404336125 - AlcoTec 4043 Aluminum TIG Welding Rod, 1/8 in x 36 in, 10 lb Box

Technical Overview of AlcoTec 4043 Aluminum TIG Rods

The AlcoTec 4043 Aluminum TIG Welding Rod is a premier choice for industrial fabrication involving aluminum alloys. Designated as AWS A5.10 ER4043 and R4043, this filler metal is characterized by a 5% silicon composition (AlSi5). The addition of silicon is critical from a metallurgical perspective; it significantly depresses the melting point of the alloy relative to the base metal, thereby increasing the fluidity of the weld pool. This enhanced fluidity improves the wetting action, allowing for smoother tie-ins at the toes of the weld and reducing the likelihood of lack-of-fusion defects.

One of the primary technical advantages of the 4043 alloy is its low sensitivity to solidification cracking. Aluminum welding, particularly with 6xxx series base metals like 6061, is prone to hot cracking. The chemistry of AlcoTec 4043 is specifically formulated to mitigate this issue, making it the standard recommendation for welding 6061, 3003, and 5052 series aluminum when tensile strength requirements are moderate. The resulting weld deposits are bright and typically free of the heavy smut often associated with magnesium-alloyed fillers like 5356.

This 10 lb box contains 36-inch cut lengths with a diameter of 1/8" (3.2mm), manufactured under the trade name ALTIGWeld®. It is classified as a general-purpose type filler alloy but also finds utility in spray and flame metallizing wire applications. While 4043 is non-heat treatable, its ease of processing and reliable mechanical properties in the as-welded condition make it a staple in aerospace, automotive, and general industrial maintenance operations. Users should note that while 4043 provides excellent weldability, it is generally not recommended for parts that will be anodized after welding, as the silicon content causes the weld bead to turn a dark gray color during the anodizing process.

The rods are produced in the United States, ensuring compliance with rigorous quality standards. The consistent diameter control and surface cleanliness of AlcoTec rods ensure stable arc characteristics and minimal contamination in the weld zone, which is paramount for high-quality GTAW processes.