Common surface defects of welded steel pipe:

(1) layered steel
Layered wall steel tube means the cross section is divided into two floors, exposed steel surface showing the hierarchical vertical cracks. Some exhibits inside and outside surfaces of steel recessed or raised locally, layered rendering suddenly raised, dents or warping in and out of the weld.
(2) sticky scar
Pipe sticky scar refers to internal and external surfaces of the massive steel focal adhesion plaques scar.
(3) holes
Pipe through the hole refers to a local steel tube bi holes exist.
(4) open welding
Welded steel pipe opening means through long cracks in steel welds or partial showing of.
(5) Local lap welding
Welded steel pipe refers to a partial outer surface of the steel pipe presents a partial arc weld.
(6) Welding ditch
Pipe welding groove is the outer surface of the steel pipe occurs through a long groove weld.
(7) the collapse of welding
Welded steel pipe collapse refers to the outer surface of the weld metal skeletons showing through a long trench, where the surface of the corresponding convex edges.
(8) pipe joints dislocation
Steel tube joint dislocation refers to the steel pipe weld, occurred the phenomenon of staggered up and down.