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Q500qE high-strength bridge steel corner joint welding method

A welding method and high-strength technology, which is applied in the field of steel bridge manufacturing, can solve the problems of high-strength steel cold straightening, small deformation of plate units after welding, and affecting service fatigue life. The effect of high welding efficiency

Active Publication Date: 2018-11-16
CHINA RAILWAY BAOJI BRIDGE GRP +2
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Problems solved by technology

[0003] The purpose of the present invention is to propose a welding method for Q500qE high-strength bridge steel corner joints, which does not require preheating before welding and heat preservation after welding, and after welding, the deformation of the plate unit is small, and the verticality of the stiffener is high without correction, which solves the problem of high strength. Difficulty in cold straightening of steel, hot straightening affects fatigue life

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  • Q500qE high-strength bridge steel corner joint welding method

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Embodiment Construction

[0019] Attached below figure 1 , 2 , 3 and specific embodiments The present invention will be described in further detail.

[0020] 1) Welding base metal: the thickness of the bottom plate is 40-58mm, and the thickness of the ribs (stiffeners) is 36-44mm; the bottom plate and the ribs are both Q500qE high-strength bridge steel, and their longitudinal and transverse tensile strengths are 659-730MPa , the longitudinal and transverse yield strengths are 528-573MPa, the elongation is 20.5%-26%, the low-temperature impact (-40°C) is 232-300J, and the shear section rate (-40°C) is 90%-100%;

[0021] 2) Welding groove: Partial penetration double-sided symmetrical grooves are opened on both sides of the ribs, and the groove angle is 48°. The double-sided groove angle of the existing partial penetration weld is 45° or 50°. When the 45° groove is used for welding, penetration is easy to occur, that is, incomplete fusion occurs at the weld root. 50° groove is used, because the plate i...

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Abstract

Provided is a Q500qE high-strength bridge steel corner joint welding method. Two sides of a rib plate are provided with partially penetrated two-sided symmetrical grooves, groove angles are 48 degrees, and then the rib plate is vertically assembled and positioned on a base plate; during welding, an ER60Q solid wire and a CO2 gas shielded welding technology are firstly adopted to weld passes transversely, synchronously and symmetrically, and the rib plate is vertically fixed to the base plate; then, an H60Q submerged arc welding wire, an SJ105q submerged arc welding agent and an automatic submerged arc welding process are adopted to perform sequential filling of two sides of a ship's position and cover surface welding, and the angle of the ship's position is 45 degrees. According to the welding method integrating transverse gas shielded welding and ship's position submerged arc welding, preheating is not needed before welding, deformation correction is not needed after welding, formed welded appearance is attractive, and weld joints are internally reliable in performance, stable in quality, small in welding deformation and high in production efficiency. The Q500qE high-strength bridge steel corner joint welding method is suitable for welding of high-strength large and thick bridge steel plate units.

Description

technical field [0001] The invention relates to a welding method for a Q500qE high-strength bridge steel corner joint, belonging to the field of steel bridge manufacturing. Background technique [0002] With the rapid development of transportation infrastructure, welded steel bridges have been widely used in bridge construction due to their unique advantages such as light weight, long life, energy saving and environmental protection, and show a trend of developing towards long-span and high-strength grades. The existing welding method of Q500qE high-strength bridge steel corner joints requires preheating before welding and heat preservation after welding, and the deformation of plate elements after welding is large, and the verticality of stiffeners needs to be corrected. Affect the fatigue life of use. Contents of the invention [0003] The purpose of the present invention is to propose a welding method for Q500qE high-strength bridge steel corner joints, which does not ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/235B23K35/22
CPCB23K9/16B23K9/18B23K9/235B23K35/22
Inventor 李彦国朱新华吴江波车平李明涛杨鸿涛
Owner CHINA RAILWAY BAOJI BRIDGE GRP
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