Also the common household will most likely have 50/50 or 60/40 solder which is not silver bearing. I was speaking to the point of "Joe Smith" stumbles across this thread and wires his trailer up using stuff laying around his house. Using a solder iron more than likely over or under wattage for the application with no tip temperature control and will leave it on for an extra hour, "just to make sure it's hot enough"
The best and safest method for the average builder would be using ferrules and not soldering them. I'm not trying to get in a pissing match here but the safety mentality in this section of the forum, after reading countless threads, astonishes me at times and I was trying to convey a safe and easy method for "Joe Smith".
Yes I am fully aware it is possible to solder a 110v connection (IF DONE PROPERLY) but I'm in no way support the average builder doing this and hence why I was arguing not to do it. The "average builder" in this section thinks it "ok" to install a 110v porch light in a shower and when it comes to temperature or enviornment limitations of a strand of wire will look at it and say "This is some thick wire, it'll work."

I'm in no way trying to insult anyone who posts here, or belittle anyones ability. I am just trying to help convey a safe way for the average joe to do electrical runs in a safe and responsible manner that can be done with the normal available household tools, supplies and knowledge. As most of the knowledge taken from this section of the forum is for people with limited electrical know how, who don't post or will find the thread long after the original posting date. My advice is primarily for them.
Also just to clarify, my advice isn't based on "feel good" application. I am a retired electrical engineer, yes I am 37 and was able to retire. I am trying to explain basic application to the masses without providing content that they will glance over and skip or will go way over their head. I was giving the basic answer.
The short answer to this huge debate is if you run across this in the future and have to be told it's safe to apply solder to a AC connection, you most likely don't have the proper tools nor experience to do it safely. Use a sleeve (or ferrule to be politically correct). That is the point of my argument "to the bitter end" against doing it.