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A process method of single-sided welding and double-sided forming of q500qenh weathering steel in alpine regions

A single-sided welding double-sided, process method technology, applied in the direction of manufacturing tools, welding equipment, welding accessories, etc., can solve problems such as difficulty in conformity, poor welding performance, etc., to achieve the effects of easy operation, remarkable weather resistance, and convenient application.

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 single-sided welding and double-sided forming of q500qenh weathering steel in alpine regions
  • A process method of single-sided welding and double-sided forming of q500qenh weathering steel in alpine regions
  • A process method of single-sided welding and double-sided forming of q500qenh weathering steel in alpine regions

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Effect test

Embodiment 1

[0054] A process method for one-sided welding and double-sided forming of Q500qENH weathering steel in an alpine region, the process method comprising:

[0055] (1) Welding surface pretreatment

[0056] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0057] (2) Welding surface cutting treatment

[0058] (2) Cut the two welding surfaces into grooves, the grooves are single-sided "V" grooves, the groove angle α is 40°, the blunt edge height H is 2mm, and the blunt edge distance D is 6mm ;

[0059] (3) Grinding again to remove metal debris;

[0060] (3) Single-sided welding and double-sided forming process

[0061] (4) Welding primer: the welding wire with the tensile strength of the deposited metal ≥ 650MPa is used for the primer, and the gas shielded welding is used to cover the blunt edge;

[0062] (5) Welding filling: Welding filling is carried out in the remaining area, and the welding wire with the tensile strength of th...

Embodiment 2

[0072] A process method for one-sided welding and double-sided forming of Q500qENH weathering steel in an alpine region, the process method comprising:

[0073] (1) Welding surface pretreatment

[0074] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0075] (2) Welding surface cutting treatment

[0076] (2) Cut the two welding surfaces into grooves, the grooves are single-sided "V" grooves, the groove angle α is 45°, the height of the blunt edge is 2mm, and the distance D of the blunt edge is 5mm ;

[0077] (3) Grinding again to remove metal debris;

[0078] (3) Single-sided welding and double-sided forming process

[0079] (4) Welding primer: the welding wire with the tensile strength of the deposited metal ≥ 650MPa is used for the primer, and the gas shielded welding is used to cover the blunt edge;

[0080] (5) Welding filling: Welding filling is carried out in the remaining area, and the welding wire with the tensile st...

Embodiment 3

[0090] A process method for one-sided welding and double-sided forming of Q500qENH weathering steel in an alpine region, the process method comprising:

[0091] (1) Welding surface pretreatment

[0092] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0093] (2) Welding surface cutting treatment

[0094] (2) Cut the two welding surfaces into grooves, the grooves are single-sided "V" grooves, the groove angle α is 45°, the height of the blunt edge is 0, and the distance D of the blunt edge is 5mm ;

[0095] (3) Grinding again to remove metal debris;

[0096] (3) Single-sided welding and double-sided forming process

[0097] (4) Welding primer: the welding wire with the tensile strength of the deposited metal ≥ 650MPa is used for the primer, and the gas shielded welding is used to cover the blunt edge;

[0098] (5) Welding filling: Welding filling is carried out in the remaining area, and the welding wire with the tensile stre...

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Abstract

The invention discloses a process method for single-side welding and double-side forming of Q500qENH weather-resistant steel in an alpine region. The process method can overcome the adverse influence of the plateau's alpine environment on welding performance, and improve the low-temperature toughness, crack resistance and weather resistance of welded joints. , so as to obtain welded joints with good mechanical properties and weather resistance, and realize the matching of welded long-span, heavy-duty, high-strength, high-toughness and high-weather resistance bridge steel in the plateau and alpine regions, without the need for pre-weld preheating and post-weld heat treatment. Improve production efficiency and reduce energy consumption.

Description

technical field [0001] The invention relates to a process method for manufacturing and welding a heavy-duty bridge, in particular to a process method for single-side welding and double-side forming of Q500qENH weathering steel in an alpine region. 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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/235B23K9/32
CPCB23K9/16B23K9/18B23K9/235B23K9/32
Inventor 郭红艳付建辉陈潜梁辉黄旭光李方敏朱东明王员根李正兵潘云龙徐慰玉高波王磊黄勇刘翔肖辉东王中美
Owner CHINA RAILWAY JIUJIANG BRIDGE ENG
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