Production Engineering

Spiral steel 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.

(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