Welding method of high-performance weather-proof bridge steel for extremely cold area

A welding method and weather-resistant technology, applied in welding equipment, welding medium, welding equipment, etc., to achieve the effects of good joint mechanical properties, strong applicability, full objectivity and rationality

Active Publication Date: 2018-05-22
CHINA RAILWAY SHANQIAO GRP CO LTD +1
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  • Description
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Problems solved by technology

Q420qFNH steel was first proposed in GB / T 714-2015 "Structural Steel for Bridges". There is no relevant domestic information on welding material selection and welding process selection for reference. Welding of Q420qFNH high-performance weather-resistant bridge steel for regional use is not involved

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  • Welding method of high-performance weather-proof bridge steel for extremely cold area
  • Welding method of high-performance weather-proof bridge steel for extremely cold area
  • Welding method of high-performance weather-proof bridge steel for extremely cold area

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Embodiment Construction

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0036] The chemical composition of Q420qFNH high-performance weather-resistant bridge steel for extremely cold regions involved in the present invention is listed in Table 1, and the mechanical properties are listed in Table 2.

[0037]

[0038] Table 1 Chemical composition of steel plate

[0039]

[0040] Table 2 Mechanical properties of steel plates

[0041] Preheating temperature before welding: when the plate thickness B≤20mm, no preheating before welding is required; when the plate thickness B is 20~40mm, prehe...

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Abstract

The invention discloses a welding method for bridge steel. The welding method is aimed at specific chemical components, the applicable technical condition and different plate thicknesses of the Q420qFNH high-performance weather-proof bridge steel for the extremely cold area. The welding process problem of the weather-proof steel is solved. Abut-joint or T-type angular joint is adopted in the welding joint manner, according to the welding method, submerged-arc welding and solid welding wire rich-argon gas protection welding are adopted, according to the different plate thicknesses, the before-welding preheating temperature is determined, according to different welding methods and different welding positions, welding process parameters are determined. The joint manner and the thickness specification of a bridge structure are comprehensively considered, the technical scheme is simple, convenient, and high in adaptation, the implementing effect meets the technical requirement of existing bridge steel and bridge structure building related standard, and the method can be actually applied to welding of a Q420qFNH weather-proof steel bridge.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, in particular to a welding method for high-performance weather-resistant bridge steel used in extremely cold regions. Background technique [0002] According to the "cold degree scale" formulated by the meteorological profession, the weather below -40°C is "extremely cold". The lowest temperatures in northeastern my country, northeastern Inner Mongolia, and northern Xinjiang are all below -50°C, and there will be extremely cold weather. In order to adapt to this harsh climate environment, Q420qFNH high-performance weather-resistant bridge steel was specially researched and developed. The extremely cold weather puts forward higher requirements for steel products, requiring -60°C low temperature impact energy KV2≥47J, while ensuring atmospheric corrosion resistance index I≥6.0 and good weldability. In order to improve the weather resistance and low-temperature impact tou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K35/30
CPCB23K9/16B23K35/3073
Inventor 徐向军高建忠胡广瑞田智杰贝玉成顾晓勇范军旗刘振刚陈英杰于洋常国光朱庆菊李国辉
Owner CHINA RAILWAY SHANQIAO GRP CO LTD
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