With the increasingly urgent repair demand brought by the extensive application of composites in industrial field

the advanced non-destructive testing and evaluation (NDT E) methods and techniques for composite repairs have been highly concerned in the industry. At present

integrated visual NDT E methods and techniques suitable for different repair scenarios are lacking. A integrated visual NDT E method based on the principle of multimode ultrasound (MU) is proposed. The NDT E requirements and features for composite repair

s situ

off-location and manufacturing scenarios were analysed. A MU visual NDT E method for multi-repair scenarios was constructed. Typical composite repair specimens were prepared. The regularity of ultrasonic signals and images from the composite repaired areas and the visualized detection effect of the developed integrated MU method were revealed experimentally. The results  show that the geometrical topologies of the matrix

repaired zone and repaired edges in the composite body can be clearly identified and quantitatively characterized based on the change characteristics of ultrasonic signals from the repaired composites. Different ultrasonic modes have different visualized imaging effects and defect detection capabilities

among which mono-pulse ultrasonic mode (M

3

) and asymmetric-frequency ultrasonic mode (M

2

) have the best visual imaging quality and defect detection capabilities

while air-coupled ultrasonic mode (M

1

) is obviously inferior to M

2

and M

3

. M

3

has the most imaging details compared with M

1

and M

2

; M

2

and M

3

have the highest accuracy and resolution in detected defects

the smallest surface detection dead-zone

and their sensitivities for detected out delamination and disbonding reach Φ3 mm. The surface resolution of M

2

and M

3

is smaller to a single ply thickness in omposites (about 0.125 mm). The sensitivity of M

1

for detecting delamination and disbonding is close to Φ6 mm. Thus

the integrated MU method and technique provide a powerful and visualized quantitative NDT E approach for composite repairs in different repair scenarios

and have been applied well in practical inspection.