JP3314849B2 - Standard specimen for non-destructive inspection and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standard specimen for non-destructive inspection and a method for manufacturing the same, and more particularly to a non-destructive non-destructive standard defect for estimating a defect size in non-destructive inspection. The present invention relates to an inspection standard specimen and a method for manufacturing the same.

[0002]

2. Description of the Related Art The detection of defects in welds occurring during the production of machines and plant equipment and cracks caused by the use of equipment is very important industrially, and the detection methods such as ultrasonic wave, Various flaw detection methods such as eddy current and X-ray transmission are used. However, these flaw detection methods are not always technically satisfactory depending on, for example, the inspection apparatus, the skill of the inspector, or the inspection method, and various improvements have been made.

In order to improve such a flaw detection inspection, in recent years, a standard specimen for objectively judging the ability to detect a defect has been often used with a metal specimen having a known defect size and position. It is used. In addition, with the improvement of the defect detection skills, this standard specimen is required to contain more natural defects, and therefore the method of manufacturing the standard specimen is necessarily improved. Is being required.

[0004] The above-mentioned conventional standard test specimen and its manufacturing method are described in, for example, JP-A-61-215959 and 1990.
Magazine "Light Metal Welding" (Vol. 28, No. 10, No. 4
Pages 31 to 438).

[0005] The example of Japanese Patent Application Laid-Open No. 61-215959 relates to a test piece for evaluating a non-destructive test result for inspecting a defect such as a blowhole generated in a welded portion when welding is performed, and a manufacturing method thereof. As shown in FIG. 3, solid materials b, c, and d such as alumina and carbide were arranged in a weld joint e of the test pieces a and a1, and were filled by welding to make artificial defects inherent. It is a test piece and its manufacturing method.

An example of a magazine "Light Metal Welding" published in 1990 (Vol. 28, No. 10, pp. 431 to 438) relates to the production of a simulated defect specimen for an ultrasonic inspection test. Then, as shown in FIG. 4, a method of forming grooves f in the test pieces a and a1 by machining or electric discharge machining, and then sealing the grooves f by diffusion bonding or electron beam welding g so that defects are contained therein. It is.

[0007]

However, in the test piece of the first conventional example, cracks having very narrow gaps are suitable for simulating welding defects such as slag entrainment and blow holes. Is inconvenient for detecting
In addition, it is difficult not only to manufacture a complicated shape, but also there is a risk that the imperfections may be broken during the subsequent assembling or pressing work, and it is necessary to confirm them again.

In the test piece of the second conventional example, when the bonding surface provided with a groove by machining or electric discharge machining is diffusion bonded by hot isostatic pressing or hot pressing, the size of the groove, particularly If the depth is reduced by the pressing pressure, it is difficult to control the shape, and if the depth of the groove is 10 μm or less, the part is bonded and the defect is eliminated in the test piece. It is not possible to manufacture a test piece having a very narrow defect inside.

The present invention has been devised in view of the above-mentioned problems, and provides a nondestructive inspection standard specimen and a method for manufacturing the same, in which an artificial defect having a very small defect thickness is reliably included. The purpose is to do so.

[0010]

In order to achieve the above object, a non-destructive standard specimen for non-destructive inspection according to the present invention has a non-destructive standard defect in which a standard defect to be compared in estimating a defect size in non-destructive inspection is included. A standard test specimen, which is a ceramic powder kneaded with water or an organic solvent to a size corresponding to the size of the defects existing on one of the joining surfaces of the members constituting the metal standard test sample And seal around the joint surface by electron beam welding, and
The sealed standard specimen is diffusion-bonded by hot isostatic pressing or hot pressing so that artificial defects are inherent in the portion where the ceramic powder is applied.

Further, the method for manufacturing a standard specimen for nondestructive inspection according to the present invention provides a method of manufacturing a standard specimen for metal which has a size corresponding to the size of a defect existing on one of the joining surfaces of the members constituting the standard specimen. Applying a ceramic powder kneaded with water or an organic solvent to the surface, sealing the periphery of the joint surface by electron beam welding, and diffusion-bonding the sealed standard specimen by hot isostatic pressing or hot pressing And a process.

