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Inspection method of welded joints

A technology of welding joints and inspection methods, which is applied to the supporting elements of the blade, engine functions, instruments, etc., can solve the problem that the penetration part cannot be seen visually, and achieve the effect of maintaining airtightness

Active Publication Date: 2018-08-17
MITSUBISHI POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the penetration part M cannot be seen from the outer space O

Method used

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  • Inspection method of welded joints
  • Inspection method of welded joints
  • Inspection method of welded joints

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Experimental program
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Embodiment approach 1

[0035] based on Figure 1 ~ Figure 4 , the first embodiment of the present invention will be described. figure 1 The state after the divided hollow disks 10 and 20 constituting the steam turbine rotor are welded by the welded joint part W is shown. The steam turbine rotor is constructed by axially welding a plurality of divided hollow disks including the divided hollow disks 10 and 20 . An inner space I is formed inside the welded joint part W. As shown in FIG. figure 2 and image 3 The joint surface Wc before welding is shown.

[0036] exist figure 2 and image 3 In the joint surface Wc, the beveled portions 12 and 22 are formed on the side of the outer space O, and the mating surfaces 14 and 24 are formed on the side of the inner space I. The mating surfaces 14 and 24 abut against each other.

[0037] Such as image 3As shown, an annular groove 32 opening to the inner space I is formed along the circumferential direction of the divided hollow discs 10 and 20 at on...

Embodiment approach 2

[0045] Next, based on Figure 5 A second embodiment of the present invention will be described. In this embodiment, as in the first embodiment, an inward space I is formed along the circumferential direction of the divided hollow discs 10 and 20 at one end of the mating surfaces 14 and 24 on the opposite side to the groove portions 12 and 22 . An open annular groove 44 . The groove 44 is formed by arranging the quadrilateral notch 46 formed only on the mating surface 24 of the divided hollow disc 20 to face the divided hollow disc 10 . Other structures are the same as those of the first embodiment. According to the present embodiment, the groove 44 can be formed only by machining the mating surface 24 , so the machining of the groove 44 is easy.

Embodiment approach 3

[0047] Next, based on Image 6 and Figure 7 , the third embodiment of the present invention will be described. exist Image 6 In (A), in this embodiment, similar to the second embodiment, the groove 44 opening to the inner space I makes only the quadrangular cutout 46 formed on the mating surface 24 of the divided hollow disc 20 and the divided hollow disc 10. Formed relative to configuration. In addition, besides the groove 44, a protrusion 48 is formed on the butt surface of the divided hollow disk 20 adjacent to the groove 44 and on the inner side (outside space O side) of the groove 44, and on the side of the divided hollow disk 10, a protrusion 48 is formed. A convex portion 50 is formed on the mating surface. The convex portion 48 and the convex portion 50 have shapes that are complementary to each other.

[0048] Image 6 (B) shows the surfacing welding P of the first weld pass 1 , Surfacing welding P of the second pass 2 And the surfacing welding P of the thir...

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Abstract

The purpose of the present invention is to inspect the surface of the welded joint at a position that cannot be seen visually without drilling an inspection hole on the base metal, and includes the following steps: a groove forming step, formed on the two base metals (10, 20 ) on the joint surface (Wc) between the groove portion (12 and 22) and the butt joint surface (14 and 24), and at one end of the butt joint surface, a groove opening to the surface of the base metal (10 and 20) is preformed ( 32); the radiation irradiation step, after at least one bead welding (P1) has been carried out for the groove (12 and 22), from the radiation irradiation device ( 34) irradiating the radiation toward the joint surface (Wc); and a judging step, forming an image on the photosensitive film (42) by the radiation passing through the joint surface (Wc), and judging whether the welding joint (W) is unfinished or not based on the image. The presence or absence of penetration.

Description

technical field [0001] The present invention relates to a method for non-destructively inspecting a welded joint for the presence or absence of incomplete penetration using radiation. Background technique [0002] In the rotor of a steam turbine, as the temperature of steam increases, parts such as the high-temperature part exposed to high-temperature steam and the low-temperature part exposed to low-temperature steam are made of materials suitable for the environments in which they are placed separately, and are joined together by welding. . For example, the high temperature part is made of high heat-resistant steel, and the low temperature part is made of low alloy steel. Figure 8 A general structure of a steam turbine is shown. exist Figure 8 In the steam turbine 1, a plurality of split hollow disks 7 are fitted between cylindrical split hollow disks 5 having a support shaft 3 at both ends, and the abutting portions of the adjacent split hollow disks 5 and 7 are welded...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/04
CPCF01D5/063F01D21/003F05D2230/232F05D2260/80F05D2300/171G01N23/04G01N2223/629
Inventor 西本慎田中亮川崎宪治远藤裕之内山健太郎郡佳伸
Owner MITSUBISHI POWER LTD
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