1. Welding welders must have a welding qualification certificate, and the welding grade should meet the corresponding welding technical requirements.

2、对接焊缝的焊接，焊缝采用单面焊、双面成型工艺，DN≥600mm时，应在管内进行封底焊。

2 welding, butt welding, welding by one side welding and double forming process, DN should be greater than or equal to 600mm, sealing welding in the tube.

3、卷管组对焊接，两纵焊缝间距应大于100mm。

3, pipe butt welding, two longitudinal weld spacing should be greater than 100mm.

4、大口径的蜜桃成人在线精品视频焊接，采用双人对称焊接。

4, large diameter pipe welding, the use of double symmetrical welding.

5、卷焊管制作完毕后，应采用角钢支撑，防止产生塑性变形。

5. After the coil welding pipe is finished, the angle steel should be used to prevent the plastic deformation.

6、蜜桃成人在线精品视频焊接后必须对焊缝进行外观检查，表面不得有裂缝、气孔、夹渣等缺陷，吸肉深度不得大于0.5mm。不合格者，不得出厂。

6. After the pipe welding, the appearance of the weld must be examined. There must be no cracks, holes, slag and other defects on the surface, and the depth of meat absorption should not be more than 0.5mm. A person who is not qualified shall not be out of the factory.

7、预制好的管段，应将内部清理干净，封闭管口，防止杂物进入。

7, prefabricated pipe section, should clean the interior, close the pipe mouth, to prevent the entry of debris.

8、管段预制完毕后要及时编号，妥善保管。根据实际情况分批运现场。

8, the pipe section should be numbered in time after the completion of the prefabrication. It is transported to the site in batch according to the actual situation.