You can t braze dirty sooty material.
Brazing sheet metal with mapp gas.
Brazing is a technique for joining pieces of metal together by filling the join between the two metal pieces with a molten intermediary metal.
Heat the joint where the two pieces of metal will meet until the joint glows.
Others rely on air to provide oxygen to the flame.
Light the welding torch and adjust the flame.
Used it to weld an exhaust bracket good for those types of repairs on the trail since it can secured in a small space.
Professional mapp gas torch brazing torch of mapp propane gas 1 5m hose for brazing soldering welding heating application can also be used for bbq hvac plumbing tywel 2 4 3 out of 5 stars 100 33 16 33.
Position the metal as desired.
Torch burns too much oxygen very expensive to operate.
Touch the flame to the work pieces and move in a small circle to melt the material at the weld zone.
I also have the small oxy propane mapp gas torched too.
A convenient method of preplacing filler metal is by using a brazing sheet an aluminum alloy base metal coated on one or both sides.
The 7 minute burn time for an disposable oxygen bottle goes faster than you think.
In most cases an overlapped joint will be stronger and braze together easier than a gapped joint.
If needed use clamps to secure the pieces in position.
Apply the brazing rod to the joint while continuing to heat the metal surfaces.
Some mapp torches use a separate oxygen cylinder.
The oxygen tank does not last long at all.
Like is mentioned they are good for welding or brazing small steel items.
The process of brazing refers to the use of gas generated heat 800 degrees f and an iron free filler such as aluminum to join to different metals.