A laser-assisted TIG welding apparatus and method for Invar alloys

By employing a laser-assisted TIG welding method, utilizing laser sensors and adaptive models to optimize the welding process, and combining galvanometer laser remelting and filler wire repair technology, the problem of incomplete fusion defects in multi-layer, multi-pass welding of Invar alloy molds has been solved, improving welding quality and precision. This method is suitable for the manufacturing of aerospace composite material molds.

CN117245219BActive Publication Date: 2026-05-26NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Filing Date
2023-10-25
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Invar alloy molds are prone to incomplete fusion defects during multi-layer, multi-pass TIG welding, especially at the bevel and between layers where effective welding is difficult to achieve.

Method used

A laser-coordinated TIG welding method is adopted, which uses a laser sensor to collect the surface contour information of the weld, uses a computer control system and an adaptive model to formulate a repair strategy, and combines galvanometer laser remelting and filler wire repair technology to optimize welding process parameters to reduce incomplete fusion defects.

Benefits of technology

It effectively reduces the lack of fusion defects in multi-layer, multi-pass TIG welds of Invar alloys, improves welding quality and precision, and is suitable for the manufacture of aerospace composite material molds.

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Abstract

This invention discloses a laser-assisted TIG welding device and method for Invar alloys, applicable to multi-layer, multi-pass welding of Invar alloys. The method includes: after each single-layer welding is completed, a laser sensor emits a linear laser to collect the weld surface contour line by line and transmits the data to a computer control system; the computer control system processes the weld contour information, extracting multiple feature points for each weld contour; the computer control system customizes a repair path based on the feature point location, formulates a repair method for each region based on the feature value, and calls an adaptive model based on a combination of artificial neural networks and genetic algorithms to output welding process parameters; the laser galvanometer welding system receives the repair strategy and sequentially executes the corresponding repair process for the area to be repaired. This invention, through interlayer laser welding repair, can improve the problem of incomplete fusion defects at the bevel and between layers in thick Invar alloys due to their poor flow properties.
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