Non-destructive testing method for nozzles of small diameter thin wall steel castings
A non-destructive inspection and steel casting technology, which is used in optical testing for flaws/defects, using sonic/ultrasonic/infrasonic waves to analyze solids, material magnetic variables, etc. Can not detect and other problems to achieve the effect of avoiding missed detection
Active Publication Date: 2019-05-17
KOCEL STEEL
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Problems solved by technology
[0006] According to the traditional non-destructive inspection process of steel castings, the defects buried below 2 mm inside the pipe wall cannot be found by magnetic particle inspection, and the blind area of ultrasonic inspection also has a blind area of 5 mm to 6 mm below the pipe wall. However, there is also the problem that the linear defects below the pipe wall cannot be detected. These undetected defects lead to the loss of non-destructive testing data, which brings great hidden dangers to the quality of the workpiece.
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[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.
[0023] see Figure 1 to Figure 4 , the embodiment of the present invention provides a non-destructive inspection method for a nozzle of a small-diameter thin-walled steel casting, comprising the following steps:
[0024] Ultrasonic testing of rough steel castings: roughly grind the outer surface of the steel casting so that the surface roughness of the steel casting is Ra≤6.3μm. The end face 11 of the steel piece is scanned with 100% coverage, the shear wave oblique probe 60 is selected to scan the outer surface 12 of the side wall o...
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Abstract
The embodiment of the invention provides a nondestructive testing method for a small pipe diameter thin-walled steel casting orifice. The method comprises the following steps: ultrasonic detection of a steel casting blank; ultrasonic detection of the steel casting blank after rough processing of an outer surface; processing of an orifice; fine processing of the orifice; detection of the outer surface of the orifice by a yoke method; and detection of an inner surface of the orifice by a liquid permeation process. According to the method provided by the invention, before the wall thickness of the orifice achieves a process demand, working allowance is preserved first, and ultrasonic detection is performed on the outer surface of the working allowance, so that a detection blind region of ultrasonic detection falls into the working allowance, and the all wall thickness of the orifice falls into an effective detection region of ultrasonic waves; and if no defects are detected, the working allowance is removed by processing, so that leak detection caused by the blind region of ultrasonic detection is avoided.
Description
technical field [0001] The invention relates to the technical field of non-destructive testing of steel castings, in particular to a method for non-destructive testing of nozzles of small-diameter thin-walled steel castings. Background technique [0002] The traditional non-destructive testing process of steel castings adopts the method of magnetic particle inspection combined with ultrasonic longitudinal wave straight probe inspection. [0003] Magnetic particle inspection is used to inspect opening defects on the surface of castings, or defects buried near the surface of castings. The effective detection depth is usually within 2mm below the detection surface. Therefore, internal defects of castings cannot be found when magnetic particle inspection is used. [0004] When the ultrasonic longitudinal wave straight probe is used to inspect the internal defects of castings, there is an inspection blind area of 5mm to 6mm below the detection surface, and there are points of m...
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IPC IPC(8): G01N29/04G01N27/84G01N21/91
CPCG01N21/91G01N27/84G01N29/04
Inventor 李磊拓凌玺征立刚项鹏
Owner KOCEL STEEL