rec.crafts.metalworking zinc solder on aluminum
After some time trying to get the much heralded zinc solder rods (No Flux Needed!) to work on aluminum, a short paragraph from a maker's instruction showed the way: heat the aluminum while rubbing with the tip of the rod. When the aluminum gets to adequeat temperature, the zinc will melt & the rubbing clears the aluminum oxide. In other words, heat the aluminum not the zinc. The zinc makes an excellent thermal controller too. The aluminum/zinc area didn't show the slightest hint of excess temperature. Now, a flux is needed for situations where aluminum to be soldered can't be reached with the zinc rods. Any suggestions?