TIG Filler Wire ER4047 Aluminum Alloy – 10% Silicon, 2.4mm

Product Overview

ER4047 TIG filler wire is a premium aluminum-silicon welding alloy containing approximately 10-13% silicon, engineered for superior fusion welding of aluminum base metals. This 2.4mm diameter filler rod is specifically formulated to deliver excellent flow characteristics, reduced hot cracking tendency, and smooth, clean weld beads — making it a top choice for professional welders and fabrication shops working with cast and wrought aluminum alloys.

Key Features

• Alloy Composition: Aluminum-Silicon (Al-Si) with 10-13% silicon content
• Diameter: 2.4mm (0.094") — ideal for medium to heavy-gauge aluminum welding
• Low Melting Point: Excellent puddle control and reduced distortion on thin sections
• High Fluidity: Produces smooth, aesthetically clean weld beads with minimal spatter
• Crack Resistance: Superior resistance to hot cracking compared to 4043 and 5356 fillers on high-silicon base metals
• Corrosion Resistant: Suitable for parts exposed to weathering and mild chemical environments
• Standard Compliance: Manufactured to AWS A5.10 / ER4047 specifications

Recommended Applications

• Automotive and motorsport aluminum fabrication (engine components, transmission housings)
• Cast aluminum repair — engine blocks, gearbox casings, pump housings
• Aluminum casting repair and general foundry work
• Marine and structural aluminum fabrication
• Heat exchangers, radiators, and heavily silicon-alloyed base metals
• Dissimilar aluminum alloy joining (cast-to-wrought combinations)

Compatible Base Metals

Works well with 4043, 4047, 3003, 1100, and cast aluminum alloys such as 356 and 319 — particularly where high silicon content in the base metal calls for a matching filler to prevent weld cracking.

Why Choose ER4047 Filler Wire?

Compared to ER4043, ER4047 offers a higher silicon percentage, giving welders even better crack resistance on high-silicon castings, lower weld puddle fluidity issues, and a more forgiving arc for out-of-position welding. The 2.4mm diameter strikes a balance between deposition rate and control, suited for both manual TIG welding of thicker sections and precision repair work.

Technical Specifications

This product is priced “per KG”. The minimum quantity available to purchase is shown in the "Pack Qty".