Method for detecting and analyzing defects of welded joint of metal pipe

Abstract

The invention discloses a method for detecting and analyzing defects of a metal pipe welding joint, and belongs to the technical field of metal welding performance detection. A metal pipe is used as a sample to be detected, the metal pipe comprises a non-welding area and a welding area, and the junction of the non-welding area and the welding area is a transition area; carrying out longitudinal dissection on a welding seam of the welding area to obtain a to-be-detected area; a field emission electron probe is used for observing and analyzing the weld appearance of the to-be-detected area, and whether non-penetration welding and / or welding cracks exist in the weld appearance or not is judged; if yes, detection is ended, and if not, element segregation analysis and inclusion analysis are conducted on the to-be-detected area through the field emission electron probe and the X-ray spectrometer. According to the method, macroscopic analysis and microscopic analysis are combined, the microscopic crack condition, the element segregation condition, the non-metallic inclusion defect condition and the like of the welding area of the metal pipe can be comprehensively judged, and the method is a lossless and high-precision detection and analysis method.

Images