Phased Array Laser Ultrasonic Testing System

Abstract

The invention discloses a phased array laser ultrasonic detection system, which includes an ultrasonic phased array transmitting system, a receiving system and a control system, and the ultrasonic phased array transmitting system includes a laser component for generating a multi-beam delayed emission optical path, Multi-beam optical path output to form the required array of linear array fiber optic components or area array fiber optic components, the angle of the ultrasonic beam generated by the excitation of the linear array fiber optic component or the area array fiber optic component is adjustable and the focal length is variable. The control system includes a data acquisition card and a The data acquisition card circuit is connected to the computer. The laser ultrasonic phased array technology of the present invention can realize the deflection and focusing of the ultrasonic sound beam at any incident angle in the two-dimensional plane, thereby completing the detection of different depth regions; based on the laser ultrasonic phased array detection technology, the internal flow of the molten pool, Inspection of the inner contour of the molten pool, unfused bottom, internal slag inclusions and pores; the quality of part manufacturing can be achieved by adjusting the printing process through the inspection results.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of additive manufacturing, in particular to a phased array laser ultrasonic detection system. Background technique [0002] Direct energy deposition (Direct Energy Deposition, DED) technology is the mainstream method of metal additive manufacturing. Through laser, plasma, electron beam and other heat sources, a molten pool is generated in the deposition area and moves at a high speed to melt the material powder or wire fed synchronously. Layer-by-layer deposition enables net near-shaping of parts with arbitrary complex shapes. However, due to factors such as unreasonable manufacturing process design, long-term operation stability of equipment, and external environment, metal additive parts inevitably have process defects, which restrict the development and application of metal additive manufacturing technology. [0003] At home and abroad, we have been committed to the research of onli...

AI Technical Summary

Problems solved by technology

However, the monitoring of the internal quality of the molten pool is the key to achieving high-quality printing. Typical defects such as pores, cracks, and unmelted are mostly produced during melting and solidification; the flow state inside the molten pool and the liquid-solid interface transition during melting and solidification closely related to printing parameters

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