Most use propane, but you can use acetylene also. Just as long as you don't get it too hot. Propane will not melt copper, but acetylene will.
both
When soldering a person can use an electric tool or a torch. The torch uses a flame, while an electrical tool has a soldering tip which is heated.
Soldering is more or less permanent unless you break it with a hammer or melt it with a torch.
You need a torch when you're soldering metals or when you're storming Frankenstein's castle.
notice that sharkbite fittings have plastic inside them and torch heat will damage them renedering them useless and make it an expensive plumbing mistake.
Brazing can be done with a small torch or a big soldering iron. Either electric or brazier heated. The tip on a torch should be small as you don't need the heat you use when gas welding or cutting.
What valve?...on the torch? Open it up enough to play a good flame. If you are soldering on a valve, you need to take out the valve stem from the body unless you want to melt the seats. Opening the valve is not enough.
the number 3.0 describes the level of shade protection in the glasses. Green safety glasses are worn when you are used to protect your eyes when you are working with metal. Specifically, 3.0 glasses should be use when you are torch brazing, torch soldering, or cutting metal.
Welding or brazing perhapsReplacement is best Solder has too low a melting point to be good in such a high temperature environment. After running the car for a few miles, you could apply the solder to the muffler and it will melt without a torch or soldering iron.
Torch
Brazing is actually not a method of welding as it does not melt the joint metal together. Brazing is actually much closer to soldering. It is a process that (usually) uses a gas torch and a thin brass rod to bind two (or more) pieces of metal together. The torch heats the joints surface to the melting temperature of brass at which time the brass filler rod is melted into the joint to fuse them together.
no