On Tue, 7 Jun 2011 20:35:38 -0700, "Steve B"
wrote:


"Ignoramus3059" wrote in message
news
http://igor.chudov.com/misc/ebay/tmp...e/218.jpg.html

This is descrbied as: PIPE BURNING MACHINE W/6'' THREE JAW CHUCK AND
DAYTON GEARMOTOR

If that for beveling pipe?

Can I somehow use that to arc weld around round things and sell the
gas torch?

i

That is not a positioner for welding, although you might be able to
use it for positioning.....most probably with poor results. That is a
flame bevel cutter for pipe. Also, it looks sort of home made.
Probably used for a community education welding class shop for
teaching pipe welding.

In the field, the pipe will not be rotated by some kind of
"positioner". You will start on the low side of the pipe and generally
make overhead, to vertical up, to flat position welds running up each
side of the pipe joint.

You chuck up a short section of pipe on the machine's chuck, bevel cut
it with the OA torch attachment to the proper angle, then you remove
it and grind all the oxidized metal off and grind a "land" on the
inner diameter side. Repeat for another section of pipe. You now have
a joint preparation ready to be set up to make your practice welds on.

Generally, you bend a piece of OA welding rod stock (1/16th or so) and
use this to space the pipe sections for your set up. You tack the
sections together (generally four tack welds 90 degrees apart) and
then use a chisel to cut the OA rod out of the joint. You must grind
the tack welds so there is a "ramp" at both ends of the tack to assure
proper penetration of the coming root pass. Also, all slag must be
ground off of the tacks AND off of the root pass after it's made. Same
with all additional filler passes.

Then you mount this practice joint set up in the welding position you
wish to practice in. Proper joint preparation is absolutely key to
making good pipe welds.

When you set up pipe, you leave a gap between the sections to be
welded. The root pass is made using a "key-hole" technique. This forms
a welding bead on the inside of the pipe joint by welding it from the
outside of the pipe joint.

It takes PRACTICE....and I think the tool shown is for setting up
practice welds.
Dave