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Electrodes for Tig Welding

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What electrode should I use for bare wire 5% Chrome/0.5% Moly? This is for oil refinery use. Please reply to wiocgm@candw.ag

Many thanks
 
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Specification : AWS A-5.9
Classification : ER 502
 
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I forgot to add in the last post regarding the er80s b6...the b6 bare wire runs "deader" than the er502 when running the bead (first pass). It is somewhat harder to run.
 
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