At the beginning of a welding process, the heat-up phase of the metal is critical to the resultant weld quality. If a defined temperature range exceeded too fast, the risk of cracking is significantly increased.4 During the welding process the thermal supervision of the central processing location is decisive for a high secure weld. In the border areas as well as in connection of the welding process especially cooling processes are crucial for the homogeneity of the results. In order to obtain sufficiently accurate resolution of the dynamic heating- and cooling-processes, the system can carry out up to 500 frames per second.
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B. Lempe, R. Maschke, F. Rudek, T. Baselt, P. Hartmann, "Analysis of weld seam uniformity through temperature distribution by spatially resolved detector elements in the wavelength range of 0.3μm to 5μm for the detection of structural changing heating and cooling processes," Proc. SPIE 9741, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V, 97410U (18 March 2016);