Production method: Pipe materials (plates, strips) are immediately welded into pipe fittings, and the key processes are plate and strip forming, welding, and die. Features: few production processes, simple engineering steps, short product production cycle, slightly lower product accuracy.


The second production method: pipe materials (plates, strips) are immediately welded into pipe fittings of a certain specification, and then cold drawn or cold rolled into finished pipes, collectively referred to as DOM welded steel pipes. Its key processes are forming, welding, die, cold rolling or cold drawing (with or without mandrel) or continuous cold drawing (ie arc welding-cold drawing synergistic production line). Features: Dispersed production process, long production process, large area, good product specification accuracy, clean internal and external surfaces, good physical properties and alloy composition.


The third production method: The pipe material (plate, strip) is immediately welded into pipe fittings of a certain size, and enters the rotating diameter reducer to reduce the cold diameter of the finished pipe. Its key process type, welding, continuous cold diameter reduction. Features: The production process is compact, the production process is simple, the productivity of the generator set, the conversion of specifications and models is fast, and it can produce small-diameter, thick-walled welded steel pipes.