Aluminum is a real challenge to join without specialized brazing equipment. You will need advice on a specialized solder or brazing alloy intended for use on aluminum, or for joining aluminum to a different metal or alloy depending on your application. Once you're set with the solder, the challenge lies in working quickly enough to join the aluminum immediately after the aluminum oxide layer has been scraped off the surface. Brazing aluminum requires precision and process control. Induction heating offers both.