[ben7799]

They don't have to weld in an inert gas chamber.

Titanium welding is typically done by purging the air around the weld and/or pumping the inert gas into the parts being welded assuming they're tubes, etc.. A bunch of the gasses involved are heavier than air and that property can be used to come up with clever solutions.

Maybe the Russians built a giant chamber but that seems like a very non-russian solution considering their great awareness of KISS. More likely they found a way to seal an area around the weld and weld in sections that allowed them to pump inert gas into small areas near the welding equipment.

[rdtsc]

Ah ok. They were showing people putting on what looked like moon suits and going into a chamber. I imagine that's for smaller scale welds. But I imagine pumping argon under pressure to displace oxygen in some areas would work as well. Then ventilate properly as it would settle and well ... suffocate people.