Global Patent Index - EP 2961560 A1

EP 2961560 A1 20160106 - METHOD FOR JOINING STEEL PLATES OR STRIPS PROVIDED WITH A METAL COATING TO ONE ANOTHER BY MEANS OF LASER-BEAM WELDING

Title (en)

METHOD FOR JOINING STEEL PLATES OR STRIPS PROVIDED WITH A METAL COATING TO ONE ANOTHER BY MEANS OF LASER-BEAM WELDING

Title (de)

VERFAHREN ZUM ANEINANDERFÜGEN VON MIT EINER METALLISCHEN BESCHICHTUNG VERSEHENEN PLATINEN ODER BÄNDERN AUS STAHL DURCH LASERSTRAHLSCHWEISSEN

Title (fr)

PROCÉDÉ PERMETTANT D'ASSEMBLER DES PLATINES POURVUES D'UN REVÊTEMENT MÉTALLIQUE OU DES FEUILLARDS EN ACIER PAR SOUDAGE AU LASER

Publication

EP 2961560 A1 20160106 (DE)

Application

EP 14704284 A 20140210

Priority

  • DE 102013101953 A 20130227
  • EP 2014000357 W 20140210

Abstract (en)

[origin: WO2014131491A1] The invention relates to a method for joining steel plates or strips (1, 2; 2') provided with a metal coating, such as an Al or Al-Si coating, to on another by means of laser-beam welding, wherein the plates or strips (1, 2; 2') are welded to one another without prior removal of the metal coating from the weld region. According to the invention, in order to economically produce welded joints of flawless quality without prior removal of the metal coating in the weld region, said welded joints being suitable in particular for subsequent hot-forming processes and press-hardening processes, the laser beam (6) is focussed in such a way that the laser beam strikes the weld region with an elongated focus (6'), wherein the elongated focus (6') extends substantially in alignment with the weld (11) and has a length that is at least 1.5 times the width of the weld. The molten phase thereby can be maintained longer, and thus the outgassing time for strength-reducing coating constituents of the plates or strips (1, 2; 2'), particularly aluminium, can be increased.

IPC 8 full level

B23K 26/073 (2006.01); B23K 26/32 (2014.01)

CPC (source: EP)

B23K 26/0732 (2013.01); B23K 2101/34 (2018.08); B23K 2103/08 (2018.08)

Citation (search report)

See references of WO 2014131491A1

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

DOCDB simple family (publication)

DE 102013101953 A1 20140828; EP 2961560 A1 20160106; WO 2014131491 A1 20140904

DOCDB simple family (application)

DE 102013101953 A 20130227; EP 14704284 A 20140210; EP 2014000357 W 20140210