Laser welding method and compressor

The laser welding method with an oscillating beam trajectory addresses issues of V-shaped grooves, gaps, and material cleanliness in compressors, enhancing welding quality and sealing performance by pre-welding and defect repair, suitable for compressors.

JP2026521752APending Publication Date: 2026-07-01SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
SHANGHAI HITACHI ELECTRICAL APPLIANCES CO LTD
Filing Date
2025-02-27
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Laser welding in compressors faces challenges such as inability to apply to conventional V-shaped grooves, mating gaps leading to weld leaks, misalignment causing defects, and material cleanliness issues resulting in pores and explosions, which affect welding quality and efficiency.

Method used

A laser welding method with an oscillating laser beam trajectory that intersects the gap at least twice, using a galvanometer mirror to achieve symmetrical oscillation, ensuring multiple intersections for pre-welding and defect repair, agitating the molten pool to eliminate pores and improve sealing depth.

Benefits of technology

Enhances welding quality by reducing material costs, eliminating pores, and improving sealing performance, allowing larger gaps to be welded with reduced alignment accuracy and increased effective sealing depth.

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Abstract

The present invention provides a laser welding method and a compressor, the laser welding method comprising the steps of: setting a laser beam trajectory including an oscillating trajectory and an oscillating frequency, and the moving speeds of a first welding member and a second welding member; positioning the first welding member and the second welding member such that the oscillating trajectory and the gap to be welded between the first welding member and the second welding member have at least two intersections; and moving the first welding member and the second welding member at the moving speed and activating the laser beam to weld the first welding member and the second welding member along the laser beam trajectory. The laser welding method of the present invention can weld larger gaps by at least two intersections of the oscillating trajectory of the laser beam and the gap to be welded, thereby reducing the positional accuracy between the welding members and simultaneously improving the effective sealing depth of the weld bead and improving the weld sealing performance. The present invention also relates to a compressor.
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