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Welding process control
Preparation before welding galvanized steel and low carbon steel is generally the same, you need to pay attention is to seriously handle the groove dimensions and the nearby zinc coating. For penetration, groove size should be appropriate, generally 60 ~ 65 °, to leave some space, usually 1.5 ~ 2.5mm; zinc in order to reduce the penetration of the weld, before welding can be galvanized inside groove Clear after layer and then welded. In practice, supervision, using a centralized playing groove, leaving blunt edge technology for centralized control, two welding process, reducing the possibility of incomplete penetration.
Galvanized pipe welding rod should be based on the choice of substrate material, usually low-carbon steel on account ease, use J422 is more common.
Welding techniques: When welding the first layer of the multilayer welding seam, try to make it melt and vaporize the zinc layer, evaporation and escape the weld, can greatly reduce the liquid zinc to remain in the weld. When fillet welds, as far as possible in the first layer to melt and vaporize the zinc coating, evaporation and escape the weld, the method is first removed from the ends of the electrode forward about 5 ~ 7mm, when the zinc layer melted down and continue to move back to the original position welding. Again when horizontal welding and vertical welding, such as welding slag, such as the choice of short-J427, undercut tends to be minimal; roundtrip transportation around if strip technology, but can be defect-free weld quality.
Galvanized pipe welding rod should be based on the choice of substrate material, usually low-carbon steel on account ease, use J422 is more common.
Welding techniques: When welding the first layer of the multilayer welding seam, try to make it melt and vaporize the zinc layer, evaporation and escape the weld, can greatly reduce the liquid zinc to remain in the weld. When fillet welds, as far as possible in the first layer to melt and vaporize the zinc coating, evaporation and escape the weld, the method is first removed from the ends of the electrode forward about 5 ~ 7mm, when the zinc layer melted down and continue to move back to the original position welding. Again when horizontal welding and vertical welding, such as welding slag, such as the choice of short-J427, undercut tends to be minimal; roundtrip transportation around if strip technology, but can be defect-free weld quality.
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