Would you mind explaining exactly how a solder connection fails "under high
load conditions"

when the connection is soldered it lacks mechanical integrity. solder is soft
and any chance of movement -- any, even walking on a floor near the equipment
in a building -- loosens the connection until it eventualy fails. Even if
after soldering the connection is clamped TIGHTLY with a mechanical clamp it
eventually fails.

If the connection is FIRST clamped TIGHTLY mechanically and _then_ soldered for
corrosion protection all if right and holy.