The pre -welding preparation of galvanized steel is the same as the general low -carbon steel. It should be noted that the size of the slope and the nearby galvanized layer should be carefully handled. In order to weld, the size of the slopes should be appropriate, generally 60 ~ 65 °, and there must be a certain gap, generally 1.5 ~ 2.5mm; in order to reduce the penetration of zinc to welded seams, before welding Welding after the layer is cleared.
In the actual supervision work, centralized the ramp is adopted, without leaving the blunt edge process for centralized control, and the two layers of welding processes reduced the possibility of unproving.
The electrode should be selected according to the material material of the galvanized pipe. Generally, it is more common to choose J422 due to its easy -to -operate.
Welding method: When welding the first layer of welded welding, the zinc layer is melted and vaporized, evaporated and the welds can be greatly reduced, which can greatly reduce liquid zinc in the weld.
When welding welds welded, try to melt the zinc layer and vaporize, evaporate and reconcile the welded seams on the first layer. After melting, return to the original position and continue to welded forward.
When welding and standing welding, if the short slag welding strip such as J427 is used, the bite tendency will be small; if you use the front and rear rounds of bars, you can also obtain the flawless welding quality.
