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Welded steel pipe & tube

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.

DSAW steel pipe

DSAW pipe (Double Submerged arc welded pipe)

Welded steel pipe using double-sided submerged arc welding process is often say double-sided submerged arc welded pipe (DSAW).

DSAW steel pipe production process: based on strip coil as raw material and often warm extrusion using automatic double wire two-sided submerged arc welding process. Raw material has strip volume, the welding wire and flux. going through rigorous physical and chemical testing before input. Strip head and tail docking, using a single wire or twin-wire submerged arc welding and automatic submerged arc welding rolled into the steel pipe. Prior to molding, strip is through flattening, cutting, trimming, edge planing, transportation and to the curved side surface cleaning.

Electric contact pressure gauge to control the conveyor on both sides of pressing cylinder pressure to ensure the smooth delivery of the strip. The external control or internal control roll forming. Weld gap control device to meet the welding requirements to ensure that the weld gap, diameter, misalignment and weld gap have been strictly controlled. Within the weld and outside welding Lincoln welding machine, a single wire or twin-wire submerged arc welding, the stability of the welding specifications. Weld line, ultrasonic injury instrument automatically checks to ensure the coverage of non-destructive testing of 100% spiral weld. Air plasma cutting machine to cut the pipes into a single root. Cut into a single steel pipe, each batch of steel pipe the first three strictly first inspection system, ensure that the process tube qualified and formally put into production. Marked the site of continuous acoustic flaw detection in welds, after review of manual ultrasonic and X-ray.

Strip butt weld and intersect with spiral weld where is the tube of the D-type connector, which are all through the X-ray television or film examination. Steel pipe need to hydrostatic test and pressure radial seal. Test pressure and time by a steel pipe pressure microcomputer detection device is strictly controlled. The test parameters are automatically printed records. Pipe end machining make the face perpendicular to the slope mouth and blunt edge,accurate control.

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