If the solder doesn't melt when touched to pipes, you might not be using enough. If the flux you are working with begins smoldering and turns black, it's a sign you are using too much heat. Getting the perfect temperature with a blowtorch may take more practice than when working with a soldering iron.Wear protective, tinted glasses, fire-proof leather gloves and flame-retardant clothing for extra safety. Make sure you always light your blowtorch away from yourself and use proper safety precautions when working with it.For the best results, adjust the torch until you have a blue flame around 2 inches (5.1 cm) long, and hold the tip of the flame to the pipes. Use a propane torch or something similar when soldering with pipes. As pipes are much bigger and more solid than intricate wiring, a soldering iron may take a long time to heat a pipe up to the right temperature. If you are using leaded solder, make sure to wash your hands once you have finished working with it as the lead is toxic.These may oxidize slightly more, but as long as you are using soldering flux they should still hold strongly for a long time. Leaded solders that are solid all the way through and don't have a rosin core are also a solid choice.It will only be a small amount, so it shouldn't replace other flux, but it will increase the flux coating of your wires. This means that they are slightly hollow and will have a thin line of rosin flux running through the middle. Some leaded solders will come with a rosin core.It is more environmentally-friendly as it doesn't contain lead, but also will not hold quite as strong. Lead-free electrical solder will also work for small wiring projects.X Research source Here are a few key differences in types of solder that may come up: Ask at your local hardware or electronics store for leaded or electrical solder and you should have a small variety of types to choose from. Leaded solder will melt at a lower temperature than other types, which makes it better for delicate electrical wiring. Opt for leaded solder when working with electronics.