IPG Photonics patented a laser welding head with movable mirrors for precise welding operations, including wobble patterns and seam tracking. The mirrors provide controlled movement within a small field of view, enhancing accuracy. The method involves generating, collimating, reflecting, and focusing a laser beam for welding. GlobalData’s report on IPG Photonics gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on IPG Photonics, Welding robots was a key innovation area identified from patents. IPG Photonics's grant share as of April 2024 was 50%. Grant share is based on the ratio of number of grants to total number of patents.
Laser welding method with movable mirrors for wobble patterns
A recently granted patent (Publication Number: US11964341B2) discloses a laser welding method that involves generating a laser beam, collimating it in a welding head, reflecting the beam from movable mirrors to move it relative to a workpiece within a limited field of view, and focusing the beam on the workpiece for welding. The method also includes moving the welding head or the workpiece while moving the beam, using multiple movable mirrors for beam movement in different axes, controlling the movement to create a wobble pattern during welding, and adjusting laser power based on beam movement or position.
Furthermore, the patent describes the use of a near-infrared laser beam generated from an Ytterbium fiber laser or a fiber laser with active fibers like Er, Th, Ho, doped fibers, or their combinations. It also includes features like following a seam to be welded, detecting the seam location in advance, shaping the collimated beam using diffractive optics, shutting off the laser in response to sensed conditions near the movable mirrors, and delivering gas to the weld site from a gas assist accessory mounted on the welding head. Another aspect of the method involves moving the beam with a wobble pattern in a limited field of view, focusing it on the workpiece, and moving the welding head or workpiece relative to each other to perform welding efficiently.
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