According to the above-described standard specimen and the method of manufacturing the same, the ceramic powder kneaded with water or an organic solvent to the joint surface of the members constituting the standard specimen to a size corresponding to the size of the intrinsic defect. And sealing the periphery of the joint surface by electron beam welding, and diffusion-bonding the sealed standard specimen by hot isostatic pressing or the like, and an artificial defect is present in the portion where the ceramic powder is applied. Since this is done, a standard specimen for nondestructive inspection with a very small defect thickness can be manufactured.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a standard specimen according to an embodiment of the present invention, and FIG. 2 is a perspective view of one member constituting the standard specimen according to the embodiment of the present invention. In the figure, reference numeral 1 denotes a standard specimen made of metal, which is composed of members 2 and 3. Reference numeral 4 denotes a joint surface of the divided member 2, and reference numeral 4a denotes a joint surface of another member 3, which is a joint surface when the members 2 and 3 are joined again. Reference numeral 5 denotes a silica-based ceramic powder (silica sol) kneaded with water or an organic solvent (hereinafter referred to as "water") applied to the bonding surface 4 of the member 2, and the amount (thickness) of the applied powder can be appropriately selected. 6 is the member 2, 3
Is a seal portion in which the periphery of the joint surfaces 4 and 4a is sealed by electron beam welding. The sealed standard specimen is diffusion-bonded by a hot isostatic press or a hot press (not shown) or the like, and an artificial defect is present in a portion where the silica sol is applied. The surface (location) to which the silica sol is applied can be appropriately selected.

In this embodiment, the silica sol 5 is applied to the joining surface 4 of the member 2. However, the silica sol 5 may be applied to the joining surface 4 a of the member 3.
For example, it may be a flake-like substance.

Next, the operation of the embodiment will be described in detail.
The metal standard specimen 1 is composed of members 2 and 3, but is originally divided into two parts by wire electric discharge machining or the like. These two members 2,
The silica sol 5 is applied to the bonding surface of any one of the members 3. After the application, the periphery of the joining surfaces 4 and 4a of the members 2 and 3 is temporarily fixed by spot welding or the like, and then completely sealed by electron beam welding. Then, the standard specimen 1 is further subjected to hot isostatic pressing or hot pressing, for example, at a temperature of 1000 ° C.
The diffusion bonding is performed by applying high pressure under the condition that the atmospheric pressure is 1200 atmospheres and the time is about 2 hours, so that artificial defects are inherent in the portion where the silica sol 5 is applied. The welded seal portion is, for example, 0.2 mm to 0.5 mm.
Finish the surface with a mm grinder or the like so that the appearance of divided marks is not noticeable.

[0016]

As described above, according to the present invention, a ceramic powder kneaded with water or an organic solvent is applied to the joint surface of each member constituting the standard metal test piece, and the periphery of the joint surface is coated. After sealing by electron beam welding,
Diffusion bonding by hot isostatic pressing or hot pressing, so that artificial defects are inherent in the portion where the ceramic powder is applied, the reduction in thickness due to pressing pressure is small, and therefore the thickness is very thin An excellent effect is achieved such that artificial defects of a desired size and shape can be included.

[Brief description of the drawings]

FIG. 1 is a perspective view of a standard specimen according to an embodiment of the present invention.

FIG. 2 is a perspective view of one member constituting a standard specimen according to the embodiment of the present invention.

FIG. 3 is a side view in which a part of a conventional test body is cut away.

FIG. 4 is a perspective view of another conventional test body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Standard specimen 2 Member of standard specimen 3 Member of standard specimen 4, 4a Joining surface 5 Powder 6 Seal part

Continued on the front page (72) Inventor Yukiya Nakagawa 3-1-1-15 Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Co., Ltd. (72) Inventor Moritaka Kishigami 14-1, Bentencho, Tsurumi-ku, Yokohama, Kanagawa Prefecture Within the Tsurumi Testing and Research Center, the Association for Testing of Power Generation Equipment (72) Inventor Atsunori Yamaguchi 14-1, Bentencho, Tsurumi-ku, Tsurumi-ku, Yokohama, Kanagawa Prefecture Within the Tsurumi Testing and Research Center (72) Inventor Hirofumi Shima 14-1, Benten-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Tsurumi Test Research Center, Japan Power Generation Equipment Inspection Association (56) References JP-A-58-55752 (JP, A) JP-A-61-246662 ( JP, A) JP-A-60-89728 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 1/00 102 G01N 27/82 G01N 29/22 507 JICST file (JOIS)

Claims (2)

(57) [Claims] A non-destructive inspection standard specimen including a standard defect to be compared when estimating a defect size in the non-destructive inspection, wherein a standard surface of a metal standard specimen has a joint surface. Apply ceramic powder kneaded with water or an organic solvent to a size corresponding to the size of the intrinsic defect on one of them, and seal the periphery of the joint surface by electron beam welding. A non-destructive inspection standard specimen, wherein the specimen is diffusion-bonded by a hot isostatic press or a hot press so that an artificial defect is present in a portion where the ceramic powder is applied. 2. A method for manufacturing a standard specimen for non-destructive inspection in which a standard defect to be compared in estimating a defect size by non-destructive inspection is provided. A step of applying ceramic powder kneaded with water or an organic solvent to a size corresponding to the size of the intrinsic defect on one of the joining surfaces, and a process of sealing the periphery of the joining surface by electron beam welding, Diffusion bonding the sealed standard specimen by hot isostatic pressing or hot pressing. A method for producing a standard specimen for nondestructive inspection.