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A Submerged Arc Composite Welding Method for Bridge Steel Thick Plates with Tensile Strength≥810mpa

A tensile strength, composite welding technology, used in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of non-preheating, and achieve the effects of excellent crack resistance, excellent fracture toughness, and easy welding process operation.

Active Publication Date: 2021-02-19
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the deficiencies in the prior art, and propose a bridge steel thick plate submerged arc composite welding method with a tensile strength ≥ 810 MPa 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, and the joints have excellent comprehensive mechanical properties