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

2、對接焊縫的焊接，焊縫采用單面焊、雙面成型工藝，DN≥600mm時，應(yīng)在管內(nèi)進(jìn)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、卷管組對焊接，兩縱焊縫間距應(yīng)大于100mm。

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

4、大口徑的管道焊接，采用雙人對稱焊接。

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

5、卷焊管制作完畢后，應(yīng)采用角鋼支撐，防止產(chǎn)生塑性變形。

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

6、管道焊接后必須對焊縫進(jìn)行外觀檢查，表面不得有裂縫、氣孔、夾渣等缺陷，吸肉深度不得大于0.5mm。不合格者，不得出廠。

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、預(yù)制好的管段，應(yīng)將內(nèi)部清理干凈，封閉管口，防止雜物進(jìn)入。

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

8、管段預(yù)制完畢后要及時編號，妥善保管。根據(jù)實際情況分批運現(xiàn)場。

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.