Apply the flame to the joint until it s hot enough to melt the rod.
Brazing aluminum gutter.
Aluminum brazing fluxes consist of various combinations of fluorides and chlorides and are supplied as a dry powder.
For torch and furnace brazing the flux is mixed with water to make paste.
Brazing aluminum is a quick and inexpensive option for repairing leaks cracks or holes in aluminum and is often found in air conditioning repairs.
When you sweep the tip of the rod through the joint it should melt in.
You will need to track down a specialized solder or brazing alloy intended for use on aluminum or for joining aluminum to a different metal depending on your project.
If not heat the joint more and check it again with another sweep.
Links to the tools and materials leah uses in this video.
This paste is brushed sprayed dipped or flowed onto the entire area of the joint and brazing filler metal.
You want the metal to melt the rod not the flame.
A beginner s guide to welding brazing aluminum with alumiweld rods.