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dc tig mild steel
i'm having a little trouble with my tig, it welds as though there is no gas, the electrode burns up like it would as if the gas was off. i do have gas flow, pre - during - post welding. doesn't matter which type of electrode i use lanthanated, ceriated, zirconated. i have a gas lens fitted, i recently fitted a gas dryer in the feed line in case of moisture. i'm using and have always used argon/co2 mix, i only weld mild steel. machine is a uni mig 200 a/c
anyone have any ideas? i'm about to change to pure argon just to try it
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Neil |
#2
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Have you got the polarity around the right way for TIG, positive to earth.
Graham
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Graham P |
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Dead give away for burning back is incorrect polarity. Also check the lens is not contaminated with spatter
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Rick Jones |
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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 |
#5
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If you are tig welding steel with anything other than argon you are going to have problems, CO2 is not an inert gas and that will be part of your problem. From experience tig ceramics will absorb moisture and other chemicals even when they appear dry they can outgas whatever it is they absorbed. Poor storage of you torch may have caused the gas pipe to collapse / get pin holes either restricting gas flow or allowing air in. The other very common problem is bad earth due to cable breakage or clamp making poor contact (arced surfaces)
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Paul Last edited by hot rivet; 06-29-2018 at 06:25 AM. |
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You need argon for tig.
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Mark |
#7
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Quote:
Pure argon , near perfect welds, no problem at all, changed over to argon/ co2 mig gas, not good , tiny bubbles ,craters ,and the tungsten picking up cr@p.In my opinion , for what it's worth, mixed gas doesn't work for me either. Just another thought, I Scotchbrite the copper coating off my filler rods, then wipe down, this seems to stop the bubbles anyway. Cheers, Fab.
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Neil Share what you know, learn what you don't. Last edited by fabricator; 07-02-2018 at 03:50 PM. |
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I don't know who's brand of gas you are using but I have changed over from rental bottles to owning my own and couldn't be happier. An E size argon from Pacific Gas (no affiliation, just happy customer) is $220 outright and $80 for refill.
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Peter |
#9
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Wrong Gas
I have been a welder repair tech for 21years. WRONG GAS Pure argon Pure argon Pure argon for mild steel...…….. I have heard many guys tell me they have always used a mix ar/co2 for tig and they are wrong...…..
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#10
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Definitely owning your bottles is the way to go. Over the last 7 years I have saved myself over $3200 in rentals. Your gas seems very cheap, with that price, that's not for a D Size bottle by any chance. I use Speedgas and there price is $445 outright and $145 Refill for the E Size. G Argon refill is $175. Cant wait till they do the Oxy/Accet bottles.
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John EK Holden V8 |
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