Methods for detecting austenitic weld based on ultrasonic-magnetic combination technique

A method for detecting an austenitic weld based on an ultrasonic-magnetic combination, comprising:

• step 1, dividing the austenitic weld into a plurality of zones along a thickness direction to obtain divided zones;
• step 2, detecting the divided zones based on the ultrasonic-magnetic combination;
• wherein the ultrasonic-magnetic combination is a combination of phased array ultrasonic testing (PAUT) and weak magnetic detection, the PAUT including longitudinal wave scanning and shear wave scanning;
• wherein the detecting the divided zones based on the ultrasonic-magnetic combination includes:
• determining priorities of the PAUT and the weak magnetic detection based on a position of each of the zones, defect type, and a position of a zone in which a defect is located, wherein
• the PAUT includes controlling a PAUT device to adopt non-parallel scan detection or manual zigzag scan detection;
• wherein the non-parallel scan detection refers to scan detection using a probe of the PAUT device by moving parallel to a direction of the austenitic weld;
• and the PAUT device is provided with an encoder;
• the weak magnetic detection includes a manual scan or a mechanical scan, wherein the mechanical scan refers to using a probe of a weak magnetic detection device close to a surface of the austenitic weld by moving parallel to the direction of the austenitic weld, wherein the weak magnetic detection device is provided with the encoder;
• step 3, controlling the PAUT device to perform the PAUT on the divided zones using phased array probe parameters or controlling the weak magnetic detection device to perform the weak magnetic detection on the divided zones, based on the priorities of the PAUT and the weak magnetic detection, including:
• during the PAUT, performing the weak magnetic detection for a non-detectable zone, a difficult-to-detect defect, and an acoustic transparency defect, wherein
• the non-detectable zone for PAUT scanning is defined as a zone that is not detected due to at least one of a structural limitation of an object to be inspected and/or limitations of the applied detection methods;
• the difficult-to-detect defect is a transverse defect of which direction is parallel or approximately parallel to a phased array ultrasonic beam, and
• the acoustic transparency defect includes defects through which ultrasonic waves penetrate without reflection at an interface;
• and
• during the weak magnetic detection, performing the PAUT for zones where confusion defect signals and geometric interference signals appear, wherein
• the confusion defect signals are generated in situations where two defects with same position but different thicknesses are confused, or a large defect is displayed as a plurality of defects, and
• the geometric interference signals are generated by geometrical shapes.