Welding Stainless Steel

There are such a lot of different grades that things are made of and it isn't necessarily clear which one you are about to weld.

There are ways of telling, like spark testing but I have not begun to see anyone who could tell one type of iron casting from another by spark testing.

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Think about this for a minute...Tool steels contain around one percent carbon and are regarded as tough to weld due to unnecessary toughening and even cracking problems.

Cast iron contains over 2 % carbon and sometimes up to four p.c. When that much carbon is present in iron, it toughens easily. But all that carbon serves a purpose... It turns into graphite and that really serves a purpose as a lubricant on cylinder walls of a combustion engine.

But for welding, all that carbon and graphite is horrible. Carbon in those pc.s cause toughening of the weld metal and surrounding heat area affected. To make things worse, solid iron is very brittle.

It doesn't bend, it breaks.

Back to tig welding cast. What is the best rod to conquer the unnecessary amount of carbon present in the cast-iron base metal? The most popular choice in arc welding rods appears to be nickel rods also called ni rod. But tests have shown that for tig welding cast iron, aluminum Bronze is an excellent choice.

Aluminum Bronze.

1. The weld deposit will not toughen from high carbon content.

3. Aluminum bronze tig welding rods are nearly as robust as steel

4. When welded on A/C, these Al bronze tig welding rods flow and wet simply and achieve a minimum amount of dilution from the cast iron base metal.

5. Aluminum bronze tig welding rods are much less expensive than nickel rods.

A good tip for using this rod on welding iron castings is to set the gtaw machine on A/C just like you would weld aluminum. That may let the bronze filler metal flow without mixing too a lot of the iron and carbon into the weld.

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