Views:1 Author:Site Editor Publish Time: 2019-06-03 Origin:Site
Classification and overview of welded steel pipes
As we all know, steel pipes can be roughly divided into two categories according to the manufacturing process: seamless steel pipes and welded steel pipes. Today, we mainly talk about the classification of welded pipe.
According to the forming process, welded steel pipes can be roughly divided into three categories:
First, resistance welded steel pipe
Resistance welded steel Pipe, English name ERW (Electric resistance Pipe), the weld type is straight seam. Resistance welding adopts the pressure welding method without filling metal, and no other components are filled in the welding seam. By relying on the skin effect and proximity effect of high frequency current, the edge of the plate is heated to the welding temperature instantly, and the welding seam with forged structure is formed by extrusion roller.
Resistance welded steel pipes can be further divided into two categories: High frequency welded pipe (HFW) and Low frequency welded LFW (Low frequency welded pipe).
ERW steel pipe is mainly used to transport oil, natural gas and other vapor-liquid objects, which can meet various requirements of high and low pressure.
Spiral welded steel pipe
Spiral welded steel pipe, SSAW English name (Spiral submerged - arc welding pipe, weld type is Spiral seam. Using submerged arc welding, internal and external double welding. Submerged arc welding (including submerged arc surfacing and electroslag surfacing) is an important welding method, which has the inherent advantages of stable welding quality, high welding productivity, no arc light and little smoke.
Spiral welded pipe manufacturing diameter is large, can reach more than 3000mm, more suitable for large diameter pipe transportation and building structure.
Three, straight seam welded steel pipe
Straight seam Welded steel Pipe, LSAW English name (Longitudinally Submerged Arc Welded Pipe), the type is straight seam welding seam. The same method of submerged arc welding, internal and external double welding. The straight seam steel tube manufacture wall thickness is big, USES and the spiral welded steel tube similar.
According to the different forming processes, the direct-seam welded pipe can be divided into two types: UOE(Uing and Oing forming pipe) and JCOE (j-ing, c-ing and o-ing pipe). UOE forming method (U forming, O forming, E expanding), JCOE forming method (steel plate is pressed into J type, then pressed into C type and O type successively, and then expanded).
Need of special note is, submerged arc welding technology welding (SAW) belong to the electricity (EFW Electric Fusion Welded Pipe), is by one or a few consumable electrode and workpiece between the metallic heating combination between the metal in a process, the arc melted metal and the filler material fully, do not need to pressure, filler metal part work makes all come from the electrode.
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