Prozessstabilität und Prozesseffizienz beim Laserstrahlfügen von hoch reflektiven Kupferwerkstoffen

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Absorption and coupling degree are crucial for stability and efficiency in welding copper materials. Modifying the copper surface through laser structuring or thermal furnace processes significantly enhances process efficiency, allowing energy savings while stabilizing the process flow. The shift from fossil fuels to solar and wind energy, alongside the transition to electric transportation, necessitates various joining techniques. Copper, with its excellent electrical and thermal properties, is essential for this transition. Reliable, automated, and efficient joining technologies, such as laser beam welding, are required for electrical connections. Industrial laser sources used for metal joining emit radiation in the one-micrometer wavelength range, but copper's reflection rate exceeds 90%, meaning only a small portion of the energy is absorbed. Additionally, high thermal conductivity complicates stable vapor capillary formation, reducing efficiency. The interaction between light and matter directly affects absorption and coupling degree, determining the energy utilized for welding. Factors like laser wavelength, temperature, and surface characteristics influence absorption. The coupling degree, representing the ratio of incident to absorbed energy, is also dependent on process management. Increasing absorption and coupling leads to a higher energy share available for melt formation, enhancing efficiency. This work modifies t