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Another factor affecting the exothermic welding is the cleanliness of the exothermic welding die and the material to be welded. For example, dust, grease, oxides or other attachments on the surface of the welding object must be completely removed. The welding operation can be performed only after it is clean and bright, otherwise the electrical and mechanical properties of the connector after soldering are affected. If the residue left in the exothermic welding mold is not completely removed, the connector surface will not be smooth and not shiny.
Then there is the degree of surface smoothness. If the surface is uneven, there are no impurities on the surface, and impurities indicate that the purity of the solder powder is not enough, and the amount of heat is not enough. The purity and heat of welding powder are very important for exothermic welding. The purity of the welding powder will directly affect the corrosion resistance of the joint. Generally, the high purity welding powder has good corrosion resistance and is seriously corroded. The use of the site can be used for 50 years, and the use of solder powder of low purity on the same site will greatly shorten the service life.
How to check whether the exothermic welding joint is standard
Exothermic welding is a simple, high-efficiency, high-quality metal joining process that uses metal compound chemical reaction heat as a heat source, through superheated (reduced) molten metal, directly or indirectly heated to work in a special graphite mold Forming a certain shape in the cavity is now popular for exothermic welding. The main material that affects the welded joint is the exothermic welding powder, also called exothermic flux. The purity of the powder is of critical importance to the welded object. First of all, look at the firmness of the joints. If the welding body is profiled to see if there are bubbles, there are bubbles to indicate that the firmness is not enough, or the mold design is unreasonable. A good exothermic welding connector should have a full, shiny surface and be cut open to view its entire body without defects. The most important factors affecting the welding effect are moisture and moisture. Since exothermic welding molds, exothermic fluxes (solder powders), and the materials to be welded are likely to absorb moisture, how to prevent or repel moisture is exothermal. Important steps that must be taken during welding.