Method for positioning weld of heat insulation pressure-carrying pipeline based on X-ray digital imaging detection

Abstract

The invention discloses a method for positioning a weld of a heat insulation pressure-carrying pipeline based on X-ray digital imaging detection. The method is characterized by comprising the following steps of 1, according to the outer diameter of the pressure pipeline and the thickness of a heat insulation layer, preliminarily evaluating the position of the weld, and correspondingly putting a ray machine and an imaging board at the position capable of imaging the preliminarily evaluated weld position; 2, adjusting the tube voltage and exposure time of the ray machine for shooting, so as to obtain a detection image; 3, according to the situation of the obtained detection image in step 2, and the convex contour caused by the weld reinforcement, judging the position of the weld, and further adjusting the angles and bearings of the ray machine and the imaging board, so as to perform the X-ray digital imaging detection. The method has the advantages that the weld of the heat insulation pressure-carrying pipeline can be quickly positioned, the economic loss due to detachment of the heat insulation layer is avoided for an end user, the labor intensity of detectors is decreased, and the detection efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of welding seam positioning methods for pressure pipes with heat preservation, in particular to a method for locating weld seams for pressure pipes with heat preservation based on X-ray digital imaging detection. Background technique [0002] Due to the ability to perform real-time imaging without removing the insulation layer, X-ray digital imaging detection technology has been applied to the detection of pressure pipelines with insulation. However, in the process of X-ray digital imaging detection of pressure pipes with insulation layer, it is faced with the problem of difficult positioning of weld seams. figure 1 And attached figure 2 As shown, the inspection workload is greatly increased, and sometimes the inspectors even have to remove the insulation layer to obtain the exact position of the weld. This method is not only time-consuming and laborious, but also increases the inspection cost of the owner...

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Problems solved by technology

[0004] Based on the deficiencies of the prior art, the object of the present invention is to provide a method for locating the weld seam of a pressure pipeline with thermal insulation based on X-ray digital imaging detection, to solve the problem of weld seam occurrence in the process of X-ray digital imaging detection of pressure pipeline with insulation layer. Difficult positioning problem

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