Butt joint weldment defect spatially positioning method and butt joint weldment

The invention discloses a butt joint weldment defect spatially positioning method. The butt joint weldment defect spatially positioning method can achieve spatial positioning of defects in welding line areas and comprises, firstly, adding an auxiliary block to a flat butt joint weldment to convert the flat butt joint weldment into a T-shaped joint; secondly, according to the added auxiliary block,rotating the butt joint weldment leftward and rightward to obtain the geometric relation of parts of an X-ray detected image and then to establish a defect depth-to-deviation computing mathematical model; thirdly, determining the depth and deviation of defects according to the defect depth-to-deviation computing mathematical model; lastly, determining the distribution of the defects in the lengthdirection of a welding line after performing defect segmentation and defect detailing to achieve the spatial positioning of the defects inside the butt joint weldment. The butt joint weldment defectspatially positioning metho