Ok
I know ive seen these somewhere on here and ive searched for about an hour now.
Im looking into building my first manifold, and i liked the idea behind these.
They fit inside the pipe to be welded and allow for adjustment/backing of the next piece etc etc.
Ive googled and the only thing i come up with are welded rings from mcmastercarr/fastenal.
Any online suppliers?

 

you mean something that fits inside to help the tacking process?

 

are you thinking consumable inserts?

 

Yes this is it.
Robvon looks familiar, any online suppliers thatll sell small quantitys?
Im only going to need 20 or so...

 

my buddy used the little pool floatys for his manifolds, the small noodle kind. worked quite well.

 

i just used masking tape and then cut about 1/2" slits out with a razorblade when I wanted to throw my tack on

 

I use my Miller mig with 316 filler wire to tack and then I come back with a pencil grinder before final welding.

I have never had negative results by doing this. You can fit free handed and if you get good at it, it speeds up the process exponentially. I can have a pretty complicated manifold done in a day providing I have everything I need.