Welding of cast iron - Why is it so difficult?

cast iron welding is a way to play golf. Because sometimes it is great and so the only tricks you believe you have found the secret. But the next time you try, you find yourself with a new set of circumstances that you realize that you really can not find the secret of our plant. You were lucky.

The problem with cast iron is in a word ... Carbon ... and lots of it.

So what's up with carbon? Carbon is the secret ingredientsteel, heat treatment allows a very difficult, but do useful things like: drill, razor blades, gears and ball bearings.

I mean, just look for ball bearings are harder than woodpecker lips, this is hard! Follow me ... And if you have never tried a ball bearing, something to pay, you know, welding can really fragile.

Let me try to put it in perspective. Steel with high carbon content, such as ball bearings, steel contains, usually somewhere in the neighborhood of 0.6Percent to 1 percent carbon.

Now we are in cast iron. Most of molten iron of at least 3 percent of solid carbon, and sometimes as much as 4 percent of carbon. When welding is that a lot. It is not even taking into account other issues such as oil and gas combustion products, work on a lot of soldering iron.

Cast iron contains much carbon, so that is not all metal parts are dissolved in that state from the melt solidifies. Whathappens in some cast iron is that the excess carbon in graphite flakes.

These graphite flakes are good for things like engine blocks and machinery parts, lubricate it actually wear surfaces such as walls of the cylinder.

But all of the carbon in the form of graphite is very difficult to weld. reached in any area or around the weld near melting temperatures and cools quickly becomes hard and brittle.

So what is the best approach? What is the best welding Process? And what is the best use of the welding wire for welding cast iron?

I have had success a lot of time with a slightly unconventional method for 'cast iron welding. Are you ready for this?

I do them with AC TIG welding with aluminum-bronze. I know it's a bit 'off the pace, but here's my argument.

* The AC penetration DCen raise less and do not really want all the crap that is in the cast> Iron, you just want the merger.

* The AC also allows the aluminum bronze wet better at a lower current.

* Aluminium bronze rod is stronger than silicon bronze, and even some wind.

* The contraction stress of aluminum bronze are much less nickel to help prevent and bars, cracks in adjacent areas.

Whichever method is used for welding cast iron, a good warm-up of hot metal about 500-600F goes a long way and so does the cleaning of bright lightSeam area.

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