How to avoid heat transfer to the electric heating coil and cause damage during welding?

To avoid heat transfer to the electric heating coil and cause damage during welding, the following measures can be taken:
Choose appropriate welding process and parameters
Use low heat input welding methods: such as tungsten inert gas welding (TIG), which has concentrated heat, stable arc, and can accurately control welding heat input. Compared with other welding methods, it can effectively reduce the heat transferred to the electric heating coil.
Optimize welding parameters: Under the premise of ensuring welding quality, try to reduce welding current, voltage and welding speed. Smaller current and voltage can reduce heat generation, while appropriately increasing welding speed can shorten welding time and reduce heat accumulation on the electric heating coil. For example, for thinner stainless steel sheet welding, the welding current can be controlled at 80-100A, voltage 12-14V, and welding speed maintained at 10-15cm/min.
Provide cooling protection
Water cooling or air cooling: During the welding process, water cooling or air cooling devices can be used to cool the electric heating coil. For example, a circulating water cooling fixture is used to place the electric heating coil in the fixture, and the heat transferred to the electric heating coil during welding is taken away by circulating water. For air cooling, you can use a fan or compressed air to blow at the electric heating coil to accelerate the heat dissipation.
Use cooling medium: Apply or spray cooling medium with good thermal conductivity near the welding area, such as thermal grease, water-based coolant, etc. These media can quickly absorb and conduct heat to reduce the surface temperature of the electric heating coil.
Take insulation measures
Use insulation materials: Place insulation materials such as ceramic fiber felt, asbestos board, etc. between the electric heating coil and the welding area. These materials have good thermal insulation properties and can effectively block heat transfer. Wrapping the insulation material on the surface of the electric heating coil, especially near the welding part, can reduce the heat transfer.
Make a heat insulation cover: According to the shape and size of the electric heating coil, make a special heat insulation cover to cover the electric heating coil and only expose the welding part. The heat insulation cover can be made of high-temperature resistant metal or ceramic material, and filled with insulation material inside, which can effectively isolate the welding heat and protect the electric heating coil.
Step welding and intermittent cooling
Step welding: Divide the entire welding process into multiple small sections, weld only a small part each time, and then pause for a while to allow the electric heating coil to have enough time to dissipate heat before welding the next section. This can avoid continuous accumulation of heat and reduce the impact on the electric heating coil.
Intermittent cooling: During the welding process, stop welding at intervals to cool the electric heating coil. You can use a thermometer to monitor the temperature of the electric heating coil in real time. When the temperature reaches a certain threshold, suspend welding and continue after the temperature drops.
In addition, before welding, you need to fully understand the electric heating coil, including its temperature resistance range, material characteristics, etc., so as to take more targeted protective measures. At the same time, welders need to have skilled welding skills to ensure the accuracy and stability of welding operations and reduce excessive heat transfer caused by improper operation.