Detection of defects in girth welded joints of tubular structure by circumferential feature-guided waves

Abstract

The employment of circumferential feature-guided waves (CFGWs) presents a promising and effective avenue for defect detection in girth welded joints of tubular structures. This study delves into the propagation characteristics of diverse CFGW modes utilizing the semi-analytical finite element (SAFE) method. A comparative scrutiny with feature-guided wave (FGW) modes in plate welded joints elucidates how the modal attributes of CFGW modes are impacted by geometric aspects like curvature. Moreover, the research extensively probes the sensitivity of distinct CFGW modes to various defects in girth welded joints through a blend of experimental and numerical approaches. The numerical results align closely with the experimental outcomes, unequivocally affirming the efficacy of CFGWs in defect detection within girth welded joints. The findings reveal that the sensitivity of varied CFGW modes to defects is contingent upon the energy flow distribution across the cross-section of the girth welded joint. This investigation underscores the potential of CFGWs for precise, long-range defect screening at the joint region of girth welded joints in tubular structures.