Weldcote 4043 (Commonly Referred To As Aisi5) Is A 5% Silicon Aluminum Filler Metal That Is Available In Spools Or Cut Lengths For Mig Or Tig Welding Processes. 4043 Aluminum Filler Metal Is Recommended For Welding 3003, 3004, 5052, 6061, 6063 And Casting Alloys 43, 355, 356, And 214. The Melting Range Is 1065-1170 Degrees F With A Density Of .097 Lbs./Cu.In. The Average Tensile Strength Is 27,000 Psi, Average Yield Strength Of 18,000 Psi And The Post Anodizing Color Is Gray. 4043 Aluminum Filler Metal Is One Of The Oldest And Most Widely Used Welding And Brazing Alloys. The Silicon Additions Result In Improved Fluidity (Wetting Action) To Make The Alloy A Preferred Choice By Welders. The Alloy Is Less Sensitive To Weld Cracking And Produces Brighter, Almost Smut Free Welds.