Abstract
Composite workpieces, especially the complex-curved surfaces composite workpieces, have been increasingly used in different industries. Non-destructive testing of these parts has become an urgent problem to be addressed. To solve the problem, this article presents a dual-robot air-coupled ultrasonic non-destructive testing scheme and introduces the structure of the system and a general calibration method for the workpiece frame of a dual-robot system in detail. Importantly, this article proposes a tangential constraint method, which makes the probes completely aligned during the inspection process. Verification experiments and ultrasonic testing experiments for a glued multilayered composite workpiece were performed using the dual-robot air-coupled ultrasonic non-destructive testing system. A comparative experiment was also performed using a dual-robot water jet-coupling ultrasonic testing system. Experimental results show that the dual-robot non-destructive testing scheme and the tangential constraint method function well, and all the artificial defects on the sample can be detected by both kinds of testing methods. Vivid 3-D C-scan image based on the test result is provided for convenience of observation. In other words, a kind of flexible versatile testing platform with multiple degrees of freedom is established.
Highlights
Non-destructive ultrasonic testing (NDT) is commonly used to test workpieces for defects and properties
The low DOFs ultrasonic testing system cannot meet the requirements of modern industrial NDT
To make full use of the advantages of the air-coupled ultrasonic testing system, an automatic ultrasonic NDT scheme is proposed based on dual-robot synchronous motion technology
Summary
Canzhi Guo1,2 , Chunguang Xu1,2, Dingguo Xiao[1,2], Juan Hao[1,2] and Hanming Zhang[1,2]
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