backpurge
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if you’re running autogenous TIG welds on mild steel you need to keep the heat down otherwise the material will start to oxidise and you’ll get porosity, as above, you should be adding a proper triple deoxidised filler wire. Because you are using an argon/helium shielding gas your weldpool temperature will be increase anyway so you really will struggle unless you get some filler into the weld, I personally would be surprised if your issue was down to bad gas, it’s more a case of the application isn’t ideal