Aluminum heat welding is by superheated molten metal exothermic reaction between the metal oxide and the aluminum produced by heating the metal and to achieve a combination of methods. The welding process on the first commercial application of the late nineteenth century can be traced back to Germany, when it was used to make aluminum reduction iron castings and repair broken castings. Later this process gradually been promoted, used to connect copper busbars, electrical grounding systems and cathodic protection field between the tracks. The welding process is simple and requires no external power supply and heat, and low cost welding, stable and reliable quality, very suitable for field welding operation cables and other metal components, products covered by this specification applies to the cathodic protection system installation Copper connecting cable with steel or copper welding cable. Thermite welding thermite welding process described is the use of thermite welding hot molten metal exothermic reaction between the metal oxide and aluminum to heat generated by the metal and achieve a combination of methods. Thermite welding was founded in the late 19th century, when H. Schmidt found Gode aluminum and metal oxide by an external heat source to make it start an exothermic reaction, and once the reaction can be self-sustained, the reaction of the general formula: Metal + aluminum oxide (powder) → alumina + metal + heat thermite welding main weldable copper, brass, bronze, copper, copper-clad steel, iron, stainless steel, wrought iron, galvanized steel, cast iron, etc. ? Thermite welding characteristics and advantages of the current cross-sectional flow solder and wire equal;? Welding point is permanent, not because of corrosion caused by loose or high resistance;? Weld same as copper, while more resilient than copper itself, and is not affected by corrosion products;? weld can withstand repeated large surge (fault) current without degradation;? welding operation is simple, easy to use;? device lightweight, easy to carry;? welding, not requires an external power supply or heat;? From the outside will be able to verify the quality of welding;? be used for welding of copper, copper alloy, copper-plated steel, alloy steel, including stainless steel and high-resistance heating source material. ? Factors thermite welding processes affect the welding point one effect of a good solder joint surface plump bright, no pores, slag, cut its profile as a whole without pores and blemishes. Affect the welding effect is mainly because of moisture or water vapor, due to the mold, solder powder and to be welded are likely to adsorb moisture, so how to prevent or get rid of the water vapor is the most important step that must be taken when welding. Another factor is the impact of the welding effect and extent of the mold cleaning the workpiece, such as the surface of the workpiece to be dust, grease, oxide, or other attachments must be removed, so that the welding operation can be conducted after the clean bright, otherwise the welding conductivity and mechanical properties of the joints will be affected. If residue is left in the mold is not completely clear, it will cause the solder joint surface is not smooth, not shiny. In summary, the points to note: 1, get rid of the water vapor (available blowtorch baking), 2, clean the workpiece, 3, mold clean solder powder application notes 2 (1), each corresponding to a spot welding powder package , solder powder and mold corresponding grades required before use should be carefully controlled to confirm. (2), when the solder powder factory for its moisture has taken multiple layers of protection, but it is recommended to avoid damp properly preserved. Thermite welding connection preparation before use? Dry before each start baking mold heating tool (torch or drying box), get rid of moisture. ? After each use, clean the mold, with a soft brush or other soft items, to avoid damage to the mold. ? Check the contact surface of the mold adaptation to prevent fluid leakage copper operation from the crevice. ? Mold clamp is used to open and close the mold, mold clamp tightness influential effect on welding, please check carefully before you start welding mold folder, and make the appropriate adjustments. ? Molds made from graphite, more fragile and can not afford to throw the strong impact, it should not be beyond the die size of the weld material forced into the mold, or use hard materials and tools to remove residue. ? Mold life in general up to 50-100 times.