SIF Aluminium TIG Filler Rods - 4047A 12% Silicon (ER 4047) - 1.6mm to 5mm Dia.
- Aluminium TIG filler rods containing 12% silicon for high silicon alloys
- Available in multiple diameters with 2.5 kg and 5 kg pack weights
- Ideal for colour matching, repair, and automotive applications
- Superior corrosion resistance; not suitable for anodised fabrications
- Requires argon or argon/helium shielding gas with DC+ current

4047A Aluminium TIG Rods are specialised aluminium rods containing 12% silicon, making them ideal for high silicon alloys and automotive applications. These rods are particularly chosen for scenarios where colour matching to the parent material is crucial.
With excellent mechanical properties and superior corrosion resistance, they are suitable for silicon-bearing cast aluminium alloys and wrought alloys. However, they are not recommended for fabrications that are intended to be anodised.
Features and Benefits
- High Silicon Content: Contains 12% silicon, ensuring compatibility with high silicon alloys.
- Excellent Corrosion Resistance: Offers superior protection against corrosion.
- Versatile Applications: Suitable for silicon-bearing cast aluminium alloys and wrought alloys.
- Color Matching: Ideal for situations where color matching to the parent material is essential.
Typical Applications
- Aluminium Castings: Suitable for all types of aluminium castings.
- Repair and Surfacing: Ideal for the repair, surfacing, and construction of various items like window frames, tubes, furniture, engine blocks, and automotive parts.
- Aerospace Sector: Frequently chosen in the aerospace industry.
- Brazing Alloy: Used as a brazing alloy, especially on thin gauge materials.
Welding Positions

Ensure that the parent metal surface is cleaned and fully degreased prior to welding. Clean joints with a stainless steel brush.
| Product Type | Tig Rods – Aluminium |
| Part Number | RO161601 |
| Diameter | 1.6mm – 5mm |
| Weight | 2.5 KG – 5 KG |
| Shielding Gas | Argon, Argon/Helium |
| Current | DC=+ |
| Si | 12% |
| Al | Balance |
| Melting Point | 585°C |
| Ultimate Tensile Strength | 130 N/mm² |
| Hardness | 50 (unit) |
Certifications & Standards
BS: 2901 4047A [NG2]. ENISO 1873 S Al 4047A
| Brand | Weldability Sif |
| Weight | 2.5kg · |
| Diameter | 3.2mm · |
| AWS Classification | ER 4047 |
| Material Type | Aluminium (ER4xxx/5xxx) |
| TIG Rod Diameter | 1.6 mm, 2.4 mm, 3.2 mm, 5 mm |
| TIG Rod Weight | 1 kg, 2.5 kg |
| SKU | Weight | Diameter | Stock Status | |
|---|---|---|---|---|
| RO161625 | 2 5kg | 1 6mm | In Stock | £56.73 ex VAT £68.08 inc VAT |
| RO163225 | 2 5kg | 3 2mm | In Stock | £36.69 ex VAT £44.03 inc VAT |
| RO165025 | 5kg | 5 mm | In Stock | £51.41 ex VAT £61.69 inc VAT |
| RO162425 | 2 5kg | 2 4mm | In Stock | £42.21 ex VAT £50.65 inc VAT |
Product Information
Download PDFTechnical Data Sheet
Download PDFA carriage charge is applied to orders, for standard 1-2 day shipments to mainland destinations within the United Kingdom. Other destinations and premium services are available but subject to additional freight charges.
SIF Aluminium TIG Filler Rods - 4047A 12% Silicon (ER 4047) - 1.6mm to 5mm Dia. Get in touch
Have a question about this product? Our team of welding experts are here to help.
Visit Us
12 Mary Seacole Road
The Millfields
Plymouth, Devon
PL1 3JY














Reviews
There are no reviews yet