A laser welding method for copper plate fillet welds with large effective penetration depth

By using a multimode infrared laser and optimizing welding parameters, the problems of insufficient penetration and poor welding quality in laser welding of copper plate fillet welds have been solved, achieving efficient and low-cost laser welding of copper plate fillet welds.

CN117428337BActive Publication Date: 2026-06-30SUZHOU SITRI WELDING TECH RES INST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUZHOU SITRI WELDING TECH RES INST CO LTD
Filing Date
2023-10-19
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In the existing technology, the laser welding method for copper plate fillet welds has problems such as insufficient effective penetration, low welding strength, high cost and low efficiency. In particular, the equipment cost of blue light and infrared lasers is high, and the high reflectivity of infrared lasers leads to poor welding quality.

Method used

A multimode infrared laser with a total power greater than 6000W is used, combined with tilt angle welding, appropriate welding speed and defocusing amount, chiller cooling and coaxial gas protection, protective lens, and optimized optical configuration to improve penetration depth and welding quality.

Benefits of technology

It achieves an effective penetration depth of more than 1.5mm for copper plate fillet welds, with no obvious spatter or pores in the weld appearance, reducing equipment costs and making it suitable for mass production.

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Abstract

This invention relates to a laser welding method for large effective penetration depth copper plate fillet welds. The method includes: after the corners of the copper plates to be welded are butt-jointed, laser welding is performed along the welding trajectory using a laser welding device under coaxial air blowing protection to form a fillet weld at the corner. The laser welding device uses a multimode infrared laser with a total power >6000W. During welding, the tilt angle between the welding head and the vertical plane is ≥5°, the welding speed is 30-40mm / s, and the defocusing amount is +3mm-+6mm. Using a high-power multimode infrared laser for tilt welding reduces infrared light reflection and avoids damage to the optical configuration. With appropriate welding speed and defocusing amount, there is a large power density and uniform energy distribution, enabling the effective penetration depth to be greater than 1.5mm. It can also take into account the stability of the molten metal pool. The weld appearance has no obvious spatter or pores. It is highly efficient and can significantly reduce equipment costs compared to blue, green, or infrared composite lasers, which is beneficial for mass production.
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