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小径(外径<76mm)对接焊缝X射线探伤,一般采用的是双壁双投影椭圆成象法,用这种方法透照出的底片,由于射线源侧焊缝与胶片倘焊缝距
Path (diameter <76mm) butt weld X-ray inspection, the commonly used is the double-wall double projection ellipse imaging method, this method through the negative film, the source side of the weld and the film if the weld seam