--snip

The shop next to me has just started doing titanium welding.  Inert gas has
to be applied to both sides of the weld I 'm told.

Doug in Japan

Correct, Doug
In fact, whenever possible, the internal portion of a weld should be purged
during the weld process.
This prevents oxygen infiltration on the backside, and produces a smoother
finish.
To allow a constant flow of shielding gas, and not pressurize, I place
copper
or brass wool on each end of the tube.
Archie

On the Ti22 CanAm we did it in a large box with a plexi cover
and long rubber gloves.

Paul Lamar

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