Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

Spiral steel pipe, welded steel pipe production process


Spiral steel pipe, welded steel pipe production process

spiral steel pipe

Is a strip coil as raw material , often warm extruded to automatic double -sided submerged arc welding process wire spiral welded steel pipe.
( A ) raw materials that strip , wire, flux . In the input before going through rigorous physical and chemical testing .
( 2 ) strip head and tail docking, a single or double wire submerged arc welding , in the rolled steel by automatic submerged arc welding .
( 3 ) before forming the strip after flattening, cutting , trimming, planing , surface transport and to the curved side .
( 4 ) use of electrical contacts control the conveyor cylinder pressure on both sides to ensure a smooth transfer strip .
( 5 ) with external control or internal control roll forming .
( 6 ) with gap control device to ensure that the weld gap to meet the welding requirements , diameter, volume and the wrong side of the weld gap have been strictly controlled.
( 7 ) , welding and soldering are used outside the United States Lincoln welding machine for single or double wire submerged arc welding , thereby obtaining a stable welding specifications.
( 8 ) After welding the weld line continuous ultrasonic injury checks to ensure 100% coverage of non-destructive testing of welds spiral . If defective, automatic alarm and spraying tags , production workers so adjusting the process parameters, and remove defects.
( 9 ) using air plasma cutting machine to cut the pipes into a single root.
welded steel pipes
( 10 ) into a single steel pipe , steel head three each batch to be strict inspection system to check the weld mechanical properties, chemical composition, fusion status , steel surface quality and after NDT inspection, to ensure that the pipe process after passing formally put into production.
( 11 ) there is a continuous sonic weld inspection mark on the site , manual ultrasonic and X-ray review, if there are defects after repair again after destructive testing, until the confirmation of the defect has been eliminated.
 

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