TIG Stainless with rods or not ?

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I never learn TIG, but where i work we have a TIG guy who let me practice sometimes, more of the time i just stay at work after my day and look at him how he's he doing!Most of the time he's tacking without filler rod, just melt the base metal together and looks good tacking, he do this mostly on tubing handrail or small pieces, he also tell me that if the welds need to be small you can weld this way to! I just tend to not really understand ''basic rules'' on when filler rods should be used and when its not needed ? My only goal is to be able to fit and tack (not weld) with TIG on stainless pretty soon and want to know that kind on information correctly!Calculator > Bevel Square
Reply:welding without adding filler is called "autogenous" . i believe stainless is pretty well suited  for t his in certain cases, dependent on very good fitup.....mild steel not so good..others who know more will answer...
Reply:By ''very good fitup'' do you mean no gap, perfectly joined ?Calculator > Bevel Square
Reply:Originally Posted by LayoutManBy ''very good fitup'' do you mean no gap, perfectly joined ?
Reply:I usually tack without filler. But if there is a gap, you will need filler no matter what. I have not messed with much stainless, but have welded mild steel with stainless filler. I personally prefer the filler, but I have not found a reason to not use it yet.Offering CNC Plasma cutting and welding projects.Follow me on facebook https://www.facebook.com/nobigdeal.fabSupport those that support WW.
Reply:Originally Posted by LayoutManBy ''very good fitup'' do you mean no gap, perfectly joined ?