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New to Tig, wondering about sizing of tungsten for lap/ filler welds. Im running 1/16 tungsten (2% lanthanated) and 1/16 er70s-2, I was trying to run a little lap weld bead today in some 3/16 mild steel plate. The steel was ground (didnt have flap disc) until shiny on all edges and then scrubbed down with dawn dish soap and wiped dry. So Im new to tig, and I was wondering if my tungsten sizing would be a major factor as I couldnt really form a puddle in the groove, I was only able to melt the two corners of the pieces (at the lap joint) individually. I ran it at 180 amps and 13 cfh with approx 40-45 degree torch angle.Century FC-90Primeweld TIG 200D
Reply:1/16" is too small. 3/32" or even 1/8" for 3/16" More gas and straighter torch angle.
Reply:Size your tungsten based on amps required. Use the 1 amp for every thousandth of an inch rule, up to a max of about 200 amps. For 3/16ths you should be in the 160-190 amp range. A 1/16th tungsten is good to about 100 amps, a 3/32 is good to roughly 200 amps. Above that you need a 1/8th inch tungsten. |
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发表于 2021-11-30 15:51:18