Galvanized steel pipes, which have dual advantages such as strong corrosion resistance and low prices, and its utilization rate is also getting higher and higher, but in some cases, it is necessary to welded the galvanized pipe. How to ensure the quality of welding? What's more?
Precautions for welding of galvanized pipes:
1. In order to ensure the welding quality, it should be treated with galvanizing at the welding mouth. First, the galvanized layer of the welding place should be polished, and the galvanized layer of the galvanized layer of the sand wheel or sandpaper should be used to clean the galvanized layer with gas welding. Otherwise, bubbles, trachoma, fake welding, etc. will be produced. It will also make the welds crispy, rigid decrease, etc.
2. Galvanized steel pipes with a diameter greater than 100mm should be connected in flang or card cover -type dedicated pipes.
3. The welding of galvanized steel pipes and flange should be galvanized at the second time.
Measures to ensure the quality of welding galvanized pipes are:
1. Human factors are the control element of gas -galvanized pipe welding. Due to the lack of necessary welding control methods, it is easy to cut corners and affect the quality; at the same time, the welding special characteristics of galvanized pipes make it not easy to ensure welding quality. Therefore, before the start of the project, you should choose welders with skilled technology, should hold the corresponding boiler pressure container, or a considerable welding certificate to conduct necessary technical training and bottom. Give a permission to enter the scene. It is not allowed to replace it at will to ensure that the welding pipe welders are relatively stable.
2. Control of welding materials: ensure that the welded material of regular channels is purchased, there are warranty books and qualification certificates, which meet the process requirements; Dosage; welded materials should be baked strictly in accordance with the process, and the amount is not more than half a day at one time.
3. Welding machine; welding machine is a welding machine, which must ensure reliable performance and meet the needs of process; welding machines must have a qualified current and voltage gauge to ensure the correct implementation of the welding process. Welding cables should not be too long, and welding parameters must be adjusted for a long time.
4. Welding process method: ensure the implementation of the special operation method of galvanized pipes, conduct pre -welded rating inspections according to the welding process, control the welding process parameters and operation methods, check the appearance quality after welding, and increase the lossless detection after welding. Control the amount of welded material at the welding level and the amount of welded in each mouth.
5. Welding environment control: Ensure that the temperature, humidity, and wind speed during welding meet the process requirements. Welding is not allowed when you are unconditional.
