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Welded structure with excellent brittle crack propagation stop characteristics

A technology of brittle crack propagation and structural body, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of large safety guarantee

Active Publication Date: 2021-03-09
JFE STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the hull structure to which thick-walled high-strength steel plates with a plate thickness of 50 mm or more are applied, ensuring safety becomes a major issue.

Method used

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  • Welded structure with excellent brittle crack propagation stop characteristics
  • Welded structure with excellent brittle crack propagation stop characteristics
  • Welded structure with excellent brittle crack propagation stop characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0133] Hereinafter, the present invention will be described in detail based on examples.

[0134] The thick steel plate with the plate thickness shown in Table 1-1 and Table 1-2 is used as the web and the flange, and the double member shown in Table 1-1 and Table 1-2 is provided at the butt joint between the web and the flange , produced Figure 4 (a), (b), (c) and Figure 5 (a), (b), (c) shown in the shape of the actual structural size of the large welded structural joints 9 . Figure 4 (a), (b), (c) assume the case of brittle crack initiation / propagation from the flange, Figure 5 (a), (b), (c) assume the case of brittle crack initiation / propagation from the web.

[0135] It should be noted that, in the fillet joint of the manufactured large-scale welded structural joint 9, the unwelded width B F , Double the plate width D of member 10 W , The leg length of the left and right fillet welds l F Change and change the ratio Y of the unwelded part to make figure 1 The unwe...

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Abstract

It is a welded structure provided with a doubling member (10) at the butt joint between the web (1) and the flange (2). Butt the end surface of the web plate with the surface of the double member, join the web plate with the double member through fillet welding, make the flange surface overlap with the surface of the double member, and join with the double member through fillet welding. At this time, the ratio Y (%) of the width of the unwelded portion of the overlapping surface in the joint section of the fillet joint to the sum of the plate width of the double member and the leg length of the left and right fillet welds, and the operating temperature Brittle crack propagation arrest toughness (Kca) of doubled components at T (°C) T (N / mm 3 / 2 ) is adjusted in such a way that Y(%)≥{6900‑Kca} / 85 is satisfied. As a result, the propagation of brittle cracks originating from the flange can be prevented or stopped by the doubling member.

Description

technical field [0001] The present invention relates to welded steel structures formed by welding construction using thick steel plates, such as large container ships and bulk carriers, and particularly relates to a structure capable of suppressing the propagation of brittle cracks generated from thick steel plate base materials or welded joints. It is a welded structure that stops before the large-scale destruction of objects and has excellent brittle crack propagation stop characteristics. Background technique [0002] A container ship or a bulk carrier has a structure in which there are few partition walls in the hold and a large opening in the upper part of the ship, unlike an oil tanker, for example, in order to improve loading capacity or loading and unloading efficiency. Therefore, in a container ship or a bulk carrier, it is necessary to increase the strength or thicken the hull plating especially. [0003] In addition, container ships have increased in size in rece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00B63B73/43
CPCB23K9/00B23K9/02B23K31/00B63B73/43
Inventor 半田恒久伊木聪大井健次丰田昌信木治升
Owner JFE STEEL CORP
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