公开(公告)号：EP3520945A1

公开(公告)日：2019-08-07

申请号：EP18155157.3

申请日：2018-02-05

申请人： Ningbo Geely Automobile Research & Development Co. Ltd.

发明人： MALMBERG, Niklas ,  KAJSJÖ, Kenneth ,  ENBOM, Robert

IPC分类号： B23K1/005 ,  B23K26/08 ,  B23K1/19 ,  B23K103/04

摘要： The present disclosure relates to a process for joining a first metal workpiece (1) and a second metal workpiece (2) by laser brazing for forming a vehicle structure. The process comprises:
providing the first metal workpiece (1) and the second metal workpiece (2) in contacting relationship so as to form an elongated contact region (3), wherein at least one of the first and second metal workpieces (1, 2) is made of hot-dip galvanized steel material,
supplying a laser beam (7) having a beam parameter product lower than 10 mm·mrad from a laser source (4),
guiding the laser beam (7) through a laser focus head (5) having a total optical magnification in the range of 1:0.5 - 1:1.5,
directing the laser beam (7) along the elongated contact region (3), wherein a beam spot (8) formed where the laser beam (7) hits the contact region (3) has a size in the range of 2 - 6 mm, and
supplying a consumable wire (9) of filler material to the beam spot (8) to melt the consumable wire (9) and braze said first and second metal workpieces (1, 2) together, wherein the consumable wire (9) comprises at least 95% copper.

The present disclosure also relates to a vehicle comprising a roof panel (43) and a side panel (35)
that have been mutually joined by said process.