Connection status evaluation in arc stud weld joints by ultrasonic detection

Abstract

Precise mechanical ultrasonic scan detection is used in this study for evaluating the connection status of arc stud weld (ASW) joints. The study reveals the relationship between different connection states of ASW joint and ultrasonic scan eigenvalues in time domain, frequency domain, and time–frequency domain. The analysis results in time domain and frequency domain show that according to the amplitude of the first echo from the bottom of the steel plate in time domain and the amplitude at the main frequency of 1.25 MHz in frequency domain, the ASW joint can be identified from the base metal. The analysis in time–frequency domain shows that according to the amplitude of the specific high frequency, the weak connection zone can be identified from the ASW joint. This lays a foundation for the identification of ASW joint fusion zone and has positive significance in practical applications.