Vacuum welding? I think I know what you are talking about but not sure. An excellent book, IMO, to read would be Mars by Ben Bova about some of the challenges faced. Of course I haven't read it in quite some time so things are a bit foggy.

I'm with Jim on this issue. -Colt

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Be not afraid of any man no matter what his size; when danger threatens, call on me, and I will equalize.