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Gas shielded welding method of bridge steel with tensile strength Rm greater than or equal to 810 MPa

A tensile strength and protection welding technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problem of no preheating, and achieve improved root toughness, excellent low temperature toughness, and improved crack resistance. Effect

Active Publication Date: 2019-01-04
武汉钢铁有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0011] The purpose of the present invention is to solve the deficiencies in the prior art, to propose a tensile strength R m ≥810MPa bridge steel gas shielded welding method to solve the two-way 8-lane, the main bridge adopts a heavy-duty road bridge joint with a span of 408 meters, no preheating before welding, no heat treatment after welding, on the premise of ensuring safe service, through Gas-shielded welding process and matching materials welding high-strength, high-toughness, high-weather resistance bridge steel thick plate butt joints

Method used

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  • Gas shielded welding method of bridge steel with tensile strength Rm greater than or equal to 810 MPa

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Gas-shielded welding is carried out by using equal-thickness bridge steel plate with base material test plate size of 600mm×400mm×40mm;

[0036] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL : 699MPa, tensile strength R m : 842MPa, Elongation A: 17%, -40℃KV 2 The impact energy is 225J; the thickness is 40mm equal thickness bridge steel;

[0037] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 70°, and the blunt edge is 1.5mm;

[0038] 3) Two matching welding wires: the mechanical properties of the base gas shielded welding wire deposited metal are R eL =492MPa,R m =598MPa, A=27%, Z=65%, impact energy -40℃KV 2 =158J, the diameter of the welding wire is Ф1.2mm; the mechanical properties of the gas shielded welding wire for filling and covering are R eL =791MPa, R m =883MPa, A=17%, Z=64%, impact energy -40℃KV 2 =106J, the wire diameter is Ф1.2mm;

[0039] 4) Wel...

Embodiment 2

[0044] Gas-shielded welding is carried out by using equal-thickness bridge steel plate with base material test plate size of 600mm×400mm×40mm;

[0045] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL : 699MPa, tensile strength R m : 842MPa, Elongation A: 17%, -40℃KV 2 The impact energy is 225J; the thickness is 40mm equal thickness bridge steel;

[0046] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 70°, and the blunt edge is 1.5mm;

[0047] 3) Two matching welding wires: the mechanical properties of the base gas shielded welding wire deposited metal are R eL =492MPa,R m =598MPa, A=27%, Z=65%, impact energy -40℃KV 2 =158J, the diameter of the welding wire is Ф1.2mm; the mechanical properties of the gas shielded welding wire for filling and covering are R eL =791MPa, R m =883MPa, A=17%, Z=64%, impact energy -40℃KV 2 =106J, the wire diameter is Ф1.2mm;

[0048] 4) Wel...

Embodiment 3

[0053] Gas-shielded welding is carried out by using equal-thickness bridge steel plate with base material test plate size of 600mm×400mm×40mm;

[0054] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL : 704MPa, tensile strength R m : 838MPa, Elongation A: 16%, -40℃KV 2 The impact energy is 230J; the thickness is 40mm equal thickness bridge steel;

[0055] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 70°, and the blunt edge is 1.5mm;

[0056] 3) Two matching welding wires: the mechanical properties of the base gas shielded welding wire deposited metal are R eL =492MPa,R m =598MPa, A=27%, Z=65%, impact energy -40℃KV 2 =158J, the diameter of the welding wire is Ф1.2mm; the mechanical properties of the gas shielded welding wire for filling and covering are R eL =791MPa, R m =883MPa, A=17%, Z=64%, impact energy -40℃KV 2 =106J, the wire diameter is Ф1.2mm;

[0057] 4) Wel...

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Abstract

The invention relates to a gas shielded welding method of bridge steel with tensile strength Rm greater than or equal to 810 MPa. Base materials: ReL is greater than or equal to 690 MPa, Rm is greaterthan or equal to 810 MPa, A is greater than or equal to 14%, and the impact work KV2 at -40 DEG C is greater than or equal to 120 J; double-faced V-shaped symmetrical grooves are adopted; and a backing welding wire adopts a solid gas shielded welding wire of which the tensile strength is 550 MPa, and a filling and covering welding wire adopts a solid gas shielded welding wire of which Rm is greater than or equal to 810 MPa. A welding process comprises the steps of performing backing welding first by adopting CO2 gas shielded welding, and welding front and back surfaces respectively for one pass without back chipping; then performing filling and covering gas welding. According to a butt joint welded by adopting the gas shielded welding method, the impact work KV2 of a three-area impact work welding beam at 20 DEG C is 147 to 167 J, the impact work KV2 of a fusion line at 20 DEG C is 214 to 224 J, the impact work KV2 of a heat affected area (1 mm) at 20 DEG C is 215 to 227 J, the impactwork KV2 of the welding beam at -20 DEG C is 126 to 134 J, the impact work KV2 of the fusion line at -20 DEG C is 132 to 144 J, the impact work KV2 of the heat affected area (1 mm) at -20 DEG C is 142 to 159 J, the impact work KV2 of the welding beam at -40 DEG C is 96 to 108 J, the impact work KV2 of the fusion line at -40 DEG C is 125 to 139 J, the impact work KV2 of the heat affected area (1 mm) at -40 DEG C is 134 to 158 J, and the corrosion resistant index I of the welding seam is 8.89 to 9.46.

Description

technical field [0001] The invention relates to a welding method for large-span bridge steel plates, specifically belonging to the tensile strength R m ≥810MPa bridge steel gas shielded welding method, which is suitable for tensile strength R m ≥810MPa high-strength bridge structure steel 40mm thick plate joint welding. Background technique [0002] With the substantial improvement of my country's railway and highway transportation capacity, the construction scale of railway and highway bridges continues to expand, and the technical level continues to improve. The function, structure and construction technology of bridges are adapting to high speed, heavy load, large span, and good integrity. , high safety, and adopt the direction of steel structure with all-welded joints. Therefore, the requirements for strength, low temperature toughness, corrosion and other performance and welding performance of bridge steel are getting higher and higher. For example, the Jianghan Seven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K9/16B23K9/18B23K103/04
CPCB23K9/164B23K9/18B23K31/022
Inventor 刘文艳缪凯毛新平牟文广王辉郑绍鹏黄治军邹德辉何嘉
Owner 武汉钢铁有限公司
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