Advantages and Disadvantages of Welded Steel Pipe
The average wall thickness of the tube lamp meter is high (steel grade resolution, brightness) and can be of any length. Therefore, it shows its economy and aesthetics, using low-pressure fluids.


Welded steel pipe has the advantages of simple production process, high production efficiency, low cost and fast development speed. The longitudinal direction of spiral welding is higher than normal, which can reduce the production of large diameter billets. Different diameter billets can be used to produce the same width. What, then, compared with straight pipe joints of the same length, the welding length increases by 30 to 100%, and the productivity decreases. Therefore, most of the smaller diameter pipelines are welded by straight seam welding, and the large diameter spiral welded pipe is the most.


Classification of Welded Steel Pipes
1. The characteristics of high frequency welded steel pipes: good tubular shape, uniform thickness, corresponding calibration of internal and external burrs generated by welding tools, on-line non-destructive testing through strict control of weld quality, high degree of automation, low production cost. But the wall thickness is relatively thin, the diameter is relatively small, usually not more than 12 mm wall thickness, diameter is generally not more than 610 mm, especially suitable for the production of steel pipe truss structure.


2. The characteristics of LSAW pipeline: welding under static condition, high welding quality, short weld and low probability of defects. Compared with seamless steel, it reduces production costs and is suitable for wind and earthquake of buildings, bridges, dams, offshore platforms and other steel bearings with columns, large-span structures and towers mast structures. Ask.


3. The characteristics of spiral submerged arc welded pipe: the distribution of spiral welds, the length of welds, especially in dynamic conditions, when welding, welds have the opportunity to cool and leave forming points, which is easy to produce welding hot cracks. The direction is parallel to the weld crack, and the axis of the steel tube is at a certain angle, usually between 30 and 70 degrees. This angle coincides with the shear failure angle, so the bending, tension, compression and torsion performance is far superior to the LSAW pipeline welding location, because of limitations, Saddle Ridge seams and fish impact beautiful. In addition, in the construction process, the parent joint of the spiral weld of intersecting pipeline cracks the spiral weld, and the welding stress is large, which greatly weakens the safety performance of the components. Therefore, the non-destructive testing of the spiral weld seam should be strengthened to ensure the welding quality, otherwise the steel spiral submerged arc welded pipe should not be used in important occasions.