As a new process, robot controlled laser scanning welding technology plays an important role in ensuring welding quality and improving profit margin. However, its biggest challenge is to have a laser source with the right laser beam quality. Disc lasers developed by TRUMPF not only meet the high beam quality requirements, but can also be used in a variety of laser applications such as cutting, conventional soldering and laser scanning soldering. The traditional solid-state laser welding process is a mature process in the manufacture of automobile bodies. The development of this process has prompted the robot to control the laser scanning welding process. In this new process, the bending movement of the arm is closely related to the dynamic positional movement of the laser scanner, and Audi has pioneered this highly efficient manufacturing technique on the doors of its subsequent products. In addition, TRUMPF has developed dedicated scanning solder joints for industrial applications of high power lasers. At present, only the robot guidance solution developed by the company has passed the rigorous certification test of the German automotive industry and has been applied to its series production (Figure 2). Recently, DaimlerChrysler Automotive began to apply this process to the new body manufacturing process. Volkswagen and Audi's R&D engineers have developed the advantages of laser scanning and welding processes, and Audi has successfully solved various challenges in tooling and component preparation, and today they produce components with superior quality. Audi's experts also developed laser-assisted pretreatment technology to ensure high welding quality of galvanized layer processing components. The laser source used by them is the Nd:YAG pulse laser manufactured by TRUMPF. After a small batch of trials in Passat, the laser scanning welding process and its system components were applied to Volkswagen's range of products in 2005. The high practicality of the system components is verified and the profit margin is increased. Audi has now implemented this process in its range of products. Since the beginning of 2007, the subsequent Audi A4 doors have used laser scanning welding technology and 4 kW disc lasers manufactured by TRUMPF. With this technology, four manufacturing units can produce 1,800 doors per day. Each laser scanning system is the TruDisk 4002 from TRUMPF, which uses the latest disk lasers. The 4kW output of the device is produced by only two discs. Audi's advantage of relying on the laser network allows the lasers to be connected to each other when necessary, making it easy to maximize the use of spares and lasers. TC-RefrigSpin Micro High Speed Refrigerated Centrifuge Micro Refrigerated Centrifuge,High Speed Refrigerated Centrifuge,Micro High Speed Refrigerated Centrifuge Topscien Instrument(Ningbo China)Co.,LTD , https://www.centrifugesupply.com
In the development of robot-controlled laser scanning and welding technology, the biggest challenge is to find a suitable laser beam quality laser source. In conventional laser welding applications, a lamp pump system with a beam quality of 25 mm mrad has a usability of 1 000. With a value greater than 99%, these beam sources set a new practical standard. However, for laser scanning welding, higher beam quality is required because the processing field size of the scanning optics is closely related to the possible operating range and beam quality. It is impossible to improve the beam quality only by changing the shape of the laser bar. Only the novel laser concept can meet the requirements for improving the beam quality. TRUMPF has developed disk lasers for industrial applications and has been widely used worldwide (Figure 1). It is a high power laser with a beam quality of 8 mm mrad and a maximum energy range of 8 kW. Disc lasers can be used in all laser applications, from cutting, conventional soldering to laser scanning soldering. 
Figure 1 TRUMPF's 8kW power output disc laser TruDisk 8002 integrates compressor cooler with maximum six-fiber output 
Figure 2 TRUMPF PFO 33 (Programmable Focusing Optical System)