Cleaning before welding of pipeline automatic welding machine

1. The nozzle has been cleaned up to the standard according to the cleaning requirements.
2. Special nylon slings for hanging pipes must be used for hoisting steel pipes at the counterparts, and other slings are not allowed, especially steel wire ropes are strictly prohibited for hoisting steel pipes.
3. The pairing of steel pipes must be done with a mouthpiece, and it is strictly forbidden to use only a screwdriver.
4. Pair gap.
5. Misalignment ≤ 1.0mm.
6. The distance between adjacent annular seams is greater than 2.0 times the outer diameter of the pipe.
7. The stagger gap of spiral weld or straight seam should be greater than 100mm
8. Do not use a sledgehammer to directly hammer the nozzle for strong correction before matching.
9. After the root welding starts, no correction of any kind shall be carried out on the wrong joint.
10. All welders who participate in welding must hold a welding qualification certificate, and must wear the logo certificate with them during the welding work.
11. When welding pipes, it must be carried out in strict accordance with the requirements of the welding procedure qualification guide, and the welders of each layer of welding operations should keep abreast of the welding parameters of this layer, such as current and voltage.
12. The electrode must be dried before use. The drying temperature is 70°C to 80°C, but the maximum cannot exceed 100°C, and the holding time is 0.5 to 1 hour.
13. The welding rod must be stored in the welding rod insulation tube, and it can be taken out at any time. The storage time of the welding rod in the insulation tube should not exceed 10 hours.
14. The annular preheating temperature of the nozzle is not less than 100°C, and the total width is not less than 150mm. Pay attention to the uniformity of heating when measuring the temperature, especially the temperature of the bottom and back.
15. Each welding joint must be welded once in a row, and the starting positions of two adjacent welding layers should be staggered by more than 20-30mm.
16. The temperature between the root welding and the hot welding layer shall not be lower than 100°C
17. When the ambient temperature is lower than 5°C, thermal insulation measures should be taken after welding.
18. When the daily working break exceeds 2 hours, the nozzle of the welded pipe section must be temporarily blocked.