The correct term is actually called walking the ceramic which is pretty tricky to learn but once u have the technique its a piece of piss im a pressure welder by trade but have had heaps of experience in the food industry purge welding stainless steel tube installing steam pipes on boilers etc your pipe fitting is quite neat mate what u using to cut the pipe? me='BOOZTJUNKEY' timestamp='1320962225' post='6104531']
You could also try the "walking the cup " style of welding to help with consistency ;-)
For stuf like intakes and cooler pipes I only do a nice hot fuse but try and roll the pipe so I get in one run ...
It's only a fuse weld but is still a full weld and plenty strong enough for cooler pipes and intakes!
As for going back over the welds I use to think it was cheating also lol but it's not that uncommon of a practice In the last year I have heard heaps of ppl say that's what they do hahaha
Although if it was structual I would do a nice hot root run first make sure u have peno first then go over it if need be