of a funnel filled with flux through a pipeline to be welded to the front. The second difference is not used electrode using wire, because the wire can be continuously sent; electrode, we gotta burn a welding electrode head gave a throw, and the operation was stopped, and then for electrode welding.
In this way, the first advantage is fully automated; second advantage, it is carried out under submerged arc welding, the heat exchange and so it is relatively strong protection performance, higher quality weld out; third advantage as submerged arc welding arc welding flux buried underneath, so it can use a large current, welding efficiency is relatively high, the recent progress of our country's natural gas pipeline project. After wire changed, with the delivery device and the wire coil wire, the wire is continuously sent, this welding process is continuous feeding of the wire and the solder to melt under the coverage of the particulate ignition of the arc, the welding wire, base material and flux melting and evaporation constitute part of a cavity, the cavity inside the arc is stable combustion, so call it submerged arc welding. Arc is buried inside the cavity. Pipe is a high-strength steel, this pipe prefabricated in the factory inside the first paragraph, and then get on the site, in the field welding, this pipeline in the factory production process is the use of submerged arc welding, submerged arc now has become, a double wire submerged arc welding, as well as multi-wire submerged arc welding, to further improve efficiency.
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