Laser welding has the advantages of low heat input, small welding deformation, easy automation, and high production efficiency. Compared to conventional arc welding methods, laser welding has unparalleled advantages.
Usually, during the laser welding process, due to the acceleration/deceleration process of the welding platform or welding robot at the beginning and end stages of the movement, if the process optimization is not carried out during the laser's output and off stages, there will be over burning phenomenon at the beginning and end stages of the weld seam. Specifically, the starting part presents a "convex" morphology, and the ending part presents a "concave" morphology, as shown in Figure 1. It has a significant impact on the overall uniformity of the weld seam, not only making it unattractive, but also causing stress concentration in the concave and convex parts, resulting in a decrease in the overall strength of the weld seam.
Therefore, in the actual welding process, this negative impact is generally eliminated by controlling the laser power at the beginning and end stages of the motion. In the initial stage of welding, as the motion mechanism accelerates from stationary to the set welding speed, the power gradually increases from low to high; At the end of welding, as the motion mechanism gradually slows down to a standstill, the laser power gradually decreases. In summary, with the reasonable matching of the laser output power with the movement speed of the mechanism, the concave and convex morphology at the beginning and end of the weld seam can be avoided, as shown in the figure.
The GW laser is equipped with built-in PID control, and the upper computer software of the GW laser can not only monitor various status information in real-time, but also adjust parameters in real-time to achieve closed-loop control of laser output power.
Built-in Ramp mode: It can achieve programming output of any waveform, allowing the laser output power to be adjusted as needed, accurately controlling the linear energy density, not only avoiding the generation of concavity and convexity at the beginning and end of the weld seam, but also achieving welding waveform contour control for specific application processes.
