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Ordinary steel pipe specifications and the difference of the spiral welded pipe

更新日期:2013-08-29  浏览:1253

Ordinary steel pipe specifications and the difference of the spiral welded pipe

According to the different welding methods can be divided into electric arc welding tube, high frequency or low frequency electric resistance welded pipe and gas welding tube, furnace welding pipe, bondi pipe, etc. According to the weld shape can be divided into straight seam welded pipe and spiral steel pipe. Welded steel tube used in oil drilling and machinery manufacturing, etc.
Φ 219 - Φ 2032, wall thickness 5-18 mm, material Q235, Q345, X42-70 level.

Spiral welded steel pipe refers to the steel belt or steel plate bending deformation shapes such as round, square before welding, jointed on the surface of steel pipe.
According to the different welding methods can be divided into electric arc welding tube, high frequency or low frequency electric resistance welded pipe and gas welding tube, furnace welding pipe, bondi pipe, etc.
According to the weld shape can be divided into straight seam welded pipe and spiral welded pipe.

Welded steel tube used in oil drilling and machinery manufacturing, etc.

Furnace welded pipe can be used for water gas pipe and so on, straight seam welded pipe used in high pressure oil and gas transportation, etc.; Spiral welded pipe used in oil and gas transportation, pipe pile, piers, etc.
Welded steel pipe seamless steel tube of low cost, high production efficiency.

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.

As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded pipe for the most part adopts spiral welded spiral seam submerged arc welding steel pipe will be hot rolled strip steel by the spiral bending forming, with automatic submerged arc welding seam and seam outside made spiral seam welded steel pipe (also called spiral welded pipe, spiral pipe).
Spiral steel pipe for the following reason it can be widely used in the production of large diameter steel pipe: 1) as long as the change of forming Angle, you can use the same width of the strip in the production of various diameter of steel pipe; 2) because it is a continuous forming, so the length of steel tube length is not restricted; 3) weld spiral evenly distributed throughout the steel tube on the circumference of a circle, so the size of the steel tube of high precision, the intensity is high; 4) easy to change size, suitable for the production of small batch, many kinds of steel pipe.
Steel pipe production process:

Strip head to tail docking, use single or double wire submerged arc welding, after rolled steel tube adopts automatic submerged arc welding repair welding. (3) before shaping, strip after flattening, cutting edge, edge planing, surface cleaning and flanging process. (4) on both sides of the electric contact pressure gauge control conveyor under the pressure of cylinder pressure, ensure the smooth delivery of strip steel.
Spiral steel pipe process (high precision seamless steel tube, DIN2391 precision seamless steel tube, cold drawn precision tube) :

(1) the raw material is steel strip coil, wire, flux.Have to pass strict physical and chemical inspection before investment.
(2) the strip head to tail docking, use single or double wire submerged arc welding, after rolled steel tube adopts automatic submerged arc welding repair welding.
(3) before shaping, strip after flattening, cutting edge, edge planing, surface cleaning and flanging process.
(4) on both sides of the electric contact pressure gauge control conveyor under the pressure of cylinder pressure, ensure the smooth delivery of strip steel.
(5) the use of external control or internal control roll forming.
(6) the weld gap control device to ensure that meet the requirements of welding seam clearance, pipe diameter, and quantity of the wrong side of weld gap are tightly controlled.
(7) welding and welding are used within the United States Lincoln welding machine for single or double wire submerged arc welding, to obtain the stable welding specification.
(8) after welding the weld passes the online continuous ultrasonic automatic meter check, ensure the spiral weld nondestructive testing coverage of 100%.If there are defects, automatic alarm and spray tags, production workers to adjust process parameters, in a timely manner to eliminate defects.
(9) spiral steel pipe by air plasma cutting machine to cut the steel tube into single.Cut into single pole (10), after each batch of steel pipe in the first three root must carry on the strict check system, check the weld mechanical properties, chemical composition, amalgamation, steel tube surface quality as well as through the nondestructive flaw detection, ensure that qualified pipe process, can be formally put into production.
(11) for acoustic detection on the weld mark parts, after manual ultrasonic and X-ray check, if there are defects, after repair, again through the nondestructive inspection, until defects have been eliminated.
(12) strip steel butt weld and butyl type of fellowship with spiral weld joint in the tube, all through the X ray films and television inspection.
(13) of each steel pipe after hydrostatic pressure test, radial sealing for the pressure. Test pressure and the time limit strictly policed by steel pipe hydraulic microcomputer testing device.
(14) pipe end machining, make the end verticality, slope Angle and the blunt edge to get accurate control.
 

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