Jim Davey
R H Davey Welding Supplies Ltd
- Messages
- 5,737
- Location
- Southampton
It doesn't expand, the tip does. There are tips specifically designed for ally, they are a different grade of copper that copes better with the higher reflected heat, slightly more clearance and a more pronounced chamfer on the hole at the end. Ask your supplier for them and use the 1.0mm Alu tips for 1.0mm wire 1.2mm tips for 1.2mm wire etc.