Why Laser Welding
Laser welding is a fusion process where metal is melted to join components together or a filler wire is melted onto the surface to build up areas. Heat is produced and there will be a heat affected zone (HAZ), but generally the heat input into a laser welded job is a small fraction of that produced using conventional welding techniques.
The huge energy density of laser (usually NdYag) is the essential reason why laser is so precise and neat a process; a 2mm penetration weld performed with a laser will typically result in a 60% narrower weld and an 80% smaller molten weld pool compared with TIG welding.
Where do you gain with laser welding?
- Very low distortion due to low heat input = lighter gauges can be utilised
- Deep penetration without high heat input = high aspect ratio e.g. 3mm wide but 8mm deep
- Minimal dilution when welding dissimilar metals = low propensity for cracking
- Welding dissimilar thickness materials is possible
- Better control on aluminium welding
- Very high precision
|Weld pool size||2-10mm||4-15mm||0.2-3mm|
|Penetration||max. 5mm||max. 5mm||0.1-10mm|
|Filler Wire||Handfed, or up to 5m/min.||Up to 20m/min.||Autogenous or hand fed|