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Butt-joint manual welding method for high-strength bridge steel with thickness of 80 mm

A manual welding, high-strength technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of construction environment, manufacturing cost and manufacturing cycle difficulties, unable to meet the technical requirements of construction, etc., to achieve high impact toughness reserve and The effect of safety margin, excellent low temperature performance and crack resistance, excellent low temperature impact toughness and crack resistance

Inactive Publication Date: 2012-11-21
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the manufacturing process of large-scale steel structures, pre-weld preheating and post-weld heat treatment mean that the construction environment, manufacturing cost and manufacturing cycle are difficult, and cannot meet the technical requirements of construction.

Method used

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  • Butt-joint manual welding method for high-strength bridge steel with thickness of 80 mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Base material: the tensile strength is R m 600MPa, yield strength R eL 500MPa, elongation: A is 25%, impact energy -40 o CKV 2 Butt welding of equal-thickness bridge steel of 223J and thickness of 80 mm; the matching welding wire tensile strength is greater than 600 MPa, and the diameter of the welding rod is Ф4.0mm; Type double-sided symmetrical bevel, the bevel angle is 60°, and the blunt edge is 2mm;

[0026] Welding material matching: the chemical composition and weight percentage of the electrodes used are C 0.040~0.060, Si 0.25~0.40, Mn 1.20~1.50, Ni 1.2~1.50, Mo 0.20~0.30 P 0.008~0.012, S 0.003~0.005; Prepared for iron and unavoidable impurities; the mechanical properties of the deposited metal of the electrode are R el : 540MPa, R m : 650 MPa, elongation A: 28%, impact energy -40℃KV 2 : 150J;

[0027] Welding process: Welding current 165A, welding voltage 24V, welding speed 15cm / min, welding line energy 16kJ / cm, manual welding butt joints adopt multi-laye...

Embodiment 2

[0030] Base material: the tensile strength is R m 605MPa, yield strength R eL 505MPa, elongation: A is 23%, impact energy -40 o CKV 2 Butt welding of equal-thickness bridge steel of 233J and thickness of 80 mm; the matching welding wire tensile strength is greater than 600 MPa, and the diameter of the welding rod is Ф4.0mm; Type double-sided symmetrical bevel, the bevel angle is 60°, and the blunt edge is 2mm;

[0031]Welding material matching: the chemical composition and weight percentage of the electrodes used are C 0.040~0.060, Si 0.25~0.40, Mn 1.20~1.50, Ni 1.2~1.50, Mo 0.20~0.30 P 0.008~0.012, S 0.003~0.005; Prepared for iron and unavoidable impurities; the mechanical properties of the deposited metal of the electrode are R el : 540MPa, R m : 650 MPa, elongation A: 28%, impact energy -40℃KV 2 : 150J;

[0032] Welding process: Welding current 170A, welding voltage 25V, welding speed 15cm / min, welding line energy 17kJ / cm, manual welding butt joints adopt multi-layer...

Embodiment 3

[0035] Base material: the tensile strength is R m 595MPa, yield strength R eL is 490MPa, elongation: A is 24%, impact energy -40 o CKV 2 Butt welding of equal-thickness bridge steel of 219J and thickness of 80 mm; the matching welding wire tensile strength is greater than 600 MPa, and the diameter of the welding rod is Ф4.0mm; Type double-sided symmetrical bevel, the bevel angle is 60°, and the blunt edge is 2mm;

[0036] Welding material matching: the chemical composition and weight percentage of the electrodes used are C 0.040~0.060, Si 0.25~0.40, Mn 1.20~1.50, Ni 1.2~1.50, Mo 0.20~0.30 P 0.008~0.012, S 0.003~0.005; Prepared for iron and unavoidable impurities; the mechanical properties of the deposited metal of the electrode are R el : 540MPa, R m : 650 MPa, elongation A: 28%, impact energy -40℃KV 2 : 150J;

[0037] Welding process: Welding current 165A, welding voltage 24V, welding speed 14cm / min, welding line energy 17kJ / cm, manual welding butt joints adopt multi-l...

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Abstract

The invention provides a butt-joint manual welding method for high-strength bridge steel with a thickness of 80 mm. The butt-joint manual welding method comprises the following steps of: using an equal-thickness bridge steel to carry out butt joint, wherein the equal-thickness bridge steel has Rm which is more than or equal to 570 MPa, ReL which is more than or equal to 420 MPa, an extension rate A which is more than or equal to 18%, KV2 at minus 40 DEG C which is more than or equal to 120J and the thickness of 80 mm; and the anti-tension strength of a matched welding wire is more than or equal to 600 MPa, and a diameter phi of a welding bar is 4.0 mm; a welding groove is an X type symmetrical groove, a groove angle is 60 degrees; and continuously welding in conditions of current of 165-170 A, voltage of 24-25V, a speed of 14-15 cm / min and linear energy of 16-17 kJ / cm, and controlling an interlayer temperature within a range of 135-145 DEG C. According to the butt-joint manual welding method provided by the invention, although the thickness of the bridge steel is up to 80 mm, no crack is generated through crack detection after a butt-joint connector is subjected to treatment without pre-heating before welding and without heating after welding. Furthermore, the impact power of KV2 of three areas of the connector at minus 40 DEG C reaches to 155-243 J, so that the technical requirements of manufacturing a large-span bridge structure can be entirely met.

Description

technical field [0001] The invention relates to a method for manual welding of 80 mm thick high-strength bridge steel, which is suitable for welding tensile strength R m ≥570MPa grade high-strength bridge engineering thick plate structural steel, which belongs to the field of long-span bridge thick plate manufacturing and welding technology. Background technique [0002] As the overall design of bridge welded structures is gradually developing towards high strength, large span, heavy load, and high speed, this puts forward higher and higher requirements for the performance of steel for welded structures. For the Yangtze River Bridge, its design requires the tensile strength to be 600~700MPa, and the thickness of the base material is required to be 80 mm, which is the maximum thickness used for the first time in the construction of bridge steel structures, and the safety performance of bridge manufacturing is very strict. Require. This not only proposes a higher matching fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K33/00B23K35/30
Inventor 缪凯牟文广黄治军李立军王靓钟如涛陈浮胡家国胡因洪刘文艳
Owner 武钢集团有限公司
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