We tried helping one of our marching band members fix a little problem with his saxophone. The problem was that we couldn’t get the contact area hot enough for solder to melt over the entire area… A blow torch would have been better!
However, watching our prototyping guru, nicknamed Spock for anonymity, was very informative! Spock used solder paste, and first tried to heat the connection up with a hot air gun. That partially worked. So, Spock decided to switch to a ~140W soldering iron. That also didn’t cut it. But the coolest thing was that Spock used tape to keep a watch on how hot the surrounding areas of the saxophone were getting!