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Laser spot welding of overlapping aluminum workpieces

A laser welding and workpiece technology, applied in laser welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of high cost of consumables, long time, etc.

Inactive Publication Date: 2018-08-03
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such mechanical fasteners take longer to seat and have high consumable costs compared to laser welded joints

Method used

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  • Laser spot welding of overlapping aluminum workpieces
  • Laser spot welding of overlapping aluminum workpieces
  • Laser spot welding of overlapping aluminum workpieces

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Effect test

Embodiment Construction

[0027] The disclosed method of laser welding a workpiece stack consisting of two or more superimposed aluminum workpieces requires advancing a laser beam along a spot weld travel pattern relative to the plane of the top surface of the workpiece stack. The disclosed spot weld travel pattern includes one or more non-linear inner weld paths surrounded by a perimeter outer weld path. Any type of laser welding device, including remote and conventional laser welding devices, may be employed to advance the laser beam relative to the top surface of the workpiece stack. Depending on the properties of the aluminum workpieces to be joined and the laser welding device used, the laser beam can be a solid state laser beam or a gas laser beam. Some notable solid-state lasers that can be used are fiber lasers, disk lasers, and Nd:YAG lasers, and notable gas lasers that can be used are CO 2 laser, but of course other types of lasers can be used as long as they are able to create the keyhole a...

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Abstract

A method of laser welding a workpiece stack-up (10) that includes at least two overlapping aluminum workpieces (12, 14) comprises advancing a laser beam (24) relative to a plane of a top surface (20)of the workpiece stack-up (10) and along a spot weld travel pattern (74) that includes one or more nonlinear inner weld paths and an outer peripheral weld path that surrounds the one or more nonlinearinner weld paths. Such advancement of the laser beam (24) along the spot weld travel pattern (74) translates a keyhole (78) and a surrounding molten aluminum weld pool (76) along a corresponding route relative to the top surface (20) of the workpiece stack-up (10). Advancing the laser beam (24) along the spot weld travel pattern (74) forms a weld joint (72), which includes resolidified compositealuminum workpiece material derived from each of the aluminum workpieces (12, 14) penetrated by the surrounding molten aluminum weld pool (76), that fusion welds the aluminum workpieces (12, 14) together.

Description

technical field [0001] The technical field of the present disclosure relates generally to laser welding, and more specifically, to methods of laser spot welding together two or more stacked aluminum workpieces. Background technique [0002] Laser spot welding is a metal joining process in which a laser beam is directed at a stack of metal workpieces to provide a concentrated energy source that enables a welded joint between the stacked constituent metal workpieces. In general, two or more metal workpieces are first aligned and stacked relative to each other such that their abutment surfaces overlap and face each other to establish an abutment interface (or a plurality of abutment interfaces) within a desired weld location. The laser beam is then directed at the top surface of the workpiece stack. The heat generated by the absorption of energy from the laser beam induces melting of the metal workpieces and establishes a weld puddle within the stack of workpieces. The weld p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/22B23K26/32B23K26/082
CPCB23K26/082B23K26/22B23K26/32B23K2103/10
Inventor 杨上陆W.陶J.张J.A.沃尔斯克
Owner GM GLOBAL TECH OPERATIONS LLC