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Method for welding Q500qE ultralow-carbon bainite steel for bridge

A carbon bainitic steel, welding method technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problem of no technical solution, achieve promotion of upgrading, strong practicability, full objectivity and rationality Effect

Active Publication Date: 2013-09-11
CHINA RAILWAY SHANQIAO GRP CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the existing bridge steel welding methods at home and abroad do not have a targeted technical solution that can be completely displaced to solve the above problems, and new research and exploration are needed

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  • Method for welding Q500qE ultralow-carbon bainite steel for bridge
  • Method for welding Q500qE ultralow-carbon bainite steel for bridge
  • Method for welding Q500qE ultralow-carbon bainite steel for bridge

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Embodiment Construction

[0074] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0075] The chemical composition of the Q500qE ultra-low carbon bainitic steel for bridges involved in the present invention is listed in Table 1, and the mechanical properties are listed in Table 2.

[0076] Table 1: Chemical Composition of Steel (wt%)

[0077]

[0078] Table 2: Mechanical properties of steel

[0079]

[0080] According to the different plate thicknesses B of Q500qE ultra-low carbon bainitic steel for bridges, the present invention determines the preheating temperature before welding as follows: when the plate thickness B≤32mm, no preheating is required before welding; when the plate thickness B>32~44mm , the preheating temperature before welding is 80 °C; when the thickness of the plate B> 44 ~ 60mm, it needs to be preheated at 100 °C.

[0081] The invention aims at the welding heat input of Q500qE ultra-low ca...

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Abstract

The invention provides a method for welding Q500qE ultralow-carbon bainite steel for a bridge. The method is excellent in joint mechanical performance and high in welding efficiency and specifically includes that aiming at specific chemical components, applicable technical conditions and different plate thicknesses of the Q500qE ultralow-carbon bainite steel for the bridge, preheating temperature before welding, groove types and welding process parameters are determined; a welding joint type adopts butt joint, penetration angle joint or ship position T-shaped angle joint; a welding method adopts submerged arc welding, CO2 gas shielded semiautomatic welding or shielded metal arc welding. By the welding method, the joint type and thickness specifications of a bridge structure are comprehensively covered, the technical scheme is simple, convenient and high in adaptivity, all implementing effects meet technical requirements of standards related to building of bridge steel and the bridge structure, and the method is of great significance in promoting upgrading of the bridge steel and development of large-span steel bridge building technology. The method can be applied to building of the bridge structure, can also be applied to welding of other ultrathin-carbon bainite steel and is high in adaptivity.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material welding, and particularly provides a welding method of Q500qE ultra-low carbon bainitic steel for bridges. Background technique [0002] At present, the substantial improvement of my country's railway and highway transportation capacity requires the continuous expansion of the construction scale of railway and highway bridges and the continuous improvement of the technical level. Good integrity, high safety, and the use of all-welded joint steel structures. Therefore, the requirements for the strength, low temperature toughness, fatigue, corrosion and other service performance and welding performance of bridge steel are getting higher and higher, and the maximum thickness of bridge steel plate also exceeds 50mm. The strength level of existing bridge steel in my country has developed from Q235q, Q345q, Q370q to Q420q, and the strength level of foreign bridge steel has reached 690MPa...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/16B23K9/00B23K35/24C22C38/58C22C38/50C22C38/16
Inventor 徐向军高建忠杨永强单亚廷孙泽宋红飞陈英杰刘洪柱顾晓勇郝海静
Owner CHINA RAILWAY SHANQIAO GRP CO LTD
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