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　　Product type: Thermite flux

　　Use of welding die: used for welding flux and wire to steel pipe tools.

　　Product specifications: can be welded 6 square, 10 square, 16 square, 25 square and other specifications of the cable. Edge protection

　　Thermite welding kit:

　　Thermite welding is a method of combining metals by heating the superheated molten metal produced by the exothermic reaction between metal oxide and metal aluminum.

　　The welding process simple operation, does not require an external power source and heat source, and the welding of low cost, stable and reliable quality, very suitable for field welding

　　operation of cable and other metal components, this manual involves the product is suitable for the cathodic protection system installation in the process of copper core cable and

　　connection of steel structure welding or copper cable.

　　Thermite welding process introduction:

　　Thermic welding began in the late 19th century, when H. Goldschmidt found that the exothermic reaction between aluminum powder and metal oxide could be initiated by an

　　external heat source, and once the reaction could be self-sustainable. The general formula for this reaction is:

　　Metal oxide + aluminum (powder) → alumina + metal + heat

　　Thermal-aluminium fusion welding can mainly weld pure copper, brass, bronze, copper, copper clad steel, pure iron, stainless steel, wrought iron, galvanized steel, cast iron, etc.

　　The characteristics and advantages of thermite welding:

　　The current closure of the welding point is equal to that of the wire;

　　The solder joint is permanent and will not cause high resistance due to loosening or corrosion.

　　The solder joints resemble copper but are stronger than copper itself and are not affected by corrosive products;

　　The solder joints can withstand repeated large surge current (fault) without degradation;

　　The welding operation method is simple and easy to use.

　　The equipment is light and easy to carry;

　　When welding, no external power or heat source is needed;

　　The quality of welding can be verified from the appearance:

　　Can be used for welding copper, copper alloy, copper plated steel, all kinds of alloy steel including stainless steel and high resistance heating heat source material.

　　The main points of thermite welding process:

　　①Factors affecting welding effect

　　The surface of a good solder joint is full and bright, without pores and slag. After cutting, its section becomes a whole without pores and defects. The most important reason that affects the welding effect is moisture or water vapor. Because the mold, welding powder and the welded object may absorb water, how to prevent or remove water vapor is the most important step that must be taken during welding.

　　Another factor that affects the welding effect is the cleanliness of the mold and the welded object. For example, the dust, grease, oxide or other attachments on the surface of the welded object must be removed to make it clean and bright before welding operation can be carried out. Otherwise, the electrical conductivity and mechanical properties of the welded joint will be affected. If the residue left in the mold is not completely removed, it will cause the solder joint surface is not smooth, not bright.

　　To sum up, the key points to pay attention to: ?remove water and gas (can be baked with blowtorch), ?clean the welding, ?clean the mold

　　②Matters needing attention when welding powder is applied

　　(1) 、Each package of welding powder corresponds to a solder joint, and the welding powder brand number should correspond to the mold, which should be carefully checked and confirmed before use.

　　(2) 、Multi-layer protection has been taken for the welding powder when it leaves the factory, but it is recommended to keep it properly to avoid moisture.

　　Preparation of thermite welding joint before use

　　Before each start, use a heating tool (blowtorch or drying box) to bake and dry the mold to remove water and gas.

　　Clean the mold after each use with a soft brush or other soft object to avoid damage to the mold.

　　Check the density of the contact surface of the mold to prevent the leakage of copper liquid from the gap during operation.

　　Die clamp is used for opening and closing die, the tightness of die clamp has an impact on the welding effect, please check the die clamp carefully before welding, and make appropriate adjustments.

　　The die is made of graphite, which is relatively fragile and cannot withstand the impact of throwing and strong force. Therefore, welding beyond the size of the die should not be forced into the die, or hard materials and tools should be used to remove the residue.

　　The service life of the mold is generally more than 50-100 times.