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Method and laser welding device for deep welding a workpiece, injecting a laser beam into the capillary opening produced by another laser beam

A deep penetration welding and laser beam technology, applied in the field of deep penetration welding workpieces, can solve problems such as environmental pollution, weld weakening, material loss, etc., and achieve the effects of reduced spatter formation, reduced heat transfer, and reduced flow speed

Pending Publication Date: 2019-07-05
TRUMPF LASERSYST FOR SEMICON MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liquid workpiece material is flung out of the molten pool, which introduces notches in the weld seam and leads to material loss in the weld seam, whereby the weld seam is mechanically weakened and also pollutes the environment

Method used

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  • Method and laser welding device for deep welding a workpiece, injecting a laser beam into the capillary opening produced by another laser beam
  • Method and laser welding device for deep welding a workpiece, injecting a laser beam into the capillary opening produced by another laser beam
  • Method and laser welding device for deep welding a workpiece, injecting a laser beam into the capillary opening produced by another laser beam

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Embodiment Construction

[0050] In laser beam deep penetration welding, a small steam hole (keyhole) is moved through the liquid molten pool by the relative motion between the laser beam and the workpiece. In this case, when the feed rate is too high, a large amount of molten spatter breaks off and reduces the quality of the weld seam by forming notches.

[0051] In conventional laser beam deep penetration welding, most of the laser energy is absorbed in the upper region of the steam pinhole. In this zone, the laser beam encounters the workpiece for the first time. Usually the combustion plane is also positioned here. Correspondingly, the position of maximum power density is also located here.

[0052] As the absorbed energy increases, the melt flow dynamics increase and, when a critical value is reached, the above-mentioned negative effects occur, which lead to mass loss in the gap and / or a pronounced circulating solution flow behavior.

[0053] If a laser beam with a very good beam quality (also ...

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Abstract

The invention relates to a method for deep welding a workpiece (2), a surface of the workpiece (2) being irradiated by a first laser beam (11) and a second laser beam (12). In a workpiece surface plane (OE) a first beam width B1 of the first laser beam (11) is larger than a second beam width B2 of the second laser beam (12) and in at least said workpiece surface plane (OE) the second laser beam (12) lies inside the first laser beam (11). The intensity of the first laser beam (11) alone is sufficient to produce a keyhole (6) in the workpiece (2). The keyhole (6) produced in the workpiece (2) has a width KB in the workpiece surface plane (OE), KB substantially equalling B1, and B2 <= 0,75*KB. The method according to the invention devises a laser deep penetration welding method which allows good seam quality, high penetration depth and high welding speed. The application also relates to a laser welding device.

Description

technical field [0001] The invention relates to a method for deep penetration welding of workpieces, wherein the surface of the workpiece is irradiated with a first laser beam and a second laser beam, wherein, in the plane of the workpiece surface, the beam width B1 of the first laser beam is greater than the beam width B2 of the second laser beam and, at least in the plane of the workpiece surface, the second laser beam is located within the first laser beam. Background technique [0002] This method is known from US 2006 / 0157457 A1. [0003] With laser beam welding, workpieces can be joined to each other in narrow weld seams at relatively high speeds. Only relatively little heat is introduced into the workpiece, so that no or only minor thermal deformations occur. [0004] During laser deep penetration welding, the workpiece material is not only melted on the surface, but forms small steam holes in the molten pool along the irradiation direction. As a result, the laser ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/06B23K26/242
CPCB23K26/0608B23K26/0613B23K26/242
Inventor P·奥格N·斯佩克
Owner TRUMPF LASERSYST FOR SEMICON MFG