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Composite welding method for full penetration T-shaped joint of high-performance weather-resistant bridge steel

A full-penetration, high-performance technology, applied in the direction of welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of construction environment, manufacturing cost and manufacturing cycle difficulties, and cannot meet the supporting technical requirements, etc., to achieve high impact toughness reserve And the effect of safety margin, excellent crack resistance, excellent low temperature toughness

Inactive Publication Date: 2020-01-10
CHINA RAILWAY JIUJIANG BRIDGE ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the manufacturing process of large-scale steel structures, pre-weld preheating and post-weld heat treatment mean difficulties in the construction environment, manufacturing cost and manufacturing cycle, which cannot meet the supporting technical requirements of my country's new generation of high-strength, high-toughness, and high-weather resistance bridge steels.

Method used

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  • Composite welding method for full penetration T-shaped joint of high-performance weather-resistant bridge steel
  • Composite welding method for full penetration T-shaped joint of high-performance weather-resistant bridge steel

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1) The base steel type is Q690qENH, its yield strength ReL≥690MPa, tensile strength Rm≥810MPa, elongation A≥14%, -40℃ impact energy KV 2 ≥120J; unequal thickness bridge steel with plate thickness combination of 32mm+50mm;

[0040] The size of the test plate is 600mm×150mm×32(50)mm;

[0041] 2) The groove adopts K-type asymmetric groove, the groove angle is 50°, and the blunt edge is 2mm;

[0042] Welding material matching: XY-ER80QNH welding wire is used as the gas shielded welding wire for bottoming, the diameter of the welding wire is Ф1.2mm, and the argon-rich gas is protected, and the composition of the argon-rich gas is 80% Ar+20% CO 2 , the mechanical properties of the deposited metal are Rel is 746MPa, Rm is 833MPa, A is 17.5%, -40℃KV 2 The impact energy is 79J;

[0043] Submerged arc automatic welding uses XY-S80QNH welding wire with a diameter of Ф4.0mm and XY-AF85QNH flux combination. The mechanical properties of the deposited metal are Rel is 770MPa, Rm is 9...

Embodiment 2

[0049] 1) The base steel type is Q690qENH, its yield strength ReL≥690MPa, tensile strength Rm≥810MPa, elongation A≥14%, -40℃ impact energy KV 2 ≥120J; unequal thickness bridge steel with plate thickness combination of 32mm+50mm;

[0050] The size of the test plate is 600mm×150mm×50mm;

[0051] 2) The groove adopts K-type asymmetric groove, the groove angle is 50°, and the blunt edge is 2mm;

[0052] Welding material matching: XY-ER80QNH welding wire is used as the gas shielded welding wire for bottoming, the diameter of the welding wire is Ф1.2mm, and the argon-rich gas is protected, and the composition of the argon-rich gas is 80% Ar+20% CO 2 , the mechanical properties of the deposited metal are Rel is 746MPa, Rm is 833MPa, A is 17.5%, -40℃KV 2 The impact energy is 79J;

[0053] Submerged arc automatic welding uses XY-S80QNH welding wire with a diameter of Ф4.0mm and XY-AF85QNH flux combination. The mechanical properties of the deposited metal are Rel is 770MPa, Rm is 904...

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Abstract

The invention discloses a composite welding method for a full penetration T-shaped joint of high-performance weather-resistant bridge steel, and belongs to the technical field of welding of the long-span, heavy-load, high-strength, high-toughness and high-weather-resistance bridge steel. According to the key points of the technical scheme of the composite welding method, a base material of the bridge steel with tensile strength being greater than or equal to 810 MPa has the mechanical performance characteristics that the yield strength ReL is greater than or equal to 690 MPa, the tensile strength Rm is greater than or equal to 810 MPa, the elongation A is greater than or equal to 14%, and the impact energy KV2 at minus 40 DEG C is greater than or equal to 120 J; a groove adopts a K-shapedasymmetric groove, the groove angle is 50 degrees, and the truncated edge is 2 mm; and gas shielded welding is adopted for priming of two layers firstly, and then submerged automatic arc welding is conducted to fill the cover surface. The composite welding method for T-shaped joints of different thick plates is adopted to achieve the effect that under the situations that preheating is conducted to80-100 DEG C before welding, and no heat treatment is conducted after welding, the welded joint with good weld formation and mechanical performance indexes meeting the design requirements is obtained; and the high-performance weather-resistant bridge steel can be used for construction and manufacturing of steel bridges, and the impact energy KV2 at minus 40 DEG C in all areas of the joint reaches94-138 J.

Description

technical field [0001] The present invention relates to the technical field of large-span, heavy-duty bridge plate manufacturing and welding, in particular, to a high-performance weather-resistant bridge steel full-penetration T-joint compound welding method, which is suitable for tensile strength Rm ≥ 810MPa level high-performance Welding of weathering bridge steel full penetration T-joints. Background technique [0002] The Jianghan Seventh Bridge to be built in my country is a two-way 6-lane highway bridge, and its main bridge adopts a heavy-duty highway bridge with a span of 408 meters. In order to meet the requirements of my country's bridge construction towards high strength, long span, heavy load and high speed, Baowu Group developed a new generation of high strength, high toughness and high weather resistance bridge steel Q690qENH for the bridge. Its comprehensive mechanical properties It has reached the level of similar foreign steel grades, especially while improvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/18B23K9/32
CPCB23K9/16B23K9/18B23K9/32
Inventor 陈潜李慧明付建辉李方敏王员根朱东明高波郭红艳韩博王中美刘翔马得利
Owner CHINA RAILWAY JIUJIANG BRIDGE ENG
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