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Nondestructive inspection method for steel casting valve welding groove

A welding groove and non-destructive inspection technology, which is applied in the direction of analyzing solids, instruments, and analysis materials using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as high repair rate, missed inspection, and low work efficiency, so as to ensure inspection quality and reduce Manufacturing cost, the effect of avoiding missed detection

Inactive Publication Date: 2019-09-06
ZHEJIANG KAICHENG MASCH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Welding grooves of cast steel valves generally require very high requirements. Ultrasonic inspection, magnetic particle inspection, and penetration inspection are required during manufacturing. Because the wall thickness and structure of existing valve welding grooves are irregular, see figure 1 and figure 2 , the ultrasonic probe cannot fully touch the groove surface, and there is a blind area, which leads to missed inspection, high rejection rate, high repair rate, resulting in low work efficiency, high manufacturing cost, and poor practicability

Method used

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  • Nondestructive inspection method for steel casting valve welding groove
  • Nondestructive inspection method for steel casting valve welding groove
  • Nondestructive inspection method for steel casting valve welding groove

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Embodiment Construction

[0020] In the description of this embodiment, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", " Outside", "front", "rear", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying Any device or element must have a specific orientation, be constructed and operate in a specific orientation and, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

[0021] see image 3 , a method for non-destructive inspection of welded grooves of steel casting valves disclosed by the present invention, comprising the following steps:

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Abstract

The invention discloses a nondestructive inspection method for a steel casting valve welding groove, which comprises the following steps: (1) a steel casting valve leaves a margin at the groove position during rough machining; (2) an ultrasonic probe is used for inspection from the upper end surface and the side surface; (3) the groove of the steel casting valve is machined to a pre-welding state;and (4) magnetic powder or penetration nondestructive detection is carried out at the groove position. In the above technical scheme, no inspection blind zone exists, the groove is totally in an effective inspection area of ultrasonic inspection, and after inspection for no defect, finish machining to size requirements is then carried out. Thus, missed inspection caused by the ultrasonic inspection blind zone can be avoided, and the inspection quality is ensured.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a non-destructive inspection method for valve welding grooves of steel castings. Background technique [0002] Welding grooves of cast steel valves generally require very high requirements. Ultrasonic inspection, magnetic particle inspection, and penetration inspection are required during manufacturing. Because the wall thickness and structure of existing valve welding grooves are irregular, see figure 1 and figure 2 , The ultrasonic probe cannot fully touch the groove surface, and there is a blind area, which leads to missed inspection, high rejection rate, high repair rate, low work efficiency, high manufacturing cost, and poor practicability. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for non-destructive inspection of welded grooves of steel casting valves that can avoid missed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N27/84G01N21/91
CPCG01N21/91G01N27/84G01N29/04G01N2291/0234
Inventor 李尚充陈国龙金玲敏
Owner ZHEJIANG KAICHENG MASCH CO LTD
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