Radiation detection and positioning device for circumferential weld of small diameter pipe and operation method thereof

Abstract

The invention discloses a small-diameter pipe annular welding seam ray detection positioning device, which comprises a laser indicator, a regulating unit and a fixing clamp, wherein the regulating unit consists of a first regulating unit and a second regulating unit; the laser indicator consists of a unidirectional laser indicator and a bidirectional laser indicator; the unidirectional laser indicator is arranged on the first regulating unit; the bidirectional laser indicator is arranged on the second regulating unit; the first regulating unit is fixedly connected with the second regulating unit; the fixing clamp is arranged on the second regulating unit. The structure is delicate; three steps including positioning point selection, equipment installation and focal distance positioning and angle positioning are used in the positioning process; the accuracy of laser rays is utilized for completing the ray machine arrangement; the operation can be completed by a single person; the operation is simple and convenient; the calculation is not needed; the angle formed by the welding seam cross section and the center line in a directional X-ray machine radiation field and an ellipse opening width can be fast simulated; the work efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of small-diameter pipes, in particular to a small-diameter pipe circumferential weld seam radiographic detection and positioning device and an operating method thereof. Background technique [0002] At present, for the small-diameter tubes known in the field of non-destructive testing, the standards require that the maximum distance between the upper and lower projections of the elliptical opening width formed on the film should be 3 mm to 10 mm. Calculate the distance formula, Lo=[ F-Do+Δh ]×b+q / Do+Δh, F--focal length, Do--outer diameter of small-diameter pipe, Lo--eccentricity, Δh-- weld reinforcement, b—the width of the weld, q—the opening width of the ellipse and the distance in the direction of the minor axis of the ellipse image. If you want to measure and calculate small-diameter tubes of different types and specifications, it will greatly increase the working time. [000...

AI Technical Summary

Problems solved by technology

[0003] After the calculation, the inspector still needs to adjust the angle with eyes or a thin line based on experience for each inspection, which is time-consuming and because of the slight change in the angle during the operation, the width of the elliptical opening of the small-diameter pipe weld on the film will vary. Qualified, resulting in a decrease in the pass rate of the first-time transillumination of the film, and a corresponding increase in engineering costs

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