thanks for the quick reply guy's
i can definately say the polarity is correct, i've had this tig about 6 years now and it's only recently it's started to weld like crap lol. i shall check the gas lens and maybe try another. it doesn't get used much to be honest, probably an hour of welding a month at most. so it's hard to pin point when and what, if anything occured when it started going wrong (gas lens fitted, new bottle of gas)
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Neil
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