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Spiral welded pipe production by submerged arc method is based on using tandem welding technique for joining inside and outside coil edges, which have been trimmed and beveled by carbide milling for high quality weld structure.
Spiral submerged-arc welding pipes
Spiral submerged arc welding(SSAW) is its forward direction and forming tube centerline hose reel molding angle (adjustable), side molding edge welding and weld them into a spiral.

Difference between SSAW steel pipe and LSAW steel pipe

Metallurgical properties of raw materials
Straight seam submerged arc welding tube is made of steel, but spiral submerged arc welding steel pipe production is usd hot rolled steel coil strip. The hot strip rolling process with a series of advantages, has a metallurgical process for production of high-quality line pipe capacity. Welding process
From the welding process, spiral steel pipe welding method is the same as lsaw steel pipe, but the straight seam submerged arc welding tube inevitably will be a lot of T-weld, so the probability of presence of welding defects also greatly improved, and T-welds welding residual stress weld metal are often in a three dimensional stress state, increasing the possibility of cracks.

According to the submerged arc welding process requirements, each weld should have the arc at the extinction,but each steel pipe is unable to meet the conditions in welding girth,which may be at the extinction more welding defects.

Welcome to Sunny Steel Enterprise Ltd.

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.
 

Main alloy pipes & tubes

ASTM A213 T11 Seamless alloy pipes
+ ASTM A335 alloy pipe
ASMT A333 Grade 6 seamless pipes
+ ASTM A333 Alloy pipe


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