Manual laser welding is used more frequently in industrial processes because it has a wider range of applications than traditional welding because less heat is generated because the beam is so concentrated. This means that much less heat is transferred to the workpiece, the metallographic structure is less affected, and the weld quality is much higher than with conventional forms of welding.
Hand laser welding process parameters
1. Laser pulse waveform
Laser pulse waveform is an important issue in laser welding, especially for sheet metal welding. When the high-intensity laser beam hits the surface of the material, 60~98% of the laser energy will be lost by reflection on the metal surface, and the reflectivity will change with the surface temperature. During the laser pulse, the reflectivity of the metal changes greatly.
2. Power density
Power density is one of the most critical parameters in laser processing. Higher power density that heats the surface layer to boiling point in microseconds and produces a lot of vaporization. Therefore, high power density is beneficial for material removal processes such as punching, cutting and engraving. For lower power densities, it takes a few milliseconds for the surface layer temperature to reach the boiling point, and before the surface layer evaporates, the bottom layer reaches the melting point and a good fusion weld is easily formed. Therefore, when performing laser welding, the power density ranges from 10 4 to 10 6 W/cm 2 .
3. Laser pulse width
Pulse width is one of the important parameters of manual laser welding. It is not only an important parameter different from material removal and material melting, but also a key parameter that determines the cost and volume of processing equipment.
How to Choose a Hand Held Laser Welding Machine?
2022 06/17