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Aluminum TIG Welding Rod (GTAW)

Aluminum TIG welding rods are used for precision welding of aluminum where clean appearance, corrosion resistance, and strong weld integrity are required. Common alloys such as 4043 and 5356 allow welders to match filler metal to base material and application requirements. Designed for use with TIG welders, aluminum TIG filler rods provide smooth arc control and consistent results for fabrication, repair, and production welding.

Aluminum TIG rod decides whether a GTAW joint in aluminum comes out ductile or hot-cracked, and whether it survives anodising afterwards. WeldingMart stocks Harris and Lincoln Electric SuperGlaze aluminum TIG rod: ER4043 for 6000-series base metals including 6061, ER5356 and 5556 for 5000-series and marine work, 4047 where a higher-silicon filler is specified, and 1100 for commercially pure aluminum. Diameters run 1/16 in., 3/32 in., 1/8 in. and 3/16 in., supplied in 36 in. cut lengths in 5 lb, 10 lb and 50 lb boxes. Pick 4043 for flow and crack resistance on 6061; pick 5356 or 5556 when the weld has to carry load or be anodised to match the parent metal.

Frequently Asked Questions

What's the difference between ER4043 and ER5356 aluminum TIG rods?
ER4043 is a silicon-based alloy (4–6% Si) that flows easily, produces a brighter weld bead, and is the standard choice for welding 6061, 6063, and aluminum-silicon castings. ER5356 is a magnesium-based alloy (4.5–5.5% Mg) that offers higher tensile strength, better ductility, and is preferred for high-magnesium base metals like 5083, 5086, and 5456. If the finished part will be anodized, use ER5356 — ER4043's silicon causes discoloration under anodizing.
Which aluminum TIG rod should I use for 6061-T6?
Both ER4043 and ER5356 are listed as acceptable for 6061 and 6063 base metals (AWS A5.10, Table 4.6). ER4043 is preferred when crack sensitivity is a concern and for castings because its lower melting point ensures the weld pool solidifies below the base plate — this is critical with aluminum. ER5356 is preferred when the weld must be anodized or when higher strength is needed.
What shielding gas do I need for aluminum TIG welding?
Pure argon is the standard shielding gas for aluminum TIG welding (GTAW). It produces the cathodic cleaning action needed to break up the aluminum oxide layer during AC welding. Argon-helium blends are used on thicker sections to increase heat input and travel speed. Never use CO2 or argon/CO2 blends for aluminum TIG — they will cause contamination and a rough, porous bead.
What current type and polarity is used for aluminum TIG welding?
Aluminum TIG welding is done with AC (alternating current). The AC cycle provides cathodic cleaning on the electrode-positive half-cycle, which breaks down the tenacious aluminum oxide layer, while the electrode-negative half-cycle provides penetration. Using DCEN (straight polarity) on aluminum will not clean the oxide and leads to poor fusion; DCEP will melt the tungsten quickly.
What are typical TIG parameters for welding 1/8 in. (3.2 mm) aluminum plate?
For 3.2 mm aluminum with AC and a zirconiated tungsten electrode: use a 3.2 mm diameter electrode, 2.4 mm filler rod, approximately 125–145 A, with a shielding gas flow of 7 l/min (roughly 15 CFH) pure argon. These parameters come from the Air Products Welders Handbook. A 60–75° included joint angle is recommended for butt joints in this thickness range.
Do I need a zirconiated tungsten for aluminum TIG, or will pure tungsten work?
Pure tungsten (green band) or zirconiated tungsten (white band) are both used for AC aluminum TIG welding because they form a clean hemispherical ball end during AC operation. Zirconiated tungsten maintains the balled end better and handles slightly higher currents. Thoriated tungsten (red band) is designed for DC TIG on steel and should not be used for AC aluminum TIG work.