Spiral Welded Pipe Manufacturing Process

keywords:  Spiral welded pipe machine, quality inspection process，Shandong Dorco Heavy Machinery Co., LTD.

Shandong Dorco Heavy Machinery Co., Ltd. is a professional manufacturer specializing in spiral pipe machines and finishing equipment for many years. We offer high-quality products at competitive prices, and our production cost, consumption, and productivity have reached international advanced levels.

1、We provide on-site installation and guidance services.

2、We offer professional technical training to ensure that the buyer's operator can quickly master the operation and use of the equipment.

3、Our products come with a one-year warranty. During this period, any damaged parts will be replaced free of charge.

Spiral welded pipe manufacturing process:

1. The raw materials are strip steel coils, welding wire, and flux. Strict physical and chemical tests are required before investment.

2. The strip head and tail are connected by single wire or double wire submerged arc welding, and automatic submerged arc welding is used for repair welding after coiling into steel pipe.

3. Before forming, the strip undergoes leveling, edge trimming, edge planing, surface cleaning and conveying, and pre-bending treatment.

4.  The electric contact pressure gauge is used to control the pressure of the cylinders on both sides of the conveyor to ensure the smooth transportation of the strip.

5.  Adopt external control or internal control roll forming.

6.  The welding seam gap control device is adopted to ensure that the welding seam gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the welding seam gap are all strictly controlled.

7.  Both internal welding and external welding adopt American Lincoln electric welding machine for single-wire or double-wire submerged arc welding to obtain stable welding specifications.

8.  The welded seams after welding are inspected by an online continuous ultrasonic automatic flaw instrument, which guarantees 100% non-destructive testing coverage of spiral welds.  If there is a defect, it will automatically alarm and spray the mark, and the production workers can adjust the process parameters at any time to eliminate the defect in time.

9.  Use an air plasma cutting machine to cut the steel pipe into individual pieces.

10.  After cutting into single steel pipes, the first three of each batch of steel pipes shall undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status of the welds, the surface quality of the steel pipes and pass non-destructive inspections to ensure that the pipe manufacturing process is qualified Later, it can be officially put into production.

11.  The parts with continuous sonic flaw detection marks on the weld are re-examined by manual ultrasonic and X-ray.   If there are defects, after repairing, they will go through non-destructive inspection again until the defects are confirmed.

12.  The pipes where the strip steel butt welding seams and the D-shaped joints intersecting with the spiral welding seams are all inspected by X-ray television or filming.

13.  Each steel pipe undergoes hydrostatic pressure test, and the pressure adopts radial seal.         

The test pressure and time are strictly controlled by the steel pipe hydraulic microcomputer detection device.   The test parameters are automatically printed and recorded.

The pipe end is machined to accurately control the verticality of the end face, bevel angle and obtuse edge.

If you would like to learn more, please feel free to let us know!

Yvonne.chu

Dorco Marketing Department