Exothermic welding mold

The exothermic welding mold is made of high purity graphite and is used to form the welding head for ground exothermic welding. A complete mold is composed of mold concrete, top cover and hinge.

Detailed description:

The standard type of exothermic welding mold is suitable for most molds, and the eccentric type is mainly used in the type of welding ground rod, cross welding and other welding materials that need to be avoided. Some models need F-clamp, C-clamp and other auxiliary fixture in the use of molds.　

Composition of exothermic welding mold (fusional welding mold) : 　

The exothermic welding mold is made of high purity graphite, which is used to form the welding head of earth fire mud fusion welding. A complete mold is composed of mold concrete, top cover and hinge. The imported graphite with high compactness and good anti-friction properties is processed as the basic raw material, which has the advantages of reasonable design, long life and good ease of use.

The mold consists of a mold cover, a mold cavity, a fusion cavity, a flow channel, a mold clamp and other parts, which can withstand the melting temperature of copper, steel, iron and other metals, the flow direction of the molten metal, the flow rate and the final shape of the mold are carefully designed, usually the life of the mold is 80-200 times.

Principle of exothermic welding：　

Exothermic welding is a simple, high-efficiency, high-quality metal connection process, which uses the chemical reaction heat of metal compounds as a heat source, through overheating (reduced) molten metal, direct or indirect heating work, in the special graphite mold cavity to form a certain shape, size, in line with the engineering needs of the fusion welding joint. At present, exothermic welding has generally replaced the previous mechanical connection methods between metals.

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Advantages of exothermic welding tools：

1.The current carrying capacity (melting point) of the welding joint of the exothermic welding tool is the same as that of the conductor, and has good electrical conductivity. After detection, the DC resistance ratio change rate before and after welding is close to zero. This is unmatched by any kind of traditional connection.

2.The welding points of exothermic welding tools are molecularly bonded, permanent, and do not age.

3.The welding points of exothermic welding tools are not affected by corrosion like copper.

4.It will not be damaged by high surge current. The test shows that the conductor melts before the welding joint under the impact of short time high current

5.Exothermic welding tools are easy to operate, simple, and do not require professional personnel.

6.The heat release welding tool is simple, light, easy to carry and easy to operate

Precautions for the use of exothermic welding tools:

1.Before the construction and operation of the exothermic welding tool, it must be ensured that the welded part is free of dirt, and there is no welding slag block or welding slag powder left in the investment cavity and mold cavity.

2.Before the construction and operation of the exothermic welding tool, it is necessary to use the spray torch (or gas torch) to dry the welded part and the investment mold, so that it is as free of moisture as possible.

3.In the construction operation of exothermic welding tools, before ignition, it must be ensured that the investment cover is covered and there is no crack in the closure of the investment mold.

4.In the construction operation of exothermic welding tools, before ignition, it must be ensured that the welding point of the welded part is located in the center of the cavity.

5.During the construction and operation of exothermic welding tools, no irrelevant personnel shall stay within 1.50 meters of the site.

6.During the construction and operation of exothermic welding tools, no flammable materials shall be placed within the range of 1 to 2 meters on the site.

7.Operators must wear work gloves with a certain heat insulation effect.

8.The operator shall not face the investment mold opening to operate.

9.During ignition, once the ignition powder is ignited, the operator must immediately leave the investment mold at least 1.50 meters away.

10.When the exothermic flux reaction is complete, no person shall directly contact the investment mold and the welded part.

11.When the exothermic flux reaction is finished, the investment mold and the welded part must be cooled naturally for 10-20 seconds, and the vice (or similar tool) is used to remove it from the investment mold.

12.The insulation treatment of the welded part must be carried out after the wire is completely cooled.

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Exothermic welding mold

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