On Sat, 14 Apr 2012 20:59:42 -0700, "Bob La Londe"
wrote:

"Ed Huntress" wrote in message
.. .
On Sat, 14 Apr 2012 16:49:57 -0500, "Greg O"
wrote:

How many parts?
One or two, no idea.
Many? Roller burnisher.
Greg O

Neither ball sizing or roller burnishing is appropriate for thin
tubes.

I was waiting to see the wall thickness before commenting, based on
industry practice rather than my own experience, but I either missed
it or it hasn't been stated.

We did a lot of roller burnishing when I was at Wasino. You need some
resistance to make it work. I don't think it would iron out a weld
seam, regardless. It's used to size and to flatten the peaks of the
bore's surface finish.

Similarly, ball sizing. Unless those tube walls are quite thick, I
can't see it ironing out a weld seam. It probably would just locally
stretch the tube, unless the tube has very thick walls. That doesn't
seem likely if it's seam-welded.

.125" wall thickness.

Then I'm skeptical that ball sizing or roller burnishing would iron
out the weld. They'd probably just distort the tube.

--
Ed Huntress