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810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method

A compound welding seam, 810mpa technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of lower joint performance, large heat-affected zone of weld seam, etc., achieve excellent crack resistance, weld deposit metal The effect of less filling amount and excellent low temperature toughness

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

AI Technical Summary

Problems solved by technology

The deficiencies in this document are mainly: the amount of deposited metal filling in the weld causes the heat-affected zone of the weld to be large, thereby reducing the performance of the joint

Method used

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  • 810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method
  • 810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method

Examples

Experimental program
Comparison scheme
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; equal-thickness bridge steel with plate thickness combination of 32mm+32mm;

[0040] The size of the test plate is 800mm×300mm×32mm;

[0041] 2) The groove adopts a single-sided V-shaped groove, the groove angle is 40°, the blunt edge is 2mm, and the gap is 6mm;

[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% CO2 , 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...

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; equal-thickness bridge steel with plate thickness combination of 50mm+50mm;

[0050] The size of the test plate is 800mm×300mm×50mm;

[0051] 2) The groove adopts a single-sided V-shaped groove, the groove angle is 40°, the blunt edge is 2mm, and the gap is 6mm;

[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 ...

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Abstract

The invention discloses a 810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method and belongs to the technical field of large-span and heavy-load high-strength high tenacity high weatherability bridge steel welding. The key point of the technical scheme of the 810MPa grade high-performance weather resistant bridge steel compositewelding seam liner pasting single welded butt method is that the mechanical performance characteristics of a base material of bridge steel with tensile strength of larger than or equal to 810 MPa arethat the yield strength ReL is larger than or equal to 690 MPa, the tensile strength Rm is larger than or equal to 810 MPa, the elongation percentage A is larger than or equal to 14%, and the impact power KV2 at -40 degrees centigrade is arger than or equal to 120 J; a groove adopts a single-face V-shaped groove, the groove angle is 40 degrees, and the clearance is 6 mm; and clamp plates are adopted to be assembled first, a ceramic liner is arranged on the back surface of the clearance, a joint is primed for three layers by using gas shielded welding, and then submerged arc welding filling andcovering are carried out. According to the 810MPa grade high-performance weather resistant bridge steel composite welding seam liner pasting single welded butt method, by using a composite welding ceramic liner pasting single welded butt method, the groove dimension is 40 degrees, the welding seam deposited metal filling quantity is reduced, the range of a heat-affected zone of a welding seam isreduced, and the performance of a joint is improved; and 810MPa grade high-performance weather resistant bridge steel is realized, the 810MPa grade high-performance weather resistant bridge steel is preheated to 80-100 degrees centigrade before being welded, the 810MPa grade high-performance weather resistant bridge steel is not heat-treated after being welded, and therefore, the molding of the obtained welding seam is good.

Description

technical field [0001] The invention relates to the technical field of large-span and heavy-duty bridge thick plate manufacturing and welding technology, in particular to an 810MPa-level high-performance weather-resistant bridge steel composite welding seam pad single-sided welding butt joint method. 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 improving the strength, the low-temperature impact toughness and weather resistance have also been gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/18
CPCB23K9/16B23K9/18
Inventor 高波韩博黄旭光李方敏陈潜朱东明李慧明郭红艳王员根王中美陈兵山
Owner CHINA RAILWAY JIUJIANG BRIDGE ENG
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