What is the effect of the solder of the welded pipe on the welding?

    Copper pipe is an important raw material for refrigeration equipment, which is mainly used for making heat ex-changers and connecting pipes and fittings. Refrigeration and air-conditioning welded pipe fittings are mostly copper (purple) pipes. Common types of solder are copper-phosphorus solder, silver-copper solder, and copper-zinc solder. According to the characteristics of the pipe material, the correct solder should be selected and operated skillfully to ensure the quality of the welding.

    1. Welding of similar materials

    (1) Brazing of copper and copper

    You can choose phosphor copper solder or phosphor copper solder with low silver content, such as 2% or 5% silver-based solder. This type of solder is relatively cheap and has a good solution. It uses caulking and wetting processes and does not require flux.

    (2) Welding of steel and iron

    Optional brass bar solder plus appropriate flux. When soldering, heat the solder to a certain temperature and insert it in the flux to make the flux melt and adhere to the solder. However, after welding, the residual flux near the solder joint must be cleaned with hot water or steam to prevent corrosion.

    1. Welding of different types of materials

    (1) Welding of copper and steel or copper and aluminum

    Silver-copper solder and appropriate flux can be selected. After welding, the residual flux near the weld joint must be cleaned with hot water or steam to prevent corrosion. When using a flux, it is best to dilute it with alcohol to form a paste, and apply it on the surface of the welding joint. During the welding, the alcohol quickly evaporates to form a smooth film, which is not easy to lose. At the same time, it can also avoid the danger of water entering the refrigeration system.

    (2) Welding of copper and iron

    Phosphor-copper solder or brass bar solder can be used, but corresponding fluxes, such as borax, boric acid, or a mixture of boric acid, are also required.

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