TIG: Fuse or Filler for Autobody Repair

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Hey guys, anyone tig body panels? old car so no electrics in car to worry about the high freq, but I'm curious if fusing the repair panels would hold up and not crack or should I definately use filler?
Reply:I would recommend filler.It would be almost impossible to avoid under cut if just blending.
Reply:If I could get a good enough fit up I would just fuse it. Undercut?Miller EconotigCutmaster 38Yes ma'am, that IS a screwdriver in my pocket!
Reply:I have at times left an 1/8" hanging out and fused that.  Otherwise the filler can help you keep control of the puddle.    DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:In some cases I've actually used filler as a heatsink almost on thin sheet.  Kept warpage down.
Reply:Originally Posted by SupeIn some cases I've actually used filler as a heatsink almost on thin sheet.  Kept warpage down.
Reply:Originally Posted by strange246What do you mean?As for undercutting it's going to get a skim coat of body filler anyhow, just curious about the strength of the fused joint on thin sheetmetal because it would drastically cut down on the amount of grinding needed, but if it's going to crack down the line I'll use some .023 mig wire as filler..Ryan
Reply:Originally Posted by SupeSome sheet metal was so thin, I'd focus the heat more on the filler wire, then wash it down onto the sheet.  Kept from blowing through the sheet, and kept the overall heat input down on the base metal to keep warpage down.  Hard to describe in words.
Reply:Autobody sheet steel is rarely the same gauge all the way through, factory forming thins it in some places and shrinks it in others.Is the panel going to have to be worked after it is welded?You must be butt welding it then, right.If you think you are going to have to work it use filler, at least at the starts.