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Welding | Direct diode lasers (DDL)
Laser welding makes it easy to adjust the heating area and amount of heat. Therefore, various processing shapes are available, which is an advantageous method for process reduction. Laser welding using DDL is non-contact heating that needs no consumable parts or materials such as welding electrode rods normally required for electric welding and in this way helps to reduce operating costs.
In addition, stable welding conditions can be maintained without being affected by magnetic fields.
Advantages of laser welding using DDL
High-quality welding
- Less spatter and defects thanks to heat conduction welding with a rectangular focused beam pattern
- Strong welding between materials even for butt welding and lap welding
- High welding strength thanks to a wide joint area
Focused beam pattern and profiles (example)
・DDL (top-hat beam shape)
・Fiber output laser (gaussian beam shape)
Thermal image during welding
・DDL (thermal conduction type)
・Fiber output laser (keyhole type)
Comparison of thermal conductivity type with keyhole type
| Thermal conductivity type | Keyhole type (deep penetration type) | |
|---|---|---|
| Typical lasers | DDL | CO2 laser, fiber laser, fiber output laser etc. |
| Spatter | Few | Many |
| Bead width | Wide | Narrow |
| Blowhole | Few | Many |
| Gap tolerance | Wide | Narrow |
| Aluminum welding | Possible | Depends on thickness of Aluminum |
| Suitable welding | Welding that requires wide bead width and welding of thin plates | Deep penetration welding |
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