Welding cast iron demands some special procedure. It is a challenging task and there may be no two opinions about this. Cast iron, unlike most other steels, has much greater carbon content at 2 to 4 pct. This causes most cast iron to end up being brittle rendering it difficult to weld. If the next procedure is followed, cast iron can be welded with relative ease:
Employ either cooling or heating while welding cast iron since it is important to keep casting iron from the 150- to 500-diploma F range. Preheating is widely preferred, but there are times when cooling may also be done. ลวดเชื่อมเหล็กหล่อ But stick to either cooling or heating , nor attempt to change in the middle of a weld.
Though preheating the cast ironing element should suffice, it really is preferable to preheat the complete casting little by little and uniformly in the 500- to at least one 1,200-degree F variety. Be careful to heat within the expressed range as overheating may cause iron to crack. The casting should find hot merely to the extent you can to the 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 there are major cracks you must repair with studding. Studding is really a complex process calling for a great deal of skills. The first step is to drill and tap holes at first glance that has beveled. The next step is to put in metal studs and the studs should come out 5 to 6 mm above the top and the studs should then simply be welded to remain in place.
Preheated welding could be easily done – particularly for tiny and manageable items. While welding the cast iron without preheating, it is extremely essential the operator has very good control over the welding gun and generate the welds as small as possible.
Welding cast iron having an arc welder calls for different procedure. As a matter of known fact, persons capable of welding cast iron with arc welder will be few in number and there’s a great demand for such qualified persons.
You could have to either purchase or seek the services of a SMAW (shielded metal arc welding or stay electrode) welder depending how generally you do cast ironing welding with arc welder. Plug your welder into a 220V outlet and plug in your terrain cord and welder electrode holder cord in to the welder. Please understand that to weld cast iron, you will need a special electrode. You may purchase a 770 stick electrode to weld cast iron.
First of all, clean the surface area to end up being welded with a cable brush. Clamp the grounding clamp cord from the welder onto the piece of cast iron which has to be welded. Thereafter, spot an electrode in to the welder electrode holder and position the electrode near where in fact the weld has to begin.
Continue steadily to tap the electrode on the cast ironing till an arc is established and begin to weave the electrode stick from side to side. Make it a point to keep the arc slightly away from the piece of steel you’re welding. Wait for a few minutes for the weld to cool off gradually. Use the welding hammer to chip off the slag from the top of the weld.