Welding Quality Control Techniques for Straight Seam Steel Pipes

The quality control of straight seam steel pipes can only be carried out safely in the production operation, and it is also an inevitable factor to ensure the personal safety of the operators. Application areas are mainly in large-span power grid engineering, construction steel structure engineering, electric power and UHV transmission and distribution engineering, mechanical engineering, cross-sea bridges, bridges, (railroad station, airport, stadium steel structure engineering), municipal pipeline network, foundation piling , Water and gas pipelines, road construction and other supporting facilities.

1. Check whether the welding wire and flux specifications are correct according to the welding process regulations to prevent improper use of the welding wire and flux, which may cause welding quality accidents.

2. Supervise the welding environment. When the welding environment is not good (the temperature is lower than 0℃, the relative humidity is greater than 90%), corresponding measures should be taken before welding.

3. Before welding, check the groove dimensions, including gaps, blunt edges, angles, misalignments, etc., whether they meet the process requirements.

4. Whether the welding current, welding voltage, welding speed and other process parameters selected for the automatic submerged arc welding process are correct.

5. Supervise the welding personnel to make full use of the length of the pilot arc plate at the end of the steel pipe during automatic submerged arc internal and external welding, strengthen the use efficiency of the pilot arc plate during internal and external welding, and help improve the quality of pipe end welding.

6. Supervise whether the welding personnel clean up the slag first when repairing welding, whether the joints have been thoroughly treated, and whether there are oil, rust, slag inclusions, water, paint and other dirt at the groove.

Tips: Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Straight seam steel pipes can be divided into high-frequency straight seam steel pipes (ERW Pipe) and submerged arc welded straight seam steel pipes (LSAW Pipe) according to the production process. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development.