Description
Aluminium ER4043 Filler Rods & Wires in TIG / MIG
ER4043 is a 5% silicon, all position aluminum weld wire used to weld heat treatable alloys such as the 6XXX base metals and cast alloys. It can be found in many common welding applications, such as bicycles, trucks, trailers, and automotive parts and equipment. Silicon with this alloy gives improved wetting action yielding a less crack sensitive bright weld bead.
ER4043 is Al-Si alloy with good fluidity and is less sensitive to weld cracking and produces good weld. It has Moderate Electrical conductivity, and thermal conductivity. It has low welding smut and discoloration. This is non-heat treatable.
ER4043 has a nominal composition (wt.-%) of 5 Si, balance Al. The silicon gives improved wetting action and lowers the crack sensitivity. It is preferred by most welders because it “wets and flows better” and it also makes brighter looking GMAW welds. This filler metal is used to weld heat treatable alloys, such as the 6XXX base metals and cast alloys. It has a lower melting point and more fluidity than the 5XXX series filler metals. This filler metal is not well suited for welding aluminum-magnesium alloys (5XXX alloys). After anodizing, the color typically appears gray.
Availability of ER4043 :
- • Standard Size : 1.6, 2.0, 2.5, 3.2 & 4.0 mm Dia in 500 / 1000 mm Length
- • Packing : 500 mm in 2 Kg. & 1000 mm in 5 Kg. for TIG Welding
- • Spools : 0.8, 1.2 & 1.6 mm Dia in 6.5 Kg. Spool for MIG Welding
Classifications :
- • AWS A5.10 / ASME SFA5.10 ER4043
- • UNS No. A94043
- • DIN 1732 SG-AL Si5
- • ISO 18273 Numerical AL4043
- • ISO 18273 Chemical ALSi5
Chemical Composition of ER4043 :
| Element | ER4043 |
| Si | 4.50 – 6.00 |
| Fe | 0.80 max |
| Cu | 0.30 max |
| Mn | 0.05 max |
| Mg | 0.05 max |
| Zn | 0.10 max |
| Ti | 0.20 max |
| Al | Balance |
| Others* | 0.15 total max |
*Be shall not exceed 0.0008 percent.
Application of ER4043 TIG / MIG Wire :
ER4043 aluminum filler materials are silicon-aluminum types for welding of 6052 and 6063 types; in some cases, other aluminums are also welded with this type. Brazing of 1100 and 3003 can be accomplished with free flowing 4043 composition.
The proper choice of aluminum filler metal mainly depends on the base metal properties to be achieved and welding technique. Post weld cracking, corrosion resistance and behavior under elevated temperature also need to be taken into consideration. Cracking usually can be minimized by choosing a filler metal alloy of higher alloy content then the base metal.
