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A welding method for flat butt joints of q370qd and q500qe bridge steel

A welding method and technology of butt joints are applied in welding equipment, welding medium, welding equipment, etc. to achieve the effects of good appearance of the weld, excellent low temperature impact toughness, and good fusion of the weld.

Active Publication Date: 2021-06-22
CHINA RAILWAY BAOJI BRIDGE GRP +1
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Problems solved by technology

At present, there is no experience in welding similar dissimilar materials for reference.

Method used

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  • A welding method for flat butt joints of q370qd and q500qe bridge steel
  • A welding method for flat butt joints of q370qd and q500qe bridge steel
  • A welding method for flat butt joints of q370qd and q500qe bridge steel

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Embodiment Construction

[0033] Attached below Figure 1-6 The present invention will be further described in detail with specific embodiments.

[0034] A welding method for flat butt joints of Q370qD and Q500qE bridge steel, the joint form is: the plate thickness of Q370qD and Q500qE bridge steel at the joint is both 21-41mm, the joint groove form is V-shaped groove, and the groove angle is 35 °~38°, the root gap is 6mm-30mm, and the groove angle decreases with the increase of the root gap;

[0035] The present invention adopts the solid welding wire argon-rich gas shielded welding as the base, and the flux-cored welding wire CO 2 For the composite welding method of gas shielded welding filling and covering, select solid welding wire and flux-cored welding wire with mechanical properties equivalent to those of Q500qE bridge steel and match the chemical composition, and continuously weld Q370qD and Q500qE butt joints through multiple layers and multiple passes. The specific welding Proceed as follow...

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Abstract

A welding method for flat butt joints of Q370qD and Q500qE bridge steel, the joint form is a V-shaped groove; the matching welding wire is solid welding wire and flux-cored welding wire; 2 Composite welding method of gas shielded welding filling cover. The invention selects solid welding wire and flux-cored welding wire whose mechanical properties are equivalent to those of Q500qE bridge steel, and whose chemical composition matches, and combines multi-layer and multi-pass continuous welding of Q370qD and Q500qE butt joints, not only the mechanical properties of the weld meet the standards and design Requirements, at the same time, the strength of the weld and the heat-affected zone are higher than the strength of the Q370qE base metal, the tensile fracture position of the weld joint is the side of the low material Q370qD base metal, and it is not broken at the stress concentration point of the butt joint and the weak position of the weld, which is used for Bridge engineering Q370qD and Q500qE heterogeneous butt joints have better safety.

Description

technical field [0001] The invention relates to a welding method for butt joints of dissimilar bridge steels, which belongs to the field of steel bridge manufacturing, and specifically relates to a welding method for flat butt joints of Q370qD and Q500qE bridge steels. Background technique [0002] With the continuous expansion of the construction scale of railway and highway bridges and the continuous improvement of the technical level, the function, structure and construction technology of bridges are adapting to high-speed, heavy-load, large-span, good integrity, high safety, and fully welded node steel structures. direction development. High-strength bridge steels such as 420Mpa and 500Mpa have been used in some domestic steel truss girders with high stress, and bridge steel is developing towards high strength and high performance. [0003] Wuhan Jianghan Seventh Bridge is a heavy-duty highway bridge with a total length of 672m and two-way six lanes. The lower chord of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/235B23K33/00B23K35/38B23K9/02B23K103/04
CPCB23K9/02B23K9/16B23K9/235B23K33/004B23K35/383B23K2103/04
Inventor 杜伟吴江波刘志刚李彦国田立莉
Owner CHINA RAILWAY BAOJI BRIDGE GRP
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