Method and system for optimizing process parameters for pore inhibition in high-power laser shaping welding

Patent metadata

Field	Value
Publication number	US-2025289078-A1
Application number	US-202519033372-A
Country	US
Kind code	A1
Filing date	Jan 21, 2025
Priority date	Mar 15, 2024
Publication date	Sep 18, 2025
Grant date	—

Abstract

The disclosure belongs to the technical field of high-power laser welding, and discloses a method and system for optimizing process parameters to suppress pores in high-power laser shaping welding. The method includes: obtaining the relationship between the adjustable annular laser beam diameter, the linear energy at the center point, with welding process parameters; and establishing optimization constraint conditions for them; obtaining the preset range of process parameters and substituting parameter values within this range into the optimization constraint conditions; the process parameter combinations that meet both optimization constraint conditions are the optimized process parameters. This disclosure, by flexibly adjusting the power ratio of the central Gaussian beam and the outer annular beam, significantly improves the pore problem in laser welding of aluminum alloys while ensuring large penetration depth, providing reference for high-quality welding of aluminum alloys.

First claim

What is claimed is:

1 . A method for optimizing process parameters for pore inhibition in high-power laser shaping welding, comprising:
a first step, obtaining a relationship between an adjustable annular laser beam diameter as well as center point linear energy and welding process parameters; a second step, establishing optimization constraint conditions for the adjustable annular laser beam diameter and the center point linear energy; and obtaining preset ranges of the process parameters; and a third step, substituting process parameter values within the preset ranges into the optimization constraint conditions for the adjustable annular laser beam diameter and the center point linear energy, and then combining the process parameters that simultaneously satisfy the optimization constraint conditions for the adjustable annular laser beam diameter and the center point linear energy as optimized process parameters; obtaining a reference ISO 11146-1:2021(en) standard for the relationship between the adjustable annular laser beam diameter and the welding process parameters, for any spot laser beam, and defining D4σ as a beam diameter, wherein a calculation method is to solve a second-order moment of an intensity distribution function by using laser beam intensity information, and detailed calculation steps are as follows: obtaining a light intensity distribution E (x, y) of an entire adjustable annular beam by adding a center Gaussian beam of intensity E c (x, y) and an outer ring annular beam of intensity E r (x, y):

E
⁡
(

x
,
y

)

=

E
c

(

x
,
y

)

+

E
r

(

x
,
y

)

Center coordinates (x c , y c ) of the beam may be calculated as follows:

x
c

=

∫

-
∞

∞

∫

-
∞

∞

x
·

E
⁡
(

x
,
y

)

⁢
dxdy

∫

-
∞

∞

∫

-
∞

∞

E
⁡
(

x
,
y

)

⁢
dxdy

y
c

=

∫

-
∞

∞

∫

-
∞

∞

y
·

E
⁡
(

x
,
y

)

⁢
dxdy

∫

-
∞

∞

∫

-
∞

∞

E
⁡
(

x
,
y

)

⁢
dxdy

σ x 2 And σ y 2 represent normalized weighted integrals of a power density distribution, and a calculation formula is as follows:

Assignees

• Univ Huazhong Science Tech

Inventors

• Jiang Ping
• Geng Shaoning
• Shu Leshi
• Li Jianmin

Classifications

• B23K26/0626

  Energy control of the laser beam (B23K26/0622 takes precedence) · CPC title

• B23K26/0734 Primary

  into an annular shape · CPC title

• B23K26/342 Primary

  Build-up welding · CPC title

• B23K26/24

  Seam welding · CPC title