Length of one transillumination calculation in pipeline welds based on DDA detection method

Taking the digital detector array (DDA) detection technology as the research object, length of one transillumination of longitudinal seam transillumination, girth weld center transillumination, girth weld source external double-wall single shadow transillumination, girth weld source inside single wall single shadow transillumination in digital X-ray inspection of pressure pipeline were deduced and calculated, which provided a theoretical basis for the DDA detection of pressure pipeline welds.