Soldering of copper and iron pipes

 Copper and iron welding, the use of copper welding rod, do not need to clean the exterior of the iron tube, even if the exterior of the paint does not matter, directly into the copper tube more than 1cm can be. When welding, the copper welding rod heated with welding powder, the welding gun should first heat the copper pipe mouth, to be slightly red when the copper pipe, the welding gun and then in the copper and iron seam mouth at the same time heating, to be two welding parts are red, and then the copper welding rod with good welding powder and two welding parts at the same time heating, fire slightly more to the welding rod, to be melted quickly after leaving the welding rod, and then re-dipped in welding powder, followed by moving the position according to the above method until all welding is completed. The principle is that the melting point of the welding rod must be completely fused with the welded parts, smooth and flat. The bottom or reverse part can be repeatedly illuminated by a small mirror to see if the weld is well blended (intermixed) and full.

    In order to prevent the possible existence of trachoma or not welded through, the silver electrode can be heated and dipped in welding powder, the torch first heats the already welded position, to be melted when the silver electrode welded again, silver welding low melting point, fast flow, can fill the tiny trachoma and defects, can ensure that the welded joint does not leak, the welded joint is more smooth and flat. The welding rod must be re-dipped in powder each time it melts. Iron pipes are thin and have a lower melting point than copper pipes, making them more likely to burn red, as soon as you try them.