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A very good TIG welding technique for pipe and a few other round shapes is walking the cup. But its good to be also be able to freehand.
Sometimes there are obstacles that prevent walking the cup. For those occasions being able to prop with a tig finger can help.
Other times, a part has smooth machined surfaces and job specs will not allow the scratches from the ceramic cup.
Walking the cup is primarily a technique used for pipe welding but I have found a few other uses for it like a run of 50 round parts I welded in my shop a while back.

visit my online store here https://weldmongerstore.com/ This is part 2 of STainless steel welding tips where we talk about some pulse tig settings and also purging stainless steel with argon gas. Sometimes using copper or aluminum backing provides enough protection from oxidation on the penetration side. Other times a high purity argon purge is needed.
I used aluminum backing for most of this project but for welding the end caps, it made sense to use an argon purge.
I used the CK worldwide mt200 ac/dc tig welder using both straight DC current and pulse tig settings. The pulse tig worked extremely well on the threaded nipple fillet welds.
When purging with argon, it helps to think of argon as water.
There can be areas that trap oxygen if not vented strategically.

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for a detailed article about tig welding polarity click here
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This is part 3 of Tig welding basics. Welding using a Lincoln Tig 175 and discussing low end amp starts, what DCEN means, vs DCEP, and why AC is used to tig weld aluminum

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Aluminum Welding




welding techniques for lap joint and tee joint