What is LSAW Steel Pipe?

in Here is your first Forum Wed Feb 12, 2014 5:55 am
by xinlinpipe • 3 Posts

By molding methods, the LSAW pipe can be divided into several kinds: 1. UOE steel pipe, when the single welded steel pipe edge is pre-curved, by U shape, O shape, the welding, outside welding, mechanical cooling, expanding and other processes to produce. 2. JCOE steel pipe 3. HME steel pipe: Use the mandrel bar rolling method to form according to the C-C-O mode, and cold expanding after welding.

SAW (submerged arc welding containing electro slag surfacing) is using electric arc burn under the solder layer and weld. It has high welding productivity, stable welding quality, and no arc and little smoke, so it can be the main method that used to make pressure vessels, pipe manufacturing, box beams and some other important steel structures. Although there have been many efficient, high quality new welding methods, but submerged arc welding applications has not any impact.

From the point of view that the share of deposited metal weight for many welding methods, SAW is about 10%, and didn't change for many years. When the wire is determined (usually depending on the steel welding), the supporting use of flux is the key material. It affects the mechanical properties of the weld metal directly, especially the low-temperature toughness and plasticity, crack resistance, soldering defect rate and welding productivity rate. The wire and flux weight ratio is wire: flux = 1.1:1.6, it depends on the type of welded joints, the flux types, welding parameters to make. Compared with the melting flux, agglomerated flux amount is more savings, and it's about 20% less. China's use of welding dose fluctuated around 50,000 tons, about 70% are smelting flux, and the left are non-melting flux. European and American industrialized countries use non-fused flux mainly, about more than 80-90%, but there are still fused flux production and sales, the long-lasting productivity melting solder is related to its inherent characteristics.

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