Heat exchangers cool liquids in various industrial machines. Spatial separation of primary and secondary media makes it possible to make use of the waste heat, which contributes to the efficient utilization of energy resources. However, manufacturing heat exchangers is a time and energy consuming process.
Welding of tube/tube sheet joints can be performed with a special TIG weld head centered in the tube by a pin. The head then welds with a rotating electrode. Over the years this technology has proved to be very reliable. The process is stable and not likely to be disturbed by outside influences due to the solid connection between weld head and workpiece. However, the process is also characterized by high heat input and slow speed yielding to thermal warpage and long process times.
The task is therefore to reduce time and energy consumption during the manufacturing of tube/tube sheet joints. Furthermore, an automated processing is desired for which laser beam welding is principally suitable.