Yes, but you have to be very careful due to the heat distortion that may result from use of the torch. You need to accurately jig the part to keep it from "walking" out of shape. A better solution might be to have a friend with a TIG set up weld it up for you. There's less heat spread over the area to minimize warping the part. If you go the Alumiweld route, practice on some scrap before you attempt the final job.