https://thumbs.gfycat.com/FirmBronzeFlea-mobile.mp4
Another good find. Here it is inline:
<video controls autoplay loop>
<source src="https://diqn32j8nouaz.cloudfront.net/slow_motion_tig_welding_1000fps.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
I move the torch back as I add filler then run over the pool. Doesn't look like any TIG welding I do or have observed others doing in real life. That said I have watched videos on YouTube where people are basically lying the filler rod down and running the torch over it.
Should the torch move forward or backward? Here we go...
https://www.youtube.com/watch?v=UNAAhwieNhU