Anti-corrosion Spiral Pipe

Anti-corrosion Spiral Pipe

 

Spiral Pipe is the strip coil as raw material, often warm extrusion molding, two-wire double-sided submerged arc welding process automatically welded spiral seam steel pipe. Submerged arc welding (including the submerged arc welding and electroslag surfacing ) an arc welding under flux layer burning. Stability of its inherent quality of welding, welding with high productivity, no arc and smoke rarely etc, and it become a pressure vessel, welding method in the manufacture of pipe, box beams and other steel structures. In recent years, has appeared in many kinds of efficient, high-quality welding method, but the submerged arc welding applications still not been any impact.

Anti-corrosion Spiral Pipe

Spiral pipe production process

 

(1) raw material strip volume, wire, flux. The input to go through rigorous physical and chemical testing.

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.

(3) prior to molding, strip after flattening, cutting, trimming, edge planing, transportation and to the curved side surface cleaning.

(4) electric contact pressure gauge to control the conveyor on both sides of pressing the fuel tank pressure to ensure the smooth delivery of the strip.

External control or internal control roll forming.

6. Weld gap control device to ensure that the weld gap to meet the welding requirements, diameter, misalignment and weld gap have been strictly controlled. 7 within the weld and outside welding Lincoln welding machine, a single wire or twin-wire submerged arc welding, in order to obtain stable welding specifications.

Welding finished weld automatically injury after line continuous ultrasound examination was to ensure that 100% of the spiral weld non-destructive testing coverage. If defective, automatic alarm and spray the tag, production workers and so adjusting the process parameters at any time, to eliminate defects in a timely manner.

Air plasma cutting machine to cut steel pipe single.

10 cut into a single steel pipe, each batch of steel pipe should be carried out to strict censorship, check the weld mechanical properties, chemical composition, fusion status, quality of the steel pipe surface and after NDT inspection, to ensure that the pipe process qualified in order to put into production.

Weld 11. Marked the site of continuous acoustic flaw detection, manual ultrasonic and X-ray review, if there are defects after repaired again after destructive testing, until the confirmation of defect has been eliminated.

12 steel butt weld, and intersect with spiral weld where the tube of the D-type connector, all through the X-ray television or film examination.

13 steel pipe hydrostatic test 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.

14 pipe end machining to face vertical, slope side of the mouth and blunt accurate control.

 

Spiral Pipe Material

 

Q235A, Q235B, 20 #, Q345 (16Mn), L245 (B), L290 (X42), L320 (X46), L360 (X52), L390 (X56), L415 (X60), L450 (X65), L485 (X70 ), L555 (X80) L290NB/MB (X42N / M), L360NB/MB (X52N / M), L390NB/MB (X56N / M), L415NB/MB (X60N / M), L450MB (X65), L485MB (X70 ), L555MB (X80).

 

Spiral Pipe purposes

 

The spiral steel pipe used in water engineering, petrochemical industry, chemical industry, power industry, agriculture, irrigation, urban construction, is one of China's development of 20 key products. The transport of liquids: water supply, drainage. Gas transportation: gas, steam, liquefied petroleum gas. For the structure: for pipe piling for bridges; docks, roads, building structure, pipe, etc.