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Submerged arc welding pipe
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Submerged arc welding pipe: is a strip coil as raw material, often warm extrusion molding, spiral automatically double wire submerged arc welding process double-sided into pipe joints.
Submerged arc welding pipe
Characteristics of submerged arc welding pipe: straight welded pipe production process is simple, high production efficiency, low cost, rapid development. Spiral welded pipe ERW pipe strength than high, can use a narrow billet production of large diameter pipe, also can use the same width of the billet production of different pipe diameter. But with the same length of straight pipe, weld length of 30~100%, and lower production rate. Therefore, most of the smaller diameter pipe welded, large diameter pipe mostly using spiral welded
Submerged arc welding pipe material: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9,
Large diameter submerged arc welded pipe
0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80
(1) the volume of raw materials that strip, wire, flux. Before we put into rigorous physical and chemical testing.
(2) of strip head and tail docking, using single or double wire submerged arc welding in steel pipe, the automatic submerged arc welding.
(3) before forming, strip after flattening, cutting edge, edge planing, surface cleaning and delivery to the bending edge processing.
(4) the electric contact pressure gauge control conveyor on both sides of cylinder pressure, ensure the smooth conveying the strip.
(5) the external control or internal roll forming.
(6) used to weld gap control device to ensure the weld gap to meet the requirement of welding, pipe diameter, misalignment and seam gap have been strictly controlled.
(7) in welding and welding are used in the United States Lincoln welding machine for single or double wire submerged arc welding, thereby obtaining the stable welding specification.
(8) end of the seam welding have been injured on-line continuous automatic ultrasonic inspection apparatus, the NDT 100% coverage of spiral weld. If defective, automatic alarm and spray marking, production workers and adjust process parameters, the timely elimination of defects.
(9) the air plasma cutting machine to cut a single pipe.
(10) into a single tube, each batch of steel tube head three to strict inspection system first, chemical composition and mechanical properties of welding, inspection, blending, surface quality of steel pipe as well as a nondestructive inspection, process to ensure that the tube qualified, can be formally put into production.
(11) acoustic detection for weld mark the site, after manual ultrasonic and X ray review, if there are defects, after repair, again after testing, until the defects have been eliminated.
(12) strip butt weld and intersects with the D spiral weld joint in the tube, all through X ray TV or film inspection.
(13) each pipe by hydrostatic pressure test, the radial sealing pressure. Test pressure and time by detecting pipe hydraulic microcomputer control. Test parameters automatically print records.
(14) the pipe end machining, the end verticality, accurate control of slope angle and blunt edges.
Submerged arc welded pipe and its standard classification: the use of spiral submerged arc welded pipe conveying fluid (SY5036-83) pressure pipeline is mainly used to transport oil, natural gas; seam high frequency welding steel tube with spiral conveying pressurized fluid (SY5038-83), high frequency welding method of welding lap, used for pressure flow spiral conveying body seam high frequency welding steel pipe. Steel pipe, strong bearing capacity, good plasticity, easy welding and processing; for spiral submerged arc welded pipe conveying general low-pressure fluid (SY5037-83), using double-sided automatic submerged arc welding or welding method for welding steel pipe made of water, gas, air and steam etc generally low voltage liquid transportation
As of 2009, standard submerged arc welding pipe is generally divided into: SY/T5037-2000 (standard, also known as the common fluid conveying pipe in a spiral submerged arc welded steel pipe, GB/T9711.1-1997 (GB), also called the petroleum and natural gas transmission pipe - Technical delivery conditions - Part 1: steel pipes (as of 2009 the strict requirements of the GB/T9711.2 grade B steel tube)), API-5L (American Petroleum Institute, also called line pipe; which is divided into PSL1 and PSL2 two levels), SY/T5040-92 (pile for spiral submerged arc welded pipe) [1]
Submerged arc welding pipe material: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80
Edit this section performance advantages
Anti-corrosion insulation double submerged arc welded pipe is a pipe in a different work environment to ensure double submerged arc welded pipe inner and surface temperature at the same time to slow or prevent the chemical, electrochemical action of medium or by the metabolic activity of microorganisms has been eroded and deterioration of the insulation anticorrosion measures.
Performance of anti-corrosion insulation double submerged arc welded pipe:
[1] good insulation properties, heat loss is only the traditional double submerged arc welded pipe 25%, long-term operation can save a lot of energy, significantly reduce energy costs.
[2] has strong waterproof and corrosion resistance, no attached pipe ditch, can be directly buried underground or underwater, the construction is simple and rapid, low comprehensive cost.
[3] double submerged arc welded pipe under the condition of low temperature also has good corrosion resistance and impact resistance, can be directly embedded underground permafrost.
[4] the service life can reach 30-50 years, the correct installation and use can make double submerged arc welded pipe repair cost is very low.
[5] can be set to alarm system, automatic detection of double submerged arc welded pipe leakage, accurate fault location and automatic alarm indication.
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