Double-sided submerged arc welding pipe application:
Double sided spiral submerged arc welding pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction.For liquid transportation, water supply and drainage.For gas, gas, steam, liquefied petroleum gas.For structure: piling pipe, bridge;Dock, road, building structural tube, etc.
Spiral steel pipe main technical characteristics:
A. forming process, the steel plate uniform deformation, residual stress is small, the surface does not produce scratches.Processing spiral steel pipe on the scope of the size of diameter and wall thickness has great flexibility, especially in the production of high grade thick wall tube, especially the medium and small diameter thick-walled tube has an advantage, can meet the requirements of users in the aspect of spiral steel pipe specifications more.
B. using advanced double-sided submerged arc welding process, can be in the right position for welding, is not easy to appear the wrong side and defects such as lack of penetration, welding, welding quality easy to control.
C. the quality of steel pipe to conduct a comprehensive inspection, make the whole process of steel pipe production are under effective detection, effectively guaranteed the product quality.
D. the whole production line all equipment with the function of the computer data acquisition system networking, realize the data real-time transmission, by the central control room of the technical parameters in the process of production.

Spiral steel pipe bending strength

Pile with spiral weld pipe (SY5040-2000) is a hot rolled steel coil tube billet, often spiral shape, made of double-sided submerged arc welding or high frequency welding, used in civil construction, port, bridge pile foundation with steel pipe.

Weld process: spiral steel pipe will strip into welded pipe unit, through multi-channel roll rolling, strip steel rolled up gradually, there is an open space to form the round billet, adjust the quantity of the squeezing roller, make the weld gap control in 1 ~ 3 mm, and make joint flush on both ends.
1. If clearance is too large, resulting in a decrease of proximity effect, eddy current heat is insufficient, the joint between the weld crystal bad and incomplete fusion or crack generation.
2. The proximity effect increases, such as the gap is too small a result of welding heat is too big, cause the burning of the weld;Or weld after extrusion, rolling the deep pit formation, affect the surface quality of the weld.
Two edges of billet heating to welding temperature, under the extrusion of squeezing roller, to form a common metal grain interpenetrate, crystallization, eventually forming solid weld.If the spiral steel pipe extrusion pressure is too small, the amount of common crystal small, weld metal strength drops, stress produces after cracking;If the extrusion pressure is too large, will make molten metal being squeezed out of the seam, not only reduce the weld strength, and can produce a large number of inside and outside burr, even cause the welding seam defects such as.