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Laser welding method

A laser welding, laser beam technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problem of welding part Y that cannot obtain a stable shape, etc.

Active Publication Date: 2015-11-25
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Then, there is a case where a stable shape of the welded portion Y cannot be obtained

Method used

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no. 1 approach

[0050] 1. About device configuration

[0051] FIG. 1 is a schematic diagram of one example of a welding apparatus for performing laser welding methods according to first to third embodiments of the present invention. Figure 1A is a view along the transverse direction of the fusion state of the nugget, and Figure 1B is a frontal view of the welded state of the nugget.

[0052] The welding apparatus shown in FIG. 1 includes a laser beam irradiation section 1 as a main component. The laser beam irradiation section 1 is a device that supplies laser beams (first laser beams or second laser beams) L1, L2 for welding and projects the selected laser beams onto two metal workpieces W1, W2, which The metal workpieces W1, W2 are stacked or arranged with a slight gap therebetween.

[0053] In the present embodiment and the second embodiment, only the welding laser beam (first laser beam L1 ) for forming each nugget N constituting the welding portion is used. In the third embodiment,...

no. 2 approach

[0087] 4 includes views for explaining a laser welding method according to a second embodiment, in which, Figure 4A showing a virtual closed curve on the workpiece and an irradiation area of ​​the first laser beam before the first laser beam is projected onto the workpiece, Figure 4B shows the relationship between each of the irradiated areas and the total heat input, and Figure 4C Shows the state of the nugget.

[0088] This embodiment differs from the first embodiment in that the first laser beam L1 is Figure 4A The images shown are projected onto the shot regions P1 to P6 in order, thereby forming nuggets N1 to N6 in order.

[0089] In this embodiment, if Figure 4A As shown in , the center of a circle passing through the irradiation area P1 to the irradiation area P6 (the nugget N1 to the nugget N6 ) is determined, and the outer peripheral diameter of the closed curve D corresponding to the circumference is set. Next, the first laser beam L1 follows the Figure 2A...

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Abstract

A laser welding method includes: projecting a laser beam onto irradiation regions on plural metallic workpieces such that a weld section is formed when the workpieces are joined by laser welding, the weld section being formed of plural nuggets, and each of the irradiation regions being formed with each of the nuggets. The nuggets are sequentially formed by sequentially projecting the laser beam onto the irradiation regions that respectively correspond to the nuggets. The laser beam is projected onto each of the irradiation regions such that an amount of input heat from the laser beam that is projected onto each of the irradiation regions to the workpiece is reduced as the nuggets are sequentially formed.

Description

technical field [0001] The present invention relates to a laser welding method suitable for joining a plurality of workpieces by performing welding using a laser beam. Background technique [0002] A laser welding method has been widely used as a method for joining a plurality of metal workpieces in a state where these workpieces are stacked or abutted. Welding by the laser welding method has the following advantages: less processing deformation, high-speed welding capability, less residual heat affected parts, and the like. [0003] As such a technique, for example, Japanese Patent Application Publication No. 2013-132686 (JP 2013-132686A) proposes a laser welding method for joining workpieces formed of a plurality of stacked metal plates. Here, in order to join the workpieces, a laser beam is projected onto the workpieces so that a welded portion composed of a plurality of nuggets is formed, thereby joining the workpieces W1. [0004] More specifically, as Figure 10A As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/08B23K26/70
CPCB23K26/22B23K26/082B23K26/08B23K26/20
Inventor 久田幸平日置亨牧野润一郎尾楠和幸中田征宏
Owner TOYOTA JIDOSHA KK
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