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see a detailed article here http://goo.gl/0P8fMy and visit our store here http://weldmongerstore.com/ Tig welding some aluminum cylinders today using 4643 filler rod.
4643 filler rod is sometimes called out for heat treatment reasons because it responds better to heat treat than 4043.
Too high a preheat temp can alter the properties of aluminum in the heat affected zone.