B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/97, 327/1.3
B23K 26/08 (2006.01) B23K 31/00 (2006.01)
Patent
CA 1264820
21421-229 ABSTRACT OF THE INVENTION A process for the butt-welding of especially deep- drawable steel sheets or steel strips galvanized at least on one side, in which the welding seam is protected against corrosion. To obtain a welding seam flush with the sheet and protected again- st corrosion, without the reworking of the welding seam and without the use of filler material, sheets or strips having essen- tially rectangular cut edges with a corrugation in the longitudinal direction of at most 0.4 mm are used. The sheets and strips brought into touch contact with these cut edges are melted in the region of the welding joint by means of a laser beam, of which the focal spot covering the cut edges has a diameter of at most 0.2 mm. Because of the extremely narrow welding gap, the voids are filled by the molten material of the adjacent sheets, without any detectable reduction in the thickness of the sheets or strips. Furthermore, the welding seam is protected against corrosion as a result of the long-range protection effect exerted by the zinc of the adjacent regions.
514523
Frings Adam
Prange Wilfried
Fetherstonhaugh & Co.
Thyssen Stahl Ag
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