Laser welding is the use of extremely high energy density of laser beam to fuse materials, with advantages of high welding speed, high intensity, narrow welded joint, small heat affected zone, workpiece small deformation, less subsequent processing and high flexibility. Laser welding can weld not only common carbon steel and stainless steel, but also weld fabricated steel, aluminum, copper and other metals, and various forms of Welding seam can be welded.
For modern sheet metal fabrication, there are more and more high quality requirements to welding strength and appearance effects. Especially for high-value and high quality requirements for welding components can be used without further processing or a few ways to accomplish subsequent processing. The conventional welding methods, due to the maximum heat input, it will inevitably bring the workpiece distortion problem. To compensate for this problem, requires a lot of follow-up processing, thereby increasing expenses.
Laser welding with minimal heat input and heat affected zone is extremely small. Significantly improving the quality of welding products, the follow-up processing time can be reduced. Further, since the high welding speed and the welding depth to width ratio, welding efficiency and stability can be greatly improved. Therefore, laser welding in sheet metal manufacturing is more and more common.
Modern sheet metal production processes
As the laser welding heat input is very low, the amount of deformation after welding is very small, and can get very beautiful weld surface effect, so very little follow-up treatment of welding. Labors on polishing and flattening process can be greatly reduced or canceled. This is especially practical significance for labor costs rising today. Laser welding is confined within the safety shield, and is equipped with automatic dust extraction device, ensuring the health and safety of employees, and keep clean and tidy work environment.
Laser welding: combined tools
In modern sheet metal manufacturing, different products have different quality requirements on welding strength and welding appearance. For example, elevators, kitchen utensils, food equipment exterior parts, need very beautiful, smooth, no distortion welding results. While some internal structure or parts that need subsequent coating, have higher requirements on welding speed and weld strength. And this is precisely to demonstrate the advantages of laser welding. laser welding can achieve not only the beautiful weld of heat conduction welding, but also can achieve deep penetration welding with high weld strength and high welding speed.
Adopt laser welding friendly design optimization of sheet metal production processes
Compared with traditional welding, laser welding advantage is obvious. But laser welding has relatively high requirements for the workpiece machining accuracy and fixture. To maximize the advantages of laser welding, reduce production costs and improve production efficiency, the whole sheet metal production processes including product design, laser cutting, punching, bending and laser welding need to optimize.
We found that in actual production, the cost of sheet metal products those use laser welding technology, laser welding step is not the primary determinant. Actual production experience has shown that 70% of the cost of sheet metal products is determined by the product design. To reduce production costs, improve the welding efficiency, first need to start from the product design. In the initial product design to take into account the requirements of the laser welding of the workpiece, such as reducing the production bend sequence, try using laser cutting sheet metal, using a self-positioning design, etc. Therefore, laser welding process and fixture becomes very simple and reduces costs and improves efficiency.