Longitudinal welded pipe consumption process is simple, high consumption efficiency, low cost, the development of faster. The strength of spiral welded pipe is generally higher than that of straight seam welded pipe, and it can use narrower billet to consume welded pipe with larger pipe diameter size, and it can also use the same width of billet to consume welded pipe with different pipe diameter size. But compared with the same length of straight seam pipe, the length of the welded seam increases by 30 to 100%, and the consumption speed is lower. Therefore, most of the smaller diameter welded pipes are straight seam welded, and most of the large diameter welded pipes are spiral welded.
Spiral submerged arc welded steel pipe SY5036-83 is mainly used for oil and gas pipelines; spiral high-frequency welded steel pipe SY5038-83 is welded with high-frequency lap welding method and is used for spiral high-frequency welded steel pipe for pressurized liquidity preservation. Steel pipe pressure-bearing ability, good plasticity, easy to weld and process forming; ordinary low-pressure liquidity preservation with spiral submerged arc welding steel pipe SY5037-83, using double-sided automatic submerged arc welding or single-sided welding method for water, gas, air and steam and other ordinary low-pressure liquidity preservation with submerged arc welding steel pipe
Length and allowable deflection: a. Length: steel bars are usually delivered in fixed lengths, and the detailed delivery length should be specified in the contract;? When the steel is delivered in coils, each plate should be a steel bar, allowing 5% of each batch? of the number of discs (lack of two discs when there can be two discs) consists of two bars. Spiral steel pipe factory its plate weight and plate diameter by the supply and demand sides to negotiate the rules. b, the length of the allowable deflection: the length of the steel bar according to the length of delivery shall not be greater than + 50mm. c, bending and end: straight bar bending should not affect the normal use, the total bending is not greater than 40% of the total length of the bar; bar ends should be sheared straight, part of the deformation should not affect the use.