飞机壁板钛合金T型焊缝的高频超声相控阵检测技术

High Frequency Ultrasonic Phased Array Inspection Technology for T–Shaped Welds of Titanium Alloy in Aircraft Wall Panel

飞机壁板钛合金双束激光焊逐渐成为高性能机身结构的主要连接方式。鉴于壁板焊缝质量要求高、缺陷类型多、焊缝规模大,亟须一种兼顾高效率和高精度的无损检测技术保障其安全性能。本研究提出飞机壁板焊缝的高频超声相控阵检测技术,设计了相控阵超声检测探头及对比试块对焊缝内外部缺陷进行扇扫成像检测,并通过金相方法验证了检测结果。结果表明,高频超声相控阵检测技术可有效检测壁板T型焊缝中的典型内外部缺陷,包括未熔合、气孔、咬边、焊缝成形不良,高频相控阵检测技术的高效率、高精度、直观可靠的特点使其适用于飞机壁板焊缝的无损检测。

Dual-beam laser welding of titanium alloys for aircraft wall panels has gradually become the main connection method for high-performance fuselage structures.In view of the high requirements of wall panel welds,variety of defects,and large-scale welds,there is an urgent need for a non-destructive testing technology that takes into account the characteristics of high efficiency and high precision to ensure its safety performance.The high-frequency ultrasonic phased array inspection technology for the welding seam of aircraft wall panels is proposed in the research.The phased array ultrasonic inspection probe and the contrast test block are designed to perform fan-scan imaging detection of the internal and external defects of the weld seam,and then,the detection is verified by the metallographic method result.The research results show that the high-frequency ultrasonic phased array inspection technology can effectively detect the typical internal and external defects in the wall T–weld seam,including:non-fusion,pores,undercut,poor weld formation.The advantages of high efficiency,high precision,intuitive and reliable characteristics,make it suitable for non-destructive testing of aircraft wall welds.