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A process method of composite butt welding of q500qenh weathering steel in alpine region

A process method and technology in alpine regions, applied in the direction of manufacturing tools, welding equipment, welding accessories, etc., can solve the problems of poor welding performance and difficult to meet, and achieve the effects of remarkable weather resistance, easy operation, and excellent low temperature toughness.

Active Publication Date: 2022-04-19
CHINA RAILWAY JIUJIANG BRIDGE ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the technical problem that needs to be solved at present is that, with the increase of alloy content, the carbon equivalent of Q500qENH weather-resistant bridge steel increases accordingly, and the welding performance deteriorates; at the same time, the welding in the plateau cold environment has stricter requirements on the pre-weld preheating process and post-weld heat treatment process ; Conventional welding process methods and measures are difficult to meet the above standards

Method used

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  • A process method of composite butt welding of q500qenh weathering steel in alpine region
  • A process method of composite butt welding of q500qenh weathering steel in alpine region
  • A process method of composite butt welding of q500qenh weathering steel in alpine region

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Embodiment 1

[0056] A process method for composite butt welding of Q500qENH weathering steel in alpine regions, said process method comprising:

[0057] (1) Welding surface pretreatment

[0058] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0059] (2) Welding surface cutting treatment

[0060] (2) When the thickness of the plate is ≤20mm, the groove adopts a "Y" type symmetrical groove, the groove angle is 50°, and the height of the blunt edge is 2mm;

[0061] (3) Grinding again to remove metal debris, and then butt the blunt edges on both sides in the lower half of the "Y" shape;

[0062] (3) Composite butt welding forming process

[0063] (4) Welding primer: the welding wire with the tensile strength of the deposited metal ≥ 650MPa is used for the primer, and the primer is performed by gas shielded welding;

[0064] (5) Welding filling: Welding filling is carried out in the remaining area, and the welding wire with the tensile streng...

Embodiment 2

[0074] A process method for composite butt welding of Q500qENH weathering steel in alpine regions, said process method comprising:

[0075] (1) Welding surface pretreatment

[0076] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0077] (2) Welding surface cutting treatment

[0078] (2) When the plate thickness is less than or equal to 20mm, the groove adopts a "Y" type symmetrical groove, the groove angle is 60°, and the height of the blunt edge is 2mm;

[0079] (3) Grinding again to remove metal debris, and then butt the blunt edges on both sides in the lower half of the "Y" shape;

[0080] (3) Composite butt welding forming process

[0081] (4) Welding primer: the welding wire with the tensile strength of the deposited metal ≥ 650MPa is used for the primer, and the primer is performed by gas shielded welding;

[0082] (5) Welding filling: Welding filling is carried out in the remaining area, and the welding wire with the ...

Embodiment 3

[0092] A process method for composite butt welding of Q500qENH weathering steel in alpine regions, said process method comprising:

[0093] (1) Welding surface pretreatment

[0094] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0095] (2) Welding surface cutting treatment

[0096] (2) When the plate thickness is less than or equal to 20mm, the groove adopts a "Y" type symmetrical groove, the groove angle is 60°, and the height of the blunt edge is 2mm;

[0097] (3) Grinding again to remove metal debris, and then butt the blunt edges on both sides in the lower half of the "Y" shape;

[0098] (3) Composite butt welding forming process

[0099] (4) Welding primer: the welding wire with the tensile strength of the deposited metal ≥ 650MPa is used for the primer, and the primer is performed by gas shielded welding;

[0100] (5) Welding filling: Welding filling is carried out in the remaining area, and the welding wire with the ...

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Abstract

The invention discloses a process method for composite butt welding of Q500qENH weather-resistant steel in an alpine region. The process method can overcome the adverse influence of the alpine environment on the plateau on the welding performance, and improve the low-temperature toughness, crack resistance and weather resistance of the welded joint, thereby obtaining The welded joints with good mechanical properties and weather resistance have realized the matching welding of large-span, heavy-duty, high-strength, high-toughness and high-weather resistance bridge steel in plateau and alpine regions. At the same time, there is no need for pre-weld preheating and post-weld heat treatment, which improves production Efficiency, reduced energy consumption, especially suitable for welding high-strength bridge engineering thick plate structure steel.

Description

technical field [0001] The invention relates to a process method for manufacturing and welding heavy-duty bridges, in particular to a process method for composite butt welding of Q500qENH weathering steel in alpine regions. Background technique [0002] According to research, weathering steel bridges are widely used in the United States and Japan. In 1993, there were more than 23,000 weathering steel bridges in the United States. In 2000, 7% of steel bridges in Japan and 45% in the United States had adopted coating-free weathering steel. The development of my country's weather-resistant steel bridges is in its infancy, and related technologies generally refer to American standards. [0003] The middle section of Sichuan-Tibet Railway, a national key project (Ya'an-Linzhi), is designed as a national double-track Class 1, with a speed of 120-200km / h for EMUs and a length of 1,011km for the main line, spanning the Dadu River, Yalong River, Jinsha River, Lancang River, and Nujia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/32
CPCB23K9/16B23K9/18B23K9/32
Inventor 陈潜郭红艳潘云龙付建辉王磊王中美王员根李方敏朱东明向华徐慰玉高波黄勇黄旭光王明刘翔肖辉东
Owner CHINA RAILWAY JIUJIANG BRIDGE ENG