View Through the Laser Optics

4_seelectorICAM LASER_Produktaufnahme  (11)Laser remote welding has arrived at the vehicle manufacturers in the car body construction and is becoming increasingly important. Apart from the technical advantages over the previously used resistance spot welding, laser remote welding is a far more economical and safer process. The quality assurance of machining processes with extreme lighting conditions is a particular challenge. There are no measured values at the welding point, which are simply recorded and can make a statement about the success of the welding. Therefore, the welding can be made only visually. With the quality assurance system seelectorICAM Laser users now have a fully automatic inspection system. It is integrated at the laser remote scanner and immediately evaluates the welding seam after each welding image is taken. By completion of the car body component the OK/NOK assessment is given at once with a complete defect diagnostics and the rejected parts are discharged.
Laser remote welding is much more efficient and able to replace up to ten electrical resistance spot welding systems, while it offers significantly more flexibility for different weld geometries or access in confined spaces. The high speed and precision of scanner optics combined with the flexibility of a robot results in a much faster welding speed. Major advantages are the considerable shortening of lead times and the flexible adaptation to different assemblies. The intelligent HDR camera of the inspection monitoring system looks through the optics of the laser on each completed welding seam and makes an image recording. That means that the weld assessment directly comes from the live image. Special image processing algorithms analyze the images in the camera, so that the required speed of assessment is guaranteed. The result is a clear statement about the strength of the weld. The analysis of the welding takes place immediately after lowering the laser power and allows an overall statement (OK/NOK) directly after the last weld at the part as well as the visualization of  errors and error types for rework. The analyzed data are transmitted to the host computer. The discharge of NOK parts takes place automatically. The extremely high security against incorrect errors is an important success factor. The image analysis provides with the evaluation of a weld as ‘good” (OK) ‘or ‘bad”(NOK)’ additional classifications in error classes (1) low strength of the weld, (2) surface quality insufficient, (3) insufficient welding power of the laser, (4) missing welds (set / actual comparison).
The commissioning of the system takes just a few days. The fast availability of the full camera functionality in series production makes the success of this already established system used on a laser remote welding system in the car-body construction complete. (Source: hema electronic)
Links: hema electronic

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