Welding cast iron calls for some special procedure. It is just a challenging task and there can be no two opinions about that. Cast iron, unlike most other steels, has much higher carbon information at 2 to 4 per-cent. This causes most cast iron to be brittle rendering it difficult to weld. If the next method is followed, cast iron could be welded with relative ease:
Use either cooling or heating while welding cast iron since it is important to help keep casting iron out from the 150- to 500-level F range. Preheating is greatly preferred, but periodically cooling may also be done. ลวดเชื่อมเหล็กหล่อ But adhere to either cooling or heating and do not attempt to change in the middle of a weld.
Though preheating the cast ironing element should suffice, it is preferable to preheat the entire casting little by little and uniformly in the 500- to 1 1,200-degree F selection. Be careful to heat within the expressed range as overheating could cause iron to crack. The casting should find hot merely to the extent you can to touch it comfortably together with your bare hand. If need be, make short welds intermittently to avoid overheating.
Occurrences of tiny cracks when welding cast ironing, is inevitable. You can apply some sealing compound to avoid leakages. If you can find major cracks you must repair with studding. Studding is really a complex process calling for a great deal of skills. The first step would be to drill and tap holes on the surface that has beveled. The next step is to put in metal studs and the studs should come out 5 to 6 mm above the surface and the studs should in that case be welded to stay in place.
Preheated welding can be easily done – particularly for little and manageable things. While welding the cast iron without preheating, it is extremely essential the operator has fine control on the welding gun and help make the welds as small as possible.
Welding cast iron having an arc welder demands different procedure. As a matter of fact, persons capable of welding cast iron with arc welder will be few in number and there’s a great demand for such skilled persons.
You could have to either purchase or retain the services of a SMAW (shielded metal arc welding or stick electrode) welder depending how normally you carry out cast ironing welding with arc welder. Plug your welder right into a 220V outlet and then plug in your ground cord and welder electrode holder cord into the welder. Please know that to weld cast iron, you will need a special electrode. You may buy a 770 stay electrode to weld cast iron.
First of all, clean the surface area to end up being welded with a wire brush. Clamp the grounding clamp cord from the welder onto the piece of cast iron which has to be welded. Thereafter, spot an electrode into the welder electrode holder and posture the electrode near where the weld has to begin.
Continue steadily to tap the electrode on the cast ironing till an arc is created and commence to weave the electrode stay laterally. Make it a point to help keep the arc slightly from the piece of steel you’re welding. Wait for a few minutes for the weld to cool-down gradually. Utilize the welding hammer to chip off the slag from the top of the weld.