This work presents lap welding of zinc coated sheets and leads to the realization of an industrial process. The difficulty comes from the fact that the zinc boiling point (1180 K) is lower than the steel melting point (1800 K) leading to violent boiling of zinc in steel. This creates two kinds of defects: steel droplets that adhere on the top sheet, and holes into the seam, which weaken the join. A two-spots process was chosen: first one concerns the zinc coating vaporization; second one allows welding. Previously, a numerical modelling was developed that permits a process parameters choice and limits the plan of experimentations. Scanning speed, laser power, size and shape of the two spots were optimized. The numerical software leads to the choice of a zinc vaporization elliptic spotlight. Experimentations confirm the predicted tendency. This study shows that designing laser sources is a good way to control the heat supply and then to optimize industrial process, especially those for which constraints on temperatures are required.
Numerical study of zinc coated car body laser welding
Numerische Untersuchung des Laserstrahlschweißens von verzinkten Karosserien
2001
6 Seiten, 6 Bilder, 3 Tabellen, 2 Quellen
Aufsatz (Konferenz)
Englisch
Numerical study of zinc coated car body laser welding
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