The Harris ER5356 TIG Welding Rod, 1/8 in (3.2 mm) × 36 in, 10 lb Tube (Part 535660) is a premium magnesium-alloyed aluminum filler designed for TIG (GTAW) welding of 5xxx and 6xxx-series aluminum. The 1/8 in diameter is the most commonly requested size for aluminum plate work in the 3/16 in to 1/2 in thickness range — large enough to deposit metal efficiently without sacrificing dexterity, and compatible with all 150–300 A AC TIG machines. Harris ER5356 meets AWS A5.10 classification requirements and delivers 40,000 psi (276 MPa) minimum tensile strength — roughly 48% stronger than ER4043 — making it the filler of choice for structural aluminum, marine frames, and any application where the finished assembly will be anodized.
| Specification | Value |
|---|---|
| Manufacturer | Harris Products Group |
| Part Number | 535660 |
| AWS Classification | ER5356 (AWS A5.10 / A5.10M) |
| Diameter | 1/8 in (3.2 mm) |
| Length | 36 in (914 mm) |
| Package Weight | 10 lb (4.5 kg) tube |
| Alloy System | Al–5% Mg |
| Tensile Strength (as-deposited) | 40,000 psi (276 MPa) min |
| Yield Strength | 28,000 psi (193 MPa) min |
| Elongation | 17% min |
| Process | GTAW (TIG) |
| Polarity | AC (aluminum TIG) |
| Shielding Gas | 100% Argon; Argon–Helium blends |
| Compatible Base Alloys | 5052, 5083, 5086, 5454, 5456, 6061, 6063, 7005 |
| Service Temperature | Not recommended above 150°F (65°C) sustained service for 5xxx alloys in salt water |
Source: Harris Products Group ER5356 technical data and AWS A5.10/A5.10M.
- Marine Construction: The 1/8 in diameter delivers the deposition rate needed for aluminum hull plates (5083, 5086), bulkhead frames, and transom stringer assemblies. ER5356's magnesium content provides natural resistance to stress-corrosion cracking in marine environments — a property that ER4043 lacks due to its silicon-dominant chemistry.
- Aluminum Pressure Vessels: Compressed air tanks, hydraulic accumulators, and industrial gas vessels in 5083-H321 aluminum. ER5356 welds on 5083 are qualified under ASME Boiler and Pressure Vessel Code Section IX for Group P-22 (5083) base metal.
- Structural Fabrication: Trailer frames, aluminum flatbeds, livestock trailers, and utility equipment frames in 5052-H32 and 6061-T6. The 1/8 in diameter feeds comfortably for sustained fillet welding in these applications.
- Military & Defense: Armor plate welding (5083-H116/H321 is the standard military armor alloy); ER5356 meets MIL-E-15597 requirements for welding Class A armor aluminum.
- Sign & Architectural Aluminum: Extruded 6063 frames, signage structures, and architectural aluminum panels where post-weld anodizing must match base-metal appearance.
Choosing between 3/32 in and 1/8 in ER5356: The 3/32 in diameter (see Harris ER5356 3/32 in rod) is optimized for aluminum sheet up to 1/8 in thick at 80–130 A. The 1/8 in diameter covered on this page suits 3/16 in to 1/2 in plate at 130–230 A, and multi-pass welds on thicker sections. Using too small a rod on thick material slows deposition and increases heat input; using too large a rod on thin material makes puddle control difficult. Match rod diameter to material thickness as a starting point, then adjust for joint geometry.
Preheat recommendations: Most 5xxx-series aluminum does not require preheat for standard plate thicknesses. For castings or sections thicker than 1 in (25 mm), preheat to 200–300°F (93–149°C) improves fusion and reduces porosity by driving off surface moisture. Never exceed 300°F on 5xxx-series alloys — excessive preheat can sensitize them to intergranular corrosion in marine environments.
Storage and handling: Store ER5356 rods in a clean, dry location. Moisture on the rod surface causes porosity in the weld. If rods have been stored in a humid environment, wipe them with a clean dry cloth before welding. Unlike low-hydrogen stick electrodes, aluminum TIG rods do not require baking in an oven.
Pair with the Lincoln Precision TIG 225 or Lincoln Aspect 230 for a complete AC TIG aluminum package. For the full range of TIG filler rods, visit the TIG rod collection.
What is the difference between Harris ER5356 3/32 in and 1/8 in?
The 3/32 in (2.4 mm) diameter is best for aluminum sheet 1/16–1/8 in thick at 60–130 A. The 1/8 in (3.2 mm) diameter covered here is preferred for plate 3/16–1/2 in thick at 130–230 A. Thicker rods deposit more metal per dip, improving efficiency on heavier sections. Both rods are the same AWS ER5356 classification with identical chemistry and mechanical properties.
How many amps do I need to run 1/8-inch ER5356?
As a general starting point, use approximately 1 amp per 0.001 in of base metal thickness for aluminum (a common TIG rule of thumb). For 1/4 in aluminum, that suggests approximately 250 A — within the range of the Lincoln Precision TIG 225 (200 A max AC) with proper joint prep or the Precision TIG 375 (375 A). Run a test pass and adjust amperage until the puddle flows smoothly without burning through or lack of fusion. Foot pedal control allows you to modulate on the fly as heat builds in the part.
Will ER5356 work for welding 6061-T6 structural aluminum?
ER5356 can be used on 6061-T6, but ER4043 is generally preferred for 6061 because 6061's magnesium-silicon chemistry can cause hot cracking with ER5356 at high dilution ratios. For joints where post-weld anodizing is required, ER5356 produces a significantly better color match. Always consult the design engineer and verify against AWS D1.2 filler metal compatibility tables when welding structural aluminum per code.
Does ER5356 require special storage to prevent moisture contamination?
No special storage is required beyond keeping rods in a clean, dry location. Unlike low-hydrogen stick electrodes, ER5356 TIG rods do not absorb hydrogen from atmospheric moisture in the same way. If rods are stored in a very humid environment, surface condensation can cause porosity — wipe the rods clean before use. Do not rebake aluminum TIG rods in an oven.