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A composite welding method for high-strength bridge steel K-type joints

A composite welding, high-strength technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of K-type joints without preheating and heat treatment, etc., and achieve excellent low temperature performance, crack resistance, and high impact toughness The Effect of Reserves and Safety Margins

Inactive Publication Date: 2017-11-07
武汉钢铁有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies in the prior art, and propose a composite welding method for high-strength bridge steel using K-type joints of different thicknesses, so as to solve the problem of the K-type joints of large-span high-strength bridge steels with different thicknesses in the weld seam. The problem of no preheating before welding and no heat treatment after welding

Method used

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  • A composite welding method for high-strength bridge steel K-type joints

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Experimental program
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Effect test

Embodiment 1

[0030] Its welding process:

[0031] a) First use gas-shielded welding to make the front and back each one pass, the welding current is 251~258A, the welding voltage is 26V, the welding speed is 18m / h, and the welding line energy is 15kj / cm; the volume percentage is 20% CO 2 Add 80% Ar-rich argon as shielding gas, and weld under the condition of its flow rate of 20L / min, and control the interlayer temperature at 103°C;

[0032] b) Carry out submerged arc welding until the weld seam is filled. The welding current is 660A, the welding voltage is 30V, the welding speed is 21m / h, the welding line energy is 34kj / cm, and the interlayer temperature is controlled at 120°C.

[0033] After testing the mechanical properties of the welded composite joints, the tensile strength of the weld seam R m 586MPa, weld impact energy -40℃KV 2 174J, heat-affected zone (1mm) -40℃KV 2 for 198 J.

Embodiment 2

[0035] Its welding process:

[0036] a) First use gas-shielded welding to make the front and back each one pass, the welding current is 259~266A, the welding voltage is 27V, the welding speed is 16m / h, and the welding line energy is 17kj / cm; the volume percentage is 20% CO 2 Add 80% Ar-rich argon as shielding gas, and weld under the condition of its flow rate of 18L / min, and control the interlayer temperature at 118°C;

[0037] b) Carry out submerged arc welding until the weld seam is filled. The welding current is 660A, the welding voltage is 30V, the welding speed is 21m / h, the welding line energy is 34kj / cm, and the interlayer temperature is controlled at 120°C.

[0038] After testing the mechanical properties of the welded composite joints, the tensile strength of the weld seam R m 580MPa, weld impact energy -40℃KV 2 171J heat-affected zone (1mm) -40℃KV2 It is 210J.

Embodiment 3

[0040] Its welding process:

[0041] a) First use gas-shielded welding to make the front and back each one pass, the welding current is 264~269A, the welding voltage is 27V, the welding speed is 17m / h, and the welding line energy is 14kj / cm; the volume percentage is 20% CO 2 Add 80% Ar-rich argon as shielding gas, and weld under the condition of its flow rate of 19L / min, and control the interlayer temperature at 109°C;

[0042] b) Carry out submerged arc welding until the weld is filled. The welding current is 660A, the welding voltage is 30V, the welding speed is 21m / h, the welding line energy is 34kj / cm, and the interlayer temperature is controlled at 125°C.

[0043] After testing the mechanical properties of the welded composite joints, the tensile strength of the weld seam R m 582MPa, weld impact energy -40℃KV 2 173J heat-affected zone (1mm) -40℃KV 2 For 192J.

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Abstract

Provided is a method for hybrid welding of a high-strength bridge steel K type joint. The mechanical properties of a base material of the high-strength bridge steel K type joint are that Rm is 662-688 MPa, RelReL is 560-611, the ductility is 23-24%, KV2 impact energy is 281-296 J at -40 DEG C, and different-thickness bridge steel is 32 mm+40 mm in thickness; double-sided K type asymmetric grooves are adopted, the groove angle is 50 degrees, and the truncated edge is 2 mm; a WH65Q welding wire and SJ105Q welding flux are adopted for submerged arc welding, the diameter of the welding wire is phi 4.0 mm; WH70Q is adopted for a gas protecting welding wire, and the diameter of the welding wire is phi 1.2 mm; the welding is performed, first gas protecting welding is adopted for bottoming, and then submerged arc welding is performed until a weld joint is filled. The method for hybrid welding of K type joints of different-thickness plates is adopted, so as to solve the problem that the K type joints of different-thickness plates made of large-span high-strenght bridge steel is not preheated prior to weld joint welding and does not undergo heat treatment after the welding, and the KV2 impact energy of the joint reaches 135-223 J at -40 DEG C.

Description

technical field [0001] The invention relates to a welding method for large-span bridge steel thick plates, which specifically belongs to the composite welding process of high-strength bridge steel K-type joints, which is suitable for welding tensile strength R m Welding of K-type joints of different thick steel plates for ≥630MPa high-strength bridge structures. Background technique [0002] The Hutong Yangtze River Bridge under construction in my country is a long-span public and railway bridge with 6-line highway and 4-line railway. Its main bridge adopts a highway-rail cable-stayed bridge with a span of 1092 meters. It will become the bridge with the largest span for road and railway in the world. In order to meet the requirements of high-strength, long-span, heavy-load and high-speed development of bridge construction in my country, Wuhan Iron and Steel (Group) Company developed a new generation of high-strength and high-toughness bridge steel Q500qE for the bridge. Its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/18B23K33/00B23K35/38B23K101/18B23K103/04
CPCB23K9/16B23K9/18B23K33/00B23K35/383
Inventor 缪凯李方敏魏振鑫牟文广王辉郑江鹏郭红艳周运武
Owner 武汉钢铁有限公司