Brittle fracture crack transmission resisting T-shaped welding joint construction with excellent crack arrest characteristic

A technology for welding joints and structures, applied in the direction of welding/welding/cutting objects, connecting components, welding equipment, etc., can solve problems such as difficult temperature distribution control, achieve clear welding construction methods and quality management methods, simple composition, and prevent brittleness The effect of crack propagation

Active Publication Date: 2008-09-10
KOBE STEEL LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0014] Moreover, in this technology, a steel plate with a plate thickness of 50mm was used as a horizontal member to conduct a brittle fracture test. It was found that when the thickness of the steel plate becomes thicker, the temperature distribution control in the direction of the plate thickness becomes difficult. This technology is not an effective method for members whose plate thickness exceeds 50mm due to the enlargement of the ship

Method used

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  • Brittle fracture crack transmission resisting T-shaped welding joint construction with excellent crack arrest characteristic
  • Brittle fracture crack transmission resisting T-shaped welding joint construction with excellent crack arrest characteristic
  • Brittle fracture crack transmission resisting T-shaped welding joint construction with excellent crack arrest characteristic

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Embodiment

[0052]As the vertical member, a steel plate with an average pendulum absorbed energy of 70J or more at -20°C in the center of the plate thickness, which is welded by gas-electric welding is used, and steel plates with various characteristics are used as the horizontal member on top of it, and these are combined. Made T-welded joints (refer to the figure 2 ), the brittle failure test (ESSO test with a certain temperature) was carried out on the welded joint.

[0053] Figure 5 It is an explanatory diagram showing the above-mentioned test conditions. Among the figures, 20 shows a test body composed of a vertical member 5 and a horizontal member 6. On the bottom of the horizontal member 6, a steel plate for suppressing brittle fracture is fixed by welding (for example, carbon dioxide surfacing welding). Auxiliary steel material 16 for test body centrifugal. On the test body 20, the ribs 17a, 17b and the lead plates 18a, 18b are connected, and by applying the load in the opposi...

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Abstract

The invention provides a T shape welded joint structure which is formed by jointing a vertical component and a horizontal component, the vertical component is formed by butt welding with high strength steel plate and the horizontal component is formed by butt welding with high strength steel plate. The structure is charactered in that position of a welding line of the vertical component on the T shape welded joint structure extended direction is inconsistent with position of a welding line of the horizontal component on the T shape welded joint structure extended direction, and the high strength steel plate constituting the horizontal component satisfies (1) Kca value for representing fracture-arrest characteristic that is more than 7000N/mm<3/2> at -10 DEG C., (2) average pendulum absorbing energy value is more than 70J at -100 DEG C. in plate thickness direction 1/2. Brittle crack transmission can be prevented efficiently by using the structure, even if brittle failure generates on large heat quality importing welding part.

Description

technical field [0001] The present invention relates to a T-shaped welded joint structure that can well prevent the propagation of brittle cracks generated in welded portions with large heat input. The T-shaped welded joint structure of the present invention can be applied to the field of shipbuilding, marine structures, low-temperature oil tanks, pipelines, civil and architectural structures, etc., which adopt T-shaped welded joint structures. Nearby vertical members are described as representative examples. Background technique [0002] When brittle failure is considered in large container ships and bulk carriers, it generally refers to the development of fatigue cracks starting from welding defects during high-heat input welding on longitudinal members near the deck, and the formation of brittle failure at a certain stage. [0003] Therefore, it is necessary to stop the propagation of brittle cracks even if a brittle fracture occurs accidentally in a welded portion where...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B5/08
CPCB23K9/02B23K31/02B23K2101/18B23K2103/04
Inventor 古川直宏田村荣一
Owner KOBE STEEL LTD
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