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Welding process method for Q500qENH weather-resistant steel corner joint in alpine region

A fillet joint and welding process technology, applied in welding equipment, welding accessories, manufacturing tools, etc., can solve the problems of poor welding performance and difficulty in conformity

Active Publication Date: 2021-04-09
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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  • Welding process method for Q500qENH weather-resistant steel corner joint in alpine region
  • Welding process method for Q500qENH weather-resistant steel corner joint in alpine region
  • Welding process method for Q500qENH weather-resistant steel corner joint in alpine region

Examples

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Effect test

Embodiment 1

[0058] A process method for welding Q500qENH weathering steel fillet joints in alpine regions, said process method comprising:

[0059] (1) Welding surface pretreatment

[0060] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0061] (2) Welding surface cutting treatment

[0062] (2) The weld seam adopts double-sided asymmetric groove, the length of the blunt side is 2mm, the center of the blunt side is located near the center of the welded plate, and the distance from the center of the blunt side to the edge of the far-end welded plate accounts for 10% of the overall thickness of the plate The ratio is 0.55; the groove angle is 45°;

[0063] (3) Grinding again to remove metal debris, and then butt the blunt edge of the welded plate with the substrate;

[0064] (3) Fillet joint welding forming process

[0065] (4) Welding: Use welding wire with a tensile strength of deposited metal ≥ 650MPa to weld the groove;

[0066] (5) T...

Embodiment 2

[0075] A process method for welding Q500qENH weathering steel fillet joints in alpine regions, said process method comprising:

[0076] (1) Welding surface pretreatment

[0077] (1) Grinding the welding surface and adjacent areas to remove surface rust and other sundries;

[0078] (2) Welding surface cutting treatment

[0079] (2) The weld seam adopts double-sided asymmetric groove, the length of the blunt side is 2mm, the center of the blunt side is located near the center of the welded plate, and the distance from the center of the blunt side to the edge of the far-end welded plate accounts for 10% of the overall thickness of the plate The ratio is 0.618; the groove angle is 50°;

[0080] (3) Grinding again to remove metal debris, and then butt the blunt edge of the welded plate with the substrate;

[0081] (3) Fillet joint welding forming process

[0082] (4) Welding: Use welding wire with a tensile strength of deposited metal ≥ 650MPa to weld the groove;

[0083] (5) ...

Embodiment 3

[0092] A process method for welding Q500qENH weathering steel fillet joints 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) The weld seam adopts double-sided asymmetric groove, the length of the blunt side is 2mm, the center of the blunt side is located near the center of the welded plate, and the distance from the center of the blunt side to the edge of the far-end welded plate accounts for 10% of the overall thickness of the plate The ratio is 0.65; the groove angle is 50°;

[0097] (3) Grinding again to remove metal debris, and then butt the blunt edge of the welded plate with the substrate;

[0098] (3) Fillet joint welding forming process

[0099] (4) Welding: Use welding wire with a tensile strength of deposited metal ≥ 650MPa to weld the groove;

[0100] (5) The...

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Abstract

The invention discloses a welding process method for a Q500qENH weather-resistant steel corner joint in an alpine region. The process method can overcome the adverse effect of the alpine environment of a plateau on the welding performance, the low-temperature toughness, the anti-cracking performance and the weather resistance of the welding joint are improved, and therefore the welding joint with the good mechanical performance and the good weather resistance is obtained, large-span, heavy-load, high-strength, high-toughness and high-weather-resistance bridge steel is welded in the alpine region of the plateau in a matched mode, meanwhile, pre-welding preheating and post-welding heat treatment are not needed, the production efficiency is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a manufacturing and welding process for heavy-duty bridges, in particular to a welding process for Q500qENH weather-resistant steel fillet joints 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 Nujiang River I...

Claims

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Application Information

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IPC IPC(8): B23K9/235B23K9/16B23K9/18B23K9/32
CPCB23K9/235B23K9/16B23K9/18B23K9/32
Inventor 李方敏郭红艳陈潜徐慰玉黄勇朱东明王员根高波付建辉潘云龙黄旭光王磊李正兵刘翔肖辉东王中美
Owner CHINA RAILWAY JIUJIANG BRIDGE ENG
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