What are the classification of welded pipes?
(1) By process - arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welded pipe, furnace welded pipe. (2) According to the weld seam - straight seam welded pipe, spiral seam welded pipe.
Welded pipes (welded steel pipes) can be classified according to manufacturing process, weld form, use, material, shape and other dimensions
Classification by manufacturing process
High frequency electric resistance welded pipe (ERW)
Submerged arc welded pipe (SAW)
Laser welded pipe
Gas welding pipe
Process description
Use high-frequency current to heat the edge of the steel plate and weld it into a pipe through pressure
Using submerged arc welding technology, the weld is covered with flux, divided into straight seam (LSAW) and spiral welding (SSAW).
Use high-energy laser beam welding, high precision, small heat-affected zone.
Heating and welding by oxy-acetylene flame (traditional process, less used now).
Features and applications
- Smooth welds and high production efficiency;
- Used for water pipes, gas pipes, and structural pipes (such as scaffolding).
- Deep weld and high strength;
- Suitable for large-diameter high-pressure pipelines (such as oil and natural gas pipelines).
- Narrow weld seam and good surface quality;
- Used for precision machinery, automobile exhaust pipes, etc.
- Low cost, but unstable weld quality;
- More common in small workshops or maintenance scenarios.
2. Classification by weld form
II. Classification by weld form
Straight welded pipe The weld is a straight line, the process is simple, and the production efficiency is high.
Spiral welded pipe The weld is spiral, which can produce large diameter pipes with uniform overall strength.
Seamless welded pipe The difference between the weld and the base material is eliminated through heat treatment, and the performance is close to that of seamless pipe.
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