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A Welding Process of Q500QENH Weathering Steel Corner Joints in Alpine Regions

A fillet joint, technology in alpine regions, applied in welding equipment, welding accessories, manufacturing tools, etc., can solve problems such as difficulty in conformity and poor welding performance, and achieve the effects of easy operation, remarkable weather resistance, and convenient application.

Active Publication Date: 2022-05-17
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 Welding Process of Q500QENH Weathering Steel Corner Joints in Alpine Regions
  • A Welding Process of Q500QENH Weathering Steel Corner Joints in Alpine Regions
  • A Welding Process of Q500QENH Weathering Steel Corner Joints in Alpine Regions

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Experimental program
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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 Q500qENH weather-resistant steel fillet joint joints in alpine regions. The process method can overcome the adverse effects of the alpine environment on the plateau on welding performance, and improve the low-temperature toughness, crack resistance and weather resistance of welded joints, 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, reducing energy consumption.

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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Patent Type & Authority Patents(China)
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