New Development in Aluminum Welding Wire - Alloy 4943

Aluminum alloy 4943 filler metal is the first aluminum filler alloy to be developed for wrought commercial applications since 1968.  It was designed to provide a high strength solution with the ease of welding and other advantages of 4043.  Alloy 4043 filler metal is a popular aluminum/silicon filler alloy for general purpose welding applications but can show significant variability in strength based on welding conditions and the level of base metal dilution.  Alloy 4943 filler metal was formulated to be welded with the same weld procedure specifications as 4043, address 4043 shortcomings while maintaining the same excellent corrosion characteristics, low melting temperature, low shrinkage rate, higher fluidity, and low hot cracking sensitivity in most applications.  4943 welds exhibit low welding smut and low discoloration similar to 4043.  In addition, the new 4943 filler alloy is heat treatable and has demonstrated its improved strength characteristics in the post weld solution heat treated and artificially aged condition when compared to the currently used heat treatable filler alloy which has been generally employed for welding the 6xxx series base materials that are post weld heat treated. This presentation explains the test results of this alloy development project, shows the alloy properties compared to the traditional filler metal alloys and offers potential applications and benefits.  The fundamentals of Aluminum-Silicon alloys are also presented.  Also included are 4043 baseline test results highlighting 4043 property variability susceptibility from the weld procedure.