Get some spray electronics cleaner and wash the circuit boards well on both sides. Then with a good light look carefully for bad/dry solder joints. Some components may stand up too high off the board and they may wiggle back and forth. Also be watchful of the board edge connectors as the may be the problem of bad connections.
Robert
SOURCE: bad tig weld job
Wow you have a lot of variables here. Let's go over some of them.1.AC current 2.100%argon shield gas 3.Check your Tungsten, it must be the recommended 1or 2% and the right size, clean and the tip rounded by meting 4. High freq. turned to continous-not just "START"
5. CLEAN,CLEAN,CLEAN your Alum. with a S.S. brush that has touched NOTHING else in in it's life!
Start here and GOOD luck
SOURCE: Need operating instructions for Thermal Arc 190 GTS tig welder
Try this one if not it go to the next link for manuals.
http://www.thermadyne.com/IM_Uploads/DocLib_2143_300X4838.pdf
http://www.thermadyne.com/thermalarc/component/option,com_doclib/task,/id,/Itemid,237/categoryID,4/
SOURCE: have a lincoln square wave 175 tig maching with
buy a Cobra lead and torch head already equiped would be you best bet.
SOURCE: Problems with welding with a Forney 180 amp. Arc Stick Welder
check your input power connections on the primary side of the welders transformer, then if its an infinite control welder check that control,otherwise if it's a plug- in selectable amperage check these connections,it sounds like the infinite control is getting dirty and not passing all the current it shows on the control, also double your O.C.V. on the secondary and see if its with-in welder specs
SOURCE: I have a Precision Tig 185 with 1 1/2 hours total
Have you got the TIG torch and earth lead pluged in the wrong way around ? Should the torch be negative and earth positive ?
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