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Hey guys I've just been trying to weld a bellhousing off an old VW beetle and I'm doing it in square wave with a 2% thoriated tungsten and it seems to weld after pre heating but when it cools down you can hear it crack sometimes when I'm a bit slow with the torch to warm it down. Oh and when it's cool you move the thing and it breaks, and you can see the porosity on the gearbox side I think I shoulda cleaned it more!! Any thoughts greatly appreciated! I just went and had a look it seems to me maybe it has magnesium in it?? Cause the aluminum filler rod doesn't seem to stick to the parent metal, it's all sorta crystalised where the weld came off the bellhousing, but as I weld it seems to flow together OK, but I was welding outside and I think also the wind was blowing the argon away. I did bump the flow up to over 20cfh
The shielding gas is what keeps it from burning during welding. I would keep open flame away if you can.