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The Guidelines For Welding Cast Iron?

The Guidelines For Welding Cast Iron?

Oct 21, 2022

Welding cast iron calls for some special procedure. It is a challenging task and there can be no two opinions about that. Cast iron, unlike most other steels, has much greater carbon content at 2 to 4 percent. This causes most cast iron to be brittle making it difficult to weld. If the following procedure is followed, cast iron can be welded with relative ease:

Use either cooling or heating while welding cast iron as it is important to keep casting iron out of the 150- to 500-degree F range. Preheating is widely preferred, but there are times when cooling are also done. But stick to either cooling or heating and do not attempt to change in the middle of a weld.

Though preheating the cast ironing part should suffice, it is preferable to preheat the entire casting slowly and uniformly in the 500- to 1,200-degree F range. Be very careful to heat within the stated range as overheating may cause iron to crack. The casting should get hot just to the extent you can to touch it comfortably with your bare hand. If need be, make short welds intermittently to avoid overheating.

Occurrences of small cracks when welding cast ironing, is inevitable. You can apply some sealing compound to prevent leakages. If there are major cracks you must repair with studding. Studding is a complex process calling for a lot of skills. The first step is to drill and tap holes on the surface that has beveled. The next step is to put in steel studs and the studs should come out 5 to 6 mm above the surface and the studs should then be welded to remain in place.

Preheated welding can be easily done - particularly for small and manageable objects. While welding the cast iron without preheating, it is extremely essential the operator has good control over the welding gun and make the welds as small as possible.

Welding cast iron with an arc welder calls for different procedure. As a matter of fact, persons capable of welding cast iron with arc welder are few in number and there is a great demand for such skilled persons.

The welding way is suitable for the grey iron or ductile iron small parts, such as dumbell, plate, bearing etc.


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