1. What is the allowable working pressure of welded pipes?
It depends on:
Steel grade
Wall thickness
Outer diameter
Standard and safety factorCalculated by standard formulas.
2. Can welded pipes be used for high-pressure service?
Yes, but only high-quality ERW, LSAW, or SSAW pipes that meet strict standards like API 5L PSL2 or GB/T 9711.
3. What is the difference between Q235B and Q345B?
Q235B: Yield strength ≥235MPa, low carbon, general structure.
Q345B: Yield strength ≥345MPa, high strength, for load-bearing structures.
4. Can welded pipes be bent?
Yes. Thin-wall and medium-wall pipes can be bent, but excessive bending may damage the weld seam.
5. Can welded pipes be threaded?
Small-diameter ERW pipes (DN15–DN100) are often threaded for connection. Large-diameter pipes use flanges or welding.
