The basic need of permanent welding method is welding moulds

Posted by jmvexothermic on October 23rd, 2017

Exothermic welding is the one stop method to make everlasting connections for an electrical installation. In order to provide strong permanent joints in various protection systems to our structures we need exothermic welding. For catering lightning protection to our high rise buildings we need to joint our conductor on various points, the National Building Code (NBC) has recommended exothermic joints for the same. Similarly for earthing systems also NBC has recommended these joints.

For getting exothermic joints we require welding moulds to get the various shapes of joints such as X joint, L joint, T joint, straight joint etc. Now days, many manufacturers have come up who are providing exothermic solutions along with the moulds.

Technical features of Exothermic welding

Reliability: The molecular bonding offers 100% contact surface so that there will be no probability for the oxidation process to take place which causes corrosion.

Conductivity: Exothermic welding molds form a solid bond which assures the continuity of current between the conductors.

Ageing free: These connections do not get affected by ageing and also there is no problem of getting loosens with time as there is no use of nuts and bolts or clamps.

Large cross-sections improve performance: Exothermic joints have surface area greater than the conductors to be joined which improves the performance under fault conditions.

Process of making Exothermic Joints

Step 1: Put the conductor in the mould after cleaning.
Step 2: shut the mould with the help of handle clamp.
Step 3: Place the disc and pour the weld powder into the mould.
Step 4: Shut the lid and Fire it using flint ignitor.
Step 5: Open the mould after sometime, once the metal solidifies.
Step 6: Remove the slag from the mould before making the next bonding association.

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