Characteristic
1. OD tolerence: ±0.05mm for small pipe diameters, for pipe diameters of 15 and above is ≤±0.1mm. surface smooth touching, without any ridges or roughness.
2. The weld seam should be uniform and neat, the inner protrusion height is ≤ 0.06mm. For pipes with a diameter of 9.5mm and above, the inner surface must be flattened without any protrusions.
