Aluminium Brazing & Welding Materials
Clad brazing sheet, fin stock and filler metals for joining aluminium. Metline Industries supplies the materials heat exchanger makers and fabricators rely on, from Mumbai.
- Brazing alloys
- 4343, 4045, 4047
- Filler wire
- 4043, 5356, 5183
- Forms
- Clad sheet, strip, wire, rod
- Use
- Heat exchangers, fabrication
How aluminium brazing works
Brazing sheet is a core alloy, usually 3003 or a similar manganese alloy, clad on one or both sides with a thin layer of aluminium-silicon alloy. The cladding melts at a lower temperature than the core, flows into the joints and bonds the parts when the assembly passes through a brazing furnace. This is how radiators, condensers, evaporators and charge air coolers are made.
For arc welding, filler wire is chosen to match the base metal and the service conditions: 4043 for flowing, crack-resistant welds on 6xxx alloys, and 5356 or 5183 for stronger welds on 5xxx marine alloys.
Brazing and filler alloys
| Alloy | Type | Typical use |
|---|---|---|
| 4047 | Al–12% Si | Brazing filler and cladding; low melting point, very fluid |
| 4343 / 4045 | Al–Si cladding | Clad layer on brazing sheet and fin stock |
| 4043 | Al–5% Si filler | Welding 6xxx alloys and castings; good fluidity, low crack sensitivity |
| 5356 | Al–5% Mg filler | Welding 5xxx alloys; higher strength, good colour match after anodising |
| 5183 | Al–Mg–Mn filler | High-strength welds on 5083 for marine and cryogenic work |
Brazing and welding products
Brazing and welding questions
What is aluminium brazing sheet?
A core aluminium alloy clad with a lower-melting Al-Si alloy. In a brazing furnace the cladding melts and joins the parts together.
Should I use 4043 or 5356 filler wire?
4043 suits 6xxx alloys and castings and resists hot cracking. 5356 gives stronger welds and is preferred for 5xxx alloys and parts that will be anodised.
Ready to discuss your requirement?
Send us the alloy, form, size and quantity. Our Mumbai team will reply with availability, lead time and a competitive quote.
