I have had this Miller 175 230V wire welder for about 4 years. Recently I changed out the gas tank. The old gas tank was C25 as usual. The new tank given me was Nitrogen. I didn't think this would make a difference since both lack oxygen.
Now after 4 hours of disassembling & cleaning everything no matter what settings I use for wire and amperage the welds look terrible and are very porous. Gas is flowing freely and everything seems right. Is it just the gas or am I missing something?