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In the use of helical submerged arc welded pipe and the production process, the human invention of a lot of excellent welding and production methods, greatly promoted the steady and rapid development of the industry, but also makes the industry in the development of optimization. Which submerged arc welding is a new welding method invented in 1940, it is the same as the previous manual welding is it or the use of slag protection, but the residue is not the electrode of the drug, is a special melting out of the flux The
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