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Weld structure having resistance to brittle crack propagation

A structural and expansive technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of reduced strength of welded structures and long extension of brittle cracks, so as to prevent large-scale damage and high The effects of safety and high productivity

Inactive Publication Date: 2012-10-03
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, when the welded structure described in Patent Document 2 is applied to a large-scale building, for example, a brittle crack that propagates in a welded joint may propagate in a welded joint in which a crack arresting member is welded to a steel plate. And enter the crack arrester, after expanding inside the crack arrester as it is, it expands again in the welded joint
On the other hand, when the brittle cracks that propagated in the welded joint are diverted to the base metal side at the position of the crack arresting member and the welded joint of the crack arresting member welded to the steel plate, similarly to the above, when the base metal When the fracture toughness of the material is insufficient, the brittle cracks will grow longer, and there is also a concern that the strength of the welded structure will be significantly reduced.

Method used

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  • Weld structure having resistance to brittle crack propagation
  • Weld structure having resistance to brittle crack propagation
  • Weld structure having resistance to brittle crack propagation

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach ］

[0054]

[0055] The first embodiment is, if figure 2 As shown, an example of the case where the steel plate welded joint 2 is formed by butt welding the steel plates 1 and 1 will be described below by referring to the form applied to the joint as a welded structure A.

[0056] In the welded structure A, the anti-crack control part 4 is provided at least one place of the steel plate welded joint where crack generation and propagation are expected to occur when a large destructive energy due to collision, earthquake, etc. is applied.

[0057] The anti-crack control part 4 is provided in a manner to penetrate the steel plate 1, including: the brittle crack propagation stop characteristic Kca is 6000N / mm 1.5 A crack arresting member 5 made of the above steel materials, and a crack arresting welded joint 6 formed by butt welding the crack arresting member 5 to the steel plate 1 .

[0058] The crack arresting member 5 is formed such that the outer edge portions 50 (51, 52) respe...

no. 2 Embodiment approach ］

[0122] Hereinafter, for the welded structure B as the second embodiment of the present invention, mainly refer to Figure 4 to elaborate. In addition, in the following description, the same code|symbol is attached|subjected to the structure common to the welded structure A of 1st Embodiment mentioned above, and the detailed description is abbreviate|omitted.

[0123] The welded structure B is an example of a case where the steel plates to be butt-welded are formed by butt-welding a plurality of small steel plates.

[0124] That is, if Figure 4 As shown, the steel plate 10 is at least two or more small steel plates arranged in the longitudinal direction of the steel plate welded joint 20 (refer to Figure 4 Marks 21 to 24 in ) are formed by butt welding, and the crack resistance control part 4 is provided in the steel plate welded joint 20 formed by butt welding the steel plates 10 and 10 .

[0125] Between the small steel plates 21, 22, by butt welding, small steel plate w...

Embodiment

[0140] [Manufacture of welded structures]

[0141] First, in the steelmaking process, deoxidation, desulfurization and chemical composition of molten steel were controlled, and ingots having chemical compositions shown in Table 1 below were produced by continuous casting. Then, the ingot was reheated and hot-rolled under the manufacturing conditions in accordance with the standard manufacturing conditions of the Nippon Kaiji Kaisha (NK) standard rolled steel materials for ship hulls KA32, KA36, and KA40, thereby manufacturing steel pipes of various thicknesses. steel plate. Furthermore, various heat treatments were performed on the steel sheet, and the conditions at this time were controlled, thereby properly adjusting the brittle crack growth stop characteristic Kca (N / mm 1.5 ) for various values.

[0142] The ESSO test (brittle crack growth stop test) piece with a size of 500mm×500mm×plate thickness is appropriately prepared from the manufactured steel plate, and the Kca c...

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Abstract

Disclosed is a weld structure in which a steel plate weld joint is formed by butt-welding steel plates together, wherein: an anti-crack control section in which the propagation of brittle cracks generated in the steel plate weld joint are stopped is disposed on at least one section of the steel plate weld joint; and the outer peripheral section of an arrestor member configuring the anti-crack control section is formed on the front and rear of the steel plate weld joint in the lengthwise direction so as to intersect with the steel plate weld joint at an angle between 60 DEG to 120 DEG relative to the lengthwise direction. As a consequence, it is possible to prevent brittle cracks from propagating the weld joint or the base material even when brittle cracks form on the weld joint.

Description

technical field [0001] The present invention relates to a welded structure having resistance to the growth of brittle cracks, which controls and suppresses the growth of brittle cracks when brittle cracks occur in welded joints. [0002] In particular, it relates to a welded structure having resistance to brittle crack growth that can control and suppress the propagation of brittle cracks even when a brittle crack occurs in a welded joint of a welded structure using a thick steel plate and can improve safety. Background technique [0003] In recent years, welded structures represented by welded structures for ships such as large container ships and bulk carriers, architectural structures, and civil engineering steel structures have been required to have high safety against damage such as brittle cracks. In particular, the size of container ships has increased significantly. For example, large container ships of 6,000 TEU or more have been manufactured, and the steel plates o...

Claims

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Application Information

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IPC IPC(8): B23K31/00C22C38/00C22C38/04C22C38/58
CPCC22C38/14B23K2203/04B23K9/025C21D9/50B23K2201/18C22C38/12C22C38/04B23K9/173C22C38/002C22C38/06C22C38/02B23K31/02B23K33/004C22C38/08C22C38/16B23K2101/18B23K2103/04
Inventor 石川忠井上健裕桥场裕治大谷润
Owner NIPPON STEEL CORP
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