Brazing Temperature

When welding, you have to heat the workpiece enough so that the solder flows cleanly and completely wets the joint. If the temperature is too low, the solder won't flow and you'll get cold, porous spots. If you overheat it, the material will burn or the grain structure will become coarse and brittle. So you need to get a feel for when the solder draws into the gap on its own – that's the point to work at. You can monitor this with a temperature measuring device or simply by how the flame and solder behave.