Single-sided, double-sided, multi-angle ultrasonic testing method for welded seams of dissimilar structural types of pipelines

Abstract

The invention provides a single-sided bilateral multi-angle ultrasonic detection method for heterogeneous structure pattern pipe welds. The single-sided bilateral multi-angle ultrasonic detection method comprises the following steps: establishing a 3D model with two multi-angle ultrasonic probes and a to-be-tested pipeline having flange or elbow welds, and allowing two simulated ultrasonic probesto simulate sector scanning at two sides of the simulated welds; recording the positions of two simulated ultrasonic probes on the simulated to-be-tested pipeline; assembling the two multi-angle ultrasonic probes onto a multi-angle bilateral ultrasonic scanning device; carrying out equidistant linear scanning along the circumference of the to-be-tested pipeline, and collecting detection data of the weld at the same time; and analyzing the weld condition of the to-be-tested pipeline having the flange or elbow welds. According to the invention, through simultaneous transmission of multi-angle ultrasonic waves to welds, only equidistant linear scanning is carried out, so dependence on heterogeneous structure pattern and size is reduced, and the positions and sizes of defects in the welds arequickly identified and calculated; thus, higher detection rate and more visual results of weld defects are achieved, the quality detection of the flange and elbow welds are guaranteed, and work efficiency and defect detection capability are greatly improved.

Description

technical field [0001] The invention relates to a pipeline weld seam detection method, in particular to a single-sided, double-sided, multi-angle ultrasonic detection method for pipeline weld seams of different structural types. Background technique [0002] According to the current regulations and standards of my country's petrochemical industry, non-destructive testing is required for welds formed during the installation and repair of oil and gas pipelines to ensure the quality of pipeline welding. [0003] Ultrasonic testing technology has been widely used as the main inspection method in pipeline welding projects in the petrochemical industry because of its simple and fast operation and high sensitivity to the detection of cracks, unfused and other harmful defects. There are a large number of pipe welds of different structural types in petrochemical plants, such as the welds formed between flanges or elbows and straight pipes. According to the national and industry ultra...

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Problems solved by technology

[0013] c) The height is too large, and the site conditions cannot meet the operating space requirements;

[0014] d) The probe holder is prone to physical collision and jamming with the inner arc of the workpiece;

[0015] e) When the surface curvature of the workpiece is greater than the theoretical curvature, due to the limitation of the adjustable screw, the wedge will not be able to fit tightly with the surface of the workpiece, resulting in poor coupling

[0016] Therefore, operators often have to settle for the next best thing, and only place ultrasonic probes on one side of the welds of heterogeneous structural types of pipes for detection by the method of one side and one side. However, this method is difficult to guarantee the quality of welds and does not meet national standards. Require

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