Product Code: ICA10_1005

Welding Zinc Coated Steels: New Joint Design and Strategy with Scanner Technology
Klaus Loeffler, TRUMPF Laser & Systems GmbH; Ditzingen Germany
Tim Hesse, TRUMP Werkzeugmaschinen GmbH; Ditzingen Germany
Peter Kaupp, TRUMPF Laser- und Systemtechnik GmbH; Ditzingen Germany
Presented at ICALEO 2010

The existing problems of weld defects in welidng zinc coated steels in a overlap situation are present in the automotive industry. The root cause is the different melting temperature of zinc and steel. Zinc vapourises already at 900C versus steel melts at 1500C. The result if not taking care of the outgasing are pinholes and crates in the weld seam. Extensive research has been taken on with highspeed cameras to evaluate the root cause. Based on extensive research a new joint design, called k-design has been developed and successful tested. The new design guarantees welds without defects caused by zinc, watertight seams and allows twice the welding speed compared to traditional overlap welds. The presentation will also report on a new strategy to create joints between to zinc coated steel sheets with the use of newest scanner welding technology.

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