Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure

A technology of brittle crack propagation and welding method, which is applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem that brittle cracks do not transfer to the base material, and achieve the effect of preventing the propagation of brittle cracks

Inactive Publication Date: 2006-11-22
NIPPON STEEL CORP
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Problems solved by technology

[0011] However, when the thickness of the plate increases, even if ribs are installed, brittle cracks may propagate along the HAZ zone or the weld metal part without transferring to the base metal regardless of the rib 3

Method used

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  • Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure
  • Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure
  • Weld structure having excellent brittle crack propagation resistance and method of welding the weld structure

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Embodiment Construction

[0033] The best mode for carrying out the present invention will be described in detail with reference to FIGS. 2 to 4 .

[0034] Fig. 2 is a view showing a butt welded joint of a steel plate to which the welding method of the present invention is applied. In Figure 2, 2 represents the butt welding joint, 5 represents the butt welding area, and 6 represents the repair welding area.

[0035] The repair welding zone of the present invention is characterized in that, in the butt welded joint 2 (the heat-affected zone of the butt weld zone 5 and the steel plate 1) that has the possibility of brittle crack propagation as shown in FIG. In the region, a part of the butt welding joint 2 (the heat-affected zone of the welding region 5 and the steel plate 1) in the region is removed by gouging or machining, and then the part is repaired by welding with a welding material with excellent toughness, thereby The repair welding forms a repair welding zone 6 having a toughness higher than th...

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Abstract

This present invention relates to a welding method for manufacturing welded structures having excellent properties to prevent the propagation of brittle fracture occurring in welded joints, characterized by the step of forming a repair weld having a greater toughness than that of a butt weld and an outer edge whose angle with respect to the longitudinal direction of the butt weld is not less than 10 degrees and not more than 60 degrees, by applying repair welding to a region to arrest a brittle crack in a butt-welded joint where a brittle crack is likely to propagate after removing part of the butt-welded joint, in said region, by gouging or machining.

Description

technical field [0001] The present invention relates to a welded structure excellent in brittle crack propagation resistance and a welding method thereof, which prevents the propagation of brittle cracks generated in a welded joint. [0002] Specifically, it relates to a welding method of a welded structure excellent in brittle crack propagation resistance which prevents the propagation of brittle cracks that may occur on a welded joint of a welded structure using a thick plate and using a large heat input Welding is a technology that can improve the safety of building structures and civil steel structures. Background technique [0003] Welding is necessary for building steel structures, and high-energy-input welding is widely used for the purpose of reducing construction costs or improving construction efficiency. In particular, when the thickness of the steel plate increases, the number of welding man-hours increases dramatically, so it is strongly desired to perform weld...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04
Inventor 石川忠井上健裕岛贯广志小关正
Owner NIPPON STEEL CORP
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