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A manual composite welding method for bridge steel with tensile strength ≥ 810mpa
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A tensile strength, composite welding technology, used in welding equipment, welding equipment, auxiliary welding equipment, etc.
Active Publication Date: 2020-10-30
武汉钢铁有限公司
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[0009] The purpose of the present invention is to solve the deficiencies in the prior art, and propose a manual composite welding method for bridge steel plates with a tensile strength ≥ 810MPa, to solve the problem of two-way 8-lane, and the main bridge adopts a heavy-duty road bridge joint with a span of 408 meters. There is no preheating before welding and no heat treatment after welding. Under the premise of ensuring safe service, the structure after welding will not be deformed or cracked. The joints have excellent comprehensive mechanical properties and weather resistance. The tensile strength is ≥810MPa bridge steel Manual compound welding method for thick plate
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Embodiment 1
[0030] The size of the test plate is 600mm×400mm×32mm;
[0031] A manual compound welding method for bridge steel with tensile strength ≥ 810MPa, the steps:
[0032] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL 705MPa, tensile strength R m 874MPa, elongation A16%, -40℃KV 2 The impact energy is 210J; the thickness is 32mm equal thickness bridge steel;
[0033] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 60°, and the blunt edge is 1.5mm;
[0034] 3) Two matching welding consumables: the tensile strength of the manual electrode is 872MPa, and the diameter of the electrode is Ф4.0mm; the baking system of the electrode is 380℃×1h; the tensile strength of the gas shielded welding wire is 880MPa, and the diameter of the electrode is Ф1.2mm;
[0036] a) First use gas-shielded welding for 1 pass, the welding current is 262~266A, the welding volt...
Embodiment 2
[0040] The size of the test plate is 600mm×400mm×32mm;
[0041] A manual compound welding method for bridge steel with tensile strength ≥ 810MPa, the steps:
[0042] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL 705MPa, tensile strength R m 874MPa, elongation A16%, -40℃KV 2 The impact energy is 210J; the thickness is 32mm equal thickness bridge steel;
[0043] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 60°, and the blunt edge is 1.5mm;
[0044] 3) Two matching welding consumables: the tensile strength of the manual electrode is 872MPa, and the diameter of the electrode is Ф4.0mm; the baking system of the electrode is 380℃×1h; the tensile strength of the gas shielded welding wire is 880MPa, and the diameter of the electrode is Ф1.2mm;
[0046] a) First use gas-shielded welding for 1 pass, the welding current is 265~270A, the welding volt...
Embodiment 3
[0050] The size of the test plate is 600mm×400mm×32mm;
[0051] A manual compound welding method for bridge steel with tensile strength ≥ 810MPa, the steps:
[0052] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL 711MPa, tensile strength R m 862MPa, elongation A16%, -40℃KV 2 The impact energy is 220J; the thickness is 32mm equal thickness bridge steel;
[0053] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 60°, and the blunt edge is 1.5mm;
[0054] 3) Two matching welding consumables: the tensile strength of the manual electrode is 872MPa, and the diameter of the electrode is Ф4.0mm; the baking system of the electrode is 380℃×1h; the tensile strength of the gas shielded welding wire is 880MPa, and the diameter of the electrode is Ф1.2mm;
[0056] a) First use gas-shielded welding for 1 pass, the welding current is 265~270A, the welding volt...
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Abstract
Provided is a manual combined welding method for bridge steel with the tension strength being larger than or equal to 810 MPa. As for the mechanical properties of a base material, ReL is greater thanor equal to 690 MPa, Rm is greater than or equal to 810 MPa, A is greater than or equal to 14%, and KV2 impact power at minus 40 DEG C is greater than or equal to 120 J; welding of the equal-thicknessbridge steel being 32 mm thick is carried out; a groove is in a dual-sided V-type symmetrical mode, the angle is 60 degrees, and the truncated edge is 1.5 mm; manual electrodes and gas shielded welding wires are adopted; and a welding process comprises the steps that gas shielded arc welding is carried out for bedding and then manual cover face welding is carried out. According to the connector performance, Rm of a weld joint is greater than or equal to 879 MPa, KV2 under 20 DEG C of the weld joint is greater than or equal to 148 J, KV2 under 20 DEG C of a fusion line is greater than or equalto 172 J, and KV2 under 20 DEG C of a heat affected zone (1mm) is greater than or equal to 219 J; KV2 under minus 20 DEG C of the weld joint is greater than or equal to 116 J, KV2 under minus 20 DEGC of the fusion line is greater than or equal to 177 J, and KV2 under minus 20 DEG C of the heat affected zone (1mm) is greater than or equal to 215 J; KV2 under minus 40 DEG C of the weld joint is greater than or equal to 82 J, KV2 under minus 40 DEG C of the fusion line is greater than or equal to 117 J, and KV2 under minus 40 DEG C of the heat affected zone (1mm) is greater than or equal to 160J; and the three sections of a connector have high impacttoughness reserve and safety margin.
Description
technical field [0001] The invention relates to a welding method for large-span bridge steel thick plates, specifically belongs to a manual composite welding method for bridge steel with tensile strength ≥ 810MPa, which is suitable for welding tensile strength R m ≥810MPa high-strength bridge structure steel 32mm 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,...
Claims
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Application Information
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