Ignore that advice. There is a reason electrical codes do not permit soldered connections. Only amateur would say something that ignorant.
Here's an interesting test: take a crimp lug and solder it onto a wire of, say, 3-4ft. Do not crimp it. Screw the lug to a fixed point, such that the wire can swing freely and tie some weight onto the end of the wire. Swing it for a substantial amount of time. If swung long enough, the wire will fall out of te lug.
A properly crimped connector creates a "cold weld" as the metal in the wire is forced into the metal of the crimp connector. Just like the old wire-wrap connections. Pulling them apart is proof of it. Again, if properly done, no problem. Code usually recognizes crimp connections except in particular situations but only for solid wire because of this "cold welding." This is because it is dealing with single pieces of metal in the wire and connector. Stranded wiring is not approved because the 'cold weld' action is considered more uncontrolled/unpredictable. However, solid crimps usually have to be free from flexing as this could result in metal fatigue breakage.
You do realize that in a cars and boats all wires are stranded and crimped according to code, do you? The book "Trilogy of Connectors" from Würth Electronics gives a very good insight of connectors and crimped connections.
Not true, not one single word. All one has to do is think about for a moment to know that is BS. Please tells us how anyone that does not live in a zoo or the jungle, drags their knuckles are going to be able to work with any solid conductors larger than 6 AWG. All one has to do is read and do a little homework. Electrical codes allow solder to be used providing only if the connection DOES NOT rely on solder to be used for electrical contact or mechanical integrity.
Aircraft also says no solder in the wire connections. The heating of the copper will change the characteristics. 1st year metallurgy will show this. --Shane KDVXI
