Тохойн холбох хэрэгслийн гагнуурын чанарыг хэрхэн …
1. Appearance inspection of elbow fittings: generally, visual inspection is the main method. Through the appearance inspection, it is found that the weld appearance defects of welded elbow pipe fittings are detected by 5-20 times magnifying glass sometimes. Such as undercut, porosity, weld bead, ...