Phased array laser ultrasonic detection system

Abstract

The invention discloses a phased array laser ultrasonic detection system, which comprises an ultrasonic phased array transmitting system, a receiving system and a control system, wherein the ultrasonic phased array transmitting system comprises a laser assembly for generating multiple beams of optical paths subjected to delayed emitting, and a linear array optical fiber assembly or an area array optical fiber assembly for outputting the multiple beams of optical paths to form a desired array, the ultrasonic beams generated by excitation by the linear array optical fiber assembly or the area array optical fiber assembly has an adjustable angle and variable length, and the control system includes a data collection card and a computer connected to the data collection card by a circuit. A laser ultrasonic phased array detection technology can realize deflection and focusing of an ultrasonic sound beam in a two-dimensional plane at any incident angle, thereby completing detection in regionsat various depths; based on the laser ultrasonic phased array detection technology, the checking of the internal flow of a molten pool, the inner contour of the molten pool, a non-fused part of a bottom, internal slags and gas holes can be realized; the manufacturing quality of a part can be achieved by adjusting a printing process through a detection result.

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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