How to weld galvanized pipe?

  • Now many industries will use galvanized steel pipe, because this material is more convenient to use, and the quality of the product is obvious to everyone, but for galvanized steel pipe welding there are a lot of people are not very understand, so, next we will introduce to you whether galvanized steel pipe welding? What are the welding skills of welding steel pipe?

    1. Whether galvanized steel pipe can be welded

    It can be welded. But the galvanized layer must be polished off at the welding place, otherwise bubbles, trachoma, false welding, etc. It also makes the weld brittle and the rigidity decreases.

    2.  Galvanized steel pipe welding skills

    The pre-welding preparation of galvanized steel is the same as that of general mild steel, and attention should be paid to the careful treatment of the groove size and nearby galvanized layer. In order to weld through, the groove size should be appropriate, generally 60 ~ 65°, to leave a certain gap, generally 1.5 ~ 2.5mm; In order to reduce the penetration of zinc into the weld, before welding, the galvanized layer in the groove can be removed and then welded. In the actual supervision work, centralized BEveling is adopted, no blunt edge is left for centralized control, and the two-layer welding process reduces the possibility of incomplete welding. The electrode should be selected according to the substrate material of the galvanized pipe. The general low carbon steel is considered easy to operate, and J422 is more common.

    Welding technique: When welding multi-layer welding seam, try to melt the zinc layer and make it vaporize, evaporate and escape the weld, which can greatly reduce the liquid zinc remaining in the weld. In welding fillet weld, also try to make the zinc layer melting and vaporization, evaporation and escape weld, the method is to move the end of the electrode forward about 5 ~ 7mm, when the zinc layer melted back to the original position to continue forward welding. Transverse welding and vertical welding, such as the selection of short slag electrode such as J427, the edge inclination will be small; The welding quality without defects can be obtained if the back and forth strip technology is adopted.

    There are three kinds of connection modes of galvanized steel pipe, which are welding connection, clamp groove connection and flange connection. Welding connection mode Welding connection of two galvanized steel pipes is the most commonly used connection mode. This mode is time-consuming, but it is not easy to leak after welding.

    Clamp groove groove connection is now a more popular connection, convenient construction, only the two steel pipes with processing groove, and then connected with clamp, this way needs to use good quality clamp, poor quality clamp easy to leak, for the future user with hidden dangers.

    Flange connection Flange connection is generally used at the connection valve

    The above is to introduce to you today about whether galvanized steel pipe welding and welding steel pipe welding skills have all the knowledge, galvanized steel pipe in many places will be used, from the above can be known, galvanized steel pipe can be welded oh.