On Tue, 10 Jan 2006 08:41:21 GMT, Ernie Leimkuhler
wrote:

In article .com,
"Ardilla Volante'" wrote:

I need some help.


I am making a gigantic " weather vane type thing" (technical term?).

(some very thick material and I am slightly intimidated)

its made up of 4 arms coming out radially from a central bearing unit.

the arms are a mix of rectangular tubing (6" x 2" x 1/8" thick.) and
3/8" plate.

the central unit is machined from a round of 12" 6061. it rotates on a
hardened point with a delrin collar.

I need to stick the arms to the bearing. The two pieces mate on a
flat groove vertically along the bearing.

____the question______

is the extra penetration gained from using Ar/He worth the extra
dollars?, (we've been using straight Ar)


You didn't say how thick the piece is.
If it is really thick then use a high Helium mix, like 75% Helium 24%
Argon.


also, aside from oxy acetylene, what pre-heat methods have any of you
had luck with?

any help would be much appreciated.

Propane weedburners work great and are fast.

Say Ernie..I picked up a tank from Reliable Tools sometime back..they
tend to sell me their tanks cheap cause they dont want to mess with
them..

2.5% CO2
7.5% Argon
90% helium

There was a piece of masking tape that said "stainless steel"

Is that too much CO2 to use it for tigging? Will it burn up my
electrodes too fast or can I use it for Aluminum or general welding?

If I had to guess..I figure it was for MIG..but its got 2000lbs of gas
in it and Id hate to have to vent it cause I cant use it.

Thanks

Gunner

The aim of untold millions is to be free to do exactly as they choose
and for someone else to pay when things go wrong.

In the past few decades, a peculiar and distinctive psychology
has emerged in England. Gone are the civility, sturdy independence,
and admirable stoicism that carried the English through the war years
.. It has been replaced by a constant whine of excuses, complaints,
and special pleading. The collapse of the British character has been
as swift and complete as the collapse of British power.

Theodore Dalrymple,