Three ways to produce precision welded steel pipes

Method 1:

The tube billet (plate or strip) is directly formed and welded into a pipe. The main processes include plate and strip forming, welding, and sizing.

Features:

Few production processes

Simple engineering procedures

Short production cycles

Slightly lower product precision

Method 2:

The tube billet (plate or strip) is initially formed and welded into a pipe of a certain size, then cold drawn or cold rolled into a finished pipe. This is commonly known as DOM (Drawn Over Mandrel) electric welded steel pipe. The main processes include forming, welding, sizing, and cold rolling or cold drawing (with or without a mandrel), or continuous cold drawing (i.e., an electric welding-cold drawing combined production line).

Features:

Dispersed production process

Long process flow and production cycle

Large floor space requirement

High product size accuracy

Smooth inner and outer surfaces

Good mechanical properties and metallographic structure

Method 3:

After the tube billet (plate or strip) is directly formed and welded into a pipe of a certain size, it enters a continuous reducing machine for cold reduction to form the finished pipe. The main processes include forming, welding, and continuous cold reduction.

Features:

Compact production process

Simple process flow

High production efficiency

Quick specification range change

Suitable for producing small diameter and thin-walled electric welded steel pipes