Yes, the cold drawing process can be applied to the production of welded pipes to form cold drawn welded pipes. This type of pipe achieves performance improvement by combining welding and cold drawing processes. The specific features are as follows:
1. Definition and manufacturing process of cold drawn welded pipes
Process combination
Cold drawn welded pipes are first made into welded pipe base materials using precision resistance welding (ERW) technology, and then precision processed by cold drawing process. This process includes key steps such as multi-pass drawing, heat treatment (such as normalizing, annealing), etc. to ensure the dimensional accuracy and mechanical properties of the pipes.
Technical standards
The production follows the EU standard EN 10305-2. After welding, the overall normalizing treatment is carried out to make the weld and the parent material consistent in terms of organizational properties, and the internal stress is further eliminated after cold drawing.
2. Performance advantages of cold drawn welded pipes
High dimensional accuracy
The wall thickness tolerance can be controlled within ±0.05mm, and the surface roughness reaches Ra0.8μm (mirror level), which is better than traditional welded pipes.
Excellent mechanical properties
Yield strength is increased by 30%-50%, and compressive strength is significantly enhanced;
Fatigue life is 2.3 times that of traditional welded pipes, and burst pressure is increased by 32%.
Reliable weld quality
Using argon arc welding or laser welding technology, the weld penetration reaches more than 90% of the pipe wall thickness, avoiding the stress concentration problem of traditional resistance welding.
3. Application scenarios of cold drawn welded pipes
Hydraulic equipment
The core material of multi-stage hydraulic cylinders is the first choice due to its high precision and pressure resistance.
Precision manufacturing field
Applicable to high-precision demand scenarios such as automotive parts, aerospace, etc., and can be used directly without secondary processing.
