Views: 0 Author: Site Editor Publish Time: 2025-09-22 Origin: Site
The automotive body - in - white extensively uses high - strength steel of varying thicknesses (such as hot - formed steel and dual - phase steel ranging from 1.0 - 3.0 mm in thickness). When welding, it is necessary to balance joint strength with vehicle lightweighting. Many car manufacturers are concerned about whether robot - mounted laser welders can be compatible with these different - thickness steels and how the process should be adjusted. In fact, as long as the right equipment is selected and parameters are precisely adjusted, stable welding can be achieved.
The compatibility of robot - mounted laser welders with high - strength steel of different thicknesses lies in the power range of the laser source and the collaborative performance of the robot. Mainstream fiber - laser welders have a power range of 500W - 6000W. When combined with 6 - axis or 7 - axis robots, they can accommodate both precision welding of thin plates less than 1.0 mm in thickness and deep - penetration welding of thick plates over 3.0 mm. For butt welding of the commonly used 1.2 - mm and 2.5 - mm - thick high - strength steels in the body - in - white, a single device can complete the task by adjusting the laser energy and welding path, without the need for frequent equipment changes.
Process adjustment should revolve around three cores: "energy matching, path adaptation, and auxiliary support." First is the adjustment of laser energy parameters: when thickness increases, it is necessary to boost laser power and extend welding time. For example, for welding 1.5 - mm - thick high - strength steel, a power of 2000W and a speed of 1.2 m/min are used, while for welding 2.8 - mm - thick steel, the power needs to be adjusted to 3500W and the speed to 0.8 m/min. At the same time, defocusing should be optimized. Thin plates commonly use positive defocusing (the laser focus is above the workpiece) to reduce burn - through, while thick plates use negative defocusing (the focus is inside the workpiece) to deepen penetration.
Second is the adjustment of welding path and posture. The robot needs to adjust the welding torch angle according to the difference in steel plate thickness. When the thickness difference of the butt - welded steel plates exceeds 0.8 mm, the welding torch should be tilted 5° - 10° towards the thicker plate side to ensure that the energy is concentrated in the fusion zone. For different - thickness steels at curved or corner areas, the robot's motion trajectory needs to be set with smooth transition points to avoid speed changes that can cause uneven weld seams.
Finally, there is auxiliary process support. When welding thick - plate high - strength steel, inert gas (such as argon) protection can be used, with a flow rate controlled at 15 - 25L/min to prevent weld seam oxidation. If there is scale on the surface of the steel plate, the laser pre - treatment function can be activated to remove impurities before welding, thereby improving the fusion quality. In addition, through the vision system mounted on the robot to monitor the thickness changes of the steel plate in real - time, the preset parameter library can be automatically called to achieve quick switching welding for different - thickness steels.
If you have welding machine requirements, please contact Ms. Zhao
E-Mail: pdkj@gd-pw.com
Phone: +86-13631765713
