Three Methods of Precision Welded Pipe Production

1. Production Method: Tubes are directly formed from billets (sheets, strips) and welded into pipe material, with the main processes being sheet/strip forming, welding, and sizing.

Features: Few production processes, simple engineering procedures, short product production cycle, slightly lower product precision.

2. Production Method: Tubes are first directly formed and welded from billets (sheets, strips) to a certain size, then cold drawn or cold rolled into finished tubes, commonly known as DOM Welded钢管. The main processes include forming, welding, sizing, cold rolling or cold drawing (with mandrel or without mandrel), or continuous cold drawing (i.e., welding-cold drawing combined production line).

Features: Dispersed production processes, long manufacturing cycle, large land area requirement, high dimensional accuracy of products, smooth surfaces on both inside and outside, good mechanical properties, and favorable metallurgical structure.

3. Production Process: The pipe billet (sheet, strip) is first directly formed and welded into pipes of a certain size, which are then fed into a continuous sizing machine for cold sizing to become finished pipes. The main processes include forming, welding, and continuous cold sizing.

Features: Tightly packed production processes, simple workflow, high equipment production efficiency, quick range changes in specifications, suitable for producing small-diameter and thin-walled welded steel pipes.