Process, technical requirements and advantages of exothermic we

  • The process of exothermic welding

     In the lightning protection grounding construction, some copper materials or continuous casting copper-clad steel materials will be connected by exothermic welding process, exothermic welding mold + exothermic welding agent (ignition heating reaction) = exothermic welding joint. How to judge the quality of an exothermic welding head, do you know the technical standards of exothermic welding head? Below, Sunlight intelligent will explain the process of exothermic welding, the technical requirements of exothermic welding and the advantages of exothermic welding joints.

    Exothermic welding technical requirements

    The appearance of exothermic welding joints requires that the exothermic welding joints are full and complete, and the connected conductors must be completely wrapped in the joints; the surface of the exothermic welding joints is smooth and flat; the conductors must not be exposed after the surface slag is removed; should be lower than the top of the wire.

    The tensile strength of the exothermic welding joint shall not be lower than the tensile strength of the grounding body material. When the grounding body is a dissimilar material, the tensile strength of the joint shall not be lower than the lower tensile strength of the grounding body material. Under the same temperature conditions, the DC resistance value of the grounding body with welded joints shall not be greater than 1.05 times the direct resistance value of the grounding body with the same specifications and dimensions. The above are the technical requirements of exothermic welding.

    exothermic welding

    Advantages of exothermic welding joints

    \u25cfCorrosion resistance: The conductor joint ends are closely combined with pure copper molecules and covered, which can isolate and protect the joint and effectively ensure the corrosion resistance of the joint. The resistance of the connection point is not affected by time changes and is guaranteed to never fall off naturally. Short-time withstands the current test of exothermic welding joint: After the test sample is subjected to a short-time current test of 16KA/1S, there is no fusion welding phenomenon in the joint of the sample.

    \u25cfSupply the materials required for exothermic weldings, such as ignition gun, mold cleaning shovel, mold cleaning brush, blowtorch, etc. The number of welding molds should not be less than 50 times. Exothermic welding molds are equipped with in-line welding type, T-shaped welding type, and cross welding type according to requirements, and matching mold clamp control mold, which can be reused.

    \u25cfExothermic welding powder must not have agglomeration, randomly select exothermic welding powder (with packaging), check, that the maximum particle diameter should not exceed 2mm, exothermic welding powder will not agglomerate, and no chemical reaction will occur.

    \u25cfExothermic welding powder is non-toxic and non-hazardous (no phosphorus, magnesium, etc.), safe to store, and never expires. The conventional specifications of exothermic welding powder are 90#, 115#, 150#, 200#, 250#, etc. The encapsulated exothermic welding powder should have a color ring that is very easy to identify the model, and the production batch number of exothermic welding powder must be permanent Ink, laser printed on the seal, and marked with a clear exothermic welding powder code.

    \u25cfExothermic welding uses special tools, the welding materials are light, easy to carry, fast and convenient to operate, save construction and installation costs, safe and reliable, no special protection, no personal injury, and easy to learn. In order to ensure the safety of construction operators, the welding mold must have a device to prevent sparks from splashing out. Exothermic flux should not be ignited with a lighter. The above are the advantages of exothermic welding joints.