1.     The raw materials are strip coil, welding wire and flux. They must pass strict physical and chemical inspections before they are put into operation.

2.     The head and tail of the strip are butted, using single-wire or double-wire submerged arc welding, and active submerged arc welding is used for repair welding after rolling into a steel pipe.

3.     Before forming, the strip is processed by leveling, trimming, planing, surface finishing, transportation and pre-bending.

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

5.     Use external control or internal control roll forming.

6.     The welding seam gap control device is selected 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 strictly controlled.

7.     Use electric welding machine for single wire or double wire submerged arc welding for internal welding and external welding, and then obtain stable welding quality.

Changsha Xiangjia Metal Materical Co., Ltd. the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure the good quality and competitive duration of our products.