Trying to find the best way of doing this as my welder informed me you cannot weld the aluminium gate to the cast turbo? I was thinking of just welding a wee cast plate over the hole?
i would very much doubt the penny is aluminium due to it being in the exhaust path in the turbo.
im not a welder, but make sure you preheat the area before welding, then i would just use cast welding rods. then let it cool naturally, dont cool with water.
many people do this and they are not aluminium are normaly stainless steel or mild but can be welder with a normal mig welder..... who ever you went to proberly just didnt want to do it but what i did i took the penny off the holder welded it complete so get a complete seal then put the holder back on dude