[Marco Reps] was soldering some boards with a lot of thermal ... different than in other tips and would require some special techniques. He started with a Maxim thermocouple chip.

Have a look at [VoltLog’s] video about his techniques for soldering BGA and inspecting that you managed to do it right. He’s got quite a few tips about things like surface finish and flux ...

The following instructions and techniques produce leak-free soldered ... Dry-fitting the tube and fittings before soldering will ensure that the fittings are square and the runs straight.