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Welding methods and welded joints

一种焊接方法、焊接部的技术，应用在焊接/焊接/切割物品、焊接设备、焊接介质等方向

Inactive Publication Date: 2017-09-29
OSAKA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with this technology, the improvement in the fatigue life of the welded part is at most about 1.5 to 2 times that of the conventional one.

Method used

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  • Welding methods and welded joints
  • Welding methods and welded joints
  • Welding methods and welded joints

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Embodiment Construction

[0095] Hereinafter, the present invention will be described based on the embodiments. In addition, this invention is not limited to the following embodiment. Various modifications can be added to the following embodiments within the same and equivalent scope as the present invention.

[0096] First, an outline of a welded joint according to the present invention and an outline of a conventional welded joint will be described using the drawings. figure 1 Table shows the welded joint made by the welding method of the present invention, in addition, figure 2 The table in the table shows welded joints produced by conventional welding methods. figure 1 , 2 In each drawing, (a) is a plan view, and (b) is a side view.

[0097] figure 2 In the conventional welded joint shown in , conventional fillet welding is used to weld a flat plate 10 as a base material to a gusset plate 20 to form a welded portion 31 and a fillet welded portion 32 on the lower side of the gusset plate 20...

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Abstract

The present invention provides a welding method and a welded joint capable of greatly improving the fatigue strength of a corner-wrapped welded portion between a gusset plate and high-strength steel. The welding method of the present invention is a welding method for welding the gusset plate to high-strength steel through fillet welding, using a welding material whose martensitic transformation starting point of the weld metal is 350° C. Form a weld bead with a length of 17 mm or more in the side direction. The invention also provides a welded joint for welding a gusset plate to high strength steel using the welding method. The present invention also provides a welding method for repairing or strengthening a fillet welded portion composed of a gusset plate and a base metal in an existing steel structure by welding, using the martensitic phase of the weld metal For welding materials with a change starting point of 350°C or less, the weld bead is formed so that the length of the weld bead from the end of the gusset plate is 17 mm or more in the long side direction of the end of the gusset plate at the fillet weld .

Description

technical field [0001] The present invention relates to a welding method for fillet welding a gusset plate to high-strength steel in a welded structure using high-strength steel. Background technique [0002] In order to increase the size of welded structures such as ships, marine structures, and bridges, and to reduce the weight and safety associated with them, in recent years, high-strength steels whose tensile strength has been increased from 500 MPa to 1000 MPa have gradually begun to be used. [0003] The fatigue strength represented by the fatigue life and fatigue limit of the base material also increases in proportion to the high strength, but the fatigue strength of the welded part does not increase as long as the conventional welding technology is used. [0004] Among the welded parts, there are various types of welded parts such as butt welded parts, fillet welded parts and corner welded parts, but among them, the corner welded part when the gusset plate is welded ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/00B23K9/02B23K9/23B23K35/30
CPCB23K9/0043B23K9/0256B23K9/23B23K31/00B23K35/30B23K35/3053B23K2103/04B23K2101/18B23K31/02F16B5/08
Inventor 志贺千晃平冈和雄
Owner OSAKA UNIV
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