Since solder is such a poor conductor, why use it?

Timrhu, yes solder is awful now. It cracks.

Joeylawn36111, There are very localized welders that would not influence the circuits.

Almarg, I've learned that too often dismissing the impact of improvements is entirely wrong. Electrical Engineering doesn't know everything.

Almarg, I doubt seriously if the solder you and I have access to is anything like that used in the military.

Mapman, a linear amp doesn't solve the problem but could afford the welding of wires.

I guess the military need not use lead free solder. The EU has largely forced the move against lead in solder. Lead is a poor conductor as is tin, but lead tends to not crack. Welding copper to copper or silver to silver would mean no loss of conductivity.

Don_c55, as I know a guy who worked at NASA who told me of $1000/foot wire, I suspected what you said. Thanks.

I also know that systems for better grounds to Earth, weld the copper wire to the copper pipes buried deeply into the ground.

Stringreen, is there not a problem of oxidization with crimping?

Davec113, yes, solder is good for holding in place, but so is super glue. It is not conductive, however, and may harm the cables. However, the solder even for tightly crimped wires would flow between the wires.

Use a length of solder wire in a circuit and listen to what you've got. Crap!

Almarg, I'm not recommending wire-wrap only something superior to solder. Mini welding would seem the best solution.