According to the tianjin straight seam HanGuanChang home introduces straight seam welded pipe production technology is simple, high production efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than straight seam welded pipe, use a narrow billet production of larger diameter welded pipe, you can also use the same width of billet in the production of different pipe diameter welded pipe. But compared with the same length of straight seam pipe, weld length by 30 ~ 100%, and the production speed is low. From the welding process, the spiral welded pipe and straight seam steel pipe welding method is consistent, but the straight seam welded pipe will inevitably have a lot of t-shaped weld, so the probability of weld defects is also greatly improved, and the t-shaped seam welding residual stress is larger, the stress state of the weld metal are often in a three-way increases the possibility of a crack. And, according to the regulations of submerged arc welding process, each weld shall have arc and arc in, but every straight seam welded pipe when weld girth, can not meet the conditions, thus there may be more at arc welding defects.

In general, the diameter of the pipe can be divided into outer diameter, inner diameter and nominal diameter. Pipe spiral steel pipe's outer diameter with D, then attach the size of the outer diameter and wall thickness, such as the diameter of 108 seamless steel tube, wall thickness is 5 mm, with 5 D108 * said, plastic pipe also expressed in diameter, such as De63, other such as reinforced concrete pipe, cast iron pipe, galvanized pipe, DN, said nominal diameter commonly used in the design drawings, nominal diameter is convenient to design and manufacture, and maintenance of artificially provisions of a standard, also relatively nominal diameter, is of the specifications of the pipe (or pipes) name. Nominal diameter of the pipe and the inner diameter, outside diameter are not equal. Straight seam welded pipe, straight seam welded pipe production, thermal expansion tube, etc., to strip steel as raw material, the high frequency welding equipment on the straight seam welding of tube to call straight seam welded pipe. (due to spot welding with steel pipe into a straight line and name). According to purpose is different, and different production working procedure, after. (can be roughly divided into the scaffold tube, fluid pipe, wire casing, stent tube, guardrail tube etc). Straight seam welded pipe standard of GB/T3091-2008 and the low pressure fluid welded pipe is a kind of straight seam welded pipe, water, gas transmission, is more than general welded pipe after welding ends to a water pressure test, so the low pressure fluid tube a little higher than ordinary straight seam welded pipe prices generally (according to the present market price, higher than about 80 yuan), for example: welded steel pipe fluid tube 1 inch (DN25) (33.5 * 3.25 is Φ) in about 4300 per ton, and ordinary straight seam welded pipe at around 4350.

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