Abstract

The results of applying laser-ultrasonic and acoustic-emission nondestructive testing techniques to study the processes of deformation and fracture of friction-stir-welded joints are presented. The load-strain diagrams were obtained and the mechanical characteristics of the samples of welded joints made of an aluminum-magnesium alloy were determined. The laser ultrasonic method, based on the acoustoelasticity effect, was used to measure the mechanical stresses arising in welded joints during uniaxial loading of specimens in the elastic range. Acoustic emission signals arising during the tension strain of the samples of welded joints were recorded. It has been established that the nature of the distribution of the parameters of acoustic emission occurring during the destruction of faulty welded joints has some distinctive features. The activity and total acoustic-emission count were considered as informative parameters under the conditions of static uniaxial loading of the samples of welded joints.

中文翻译：

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激光-超声和声发射方法在搅拌摩擦焊不同变形形成阶段无损检测中的应用

摘要

给出了应用激光-超声和声发射无损检测技术研究搅拌摩擦焊接接头的变形和断裂过程的结果。获得了载荷-应变图，并确定了铝镁合金焊接接头样品的力学性能。基于声弹性效应的激光超声方法被用于测量在弹性范围内试样单轴加载过程中在焊接接头中产生的机械应力。记录在焊接接头样品的拉伸应变期间产生的声发射信号。已经确定，在破坏有缺陷的焊接接头期间发生的声发射参数分布的性质具有一些独特的特征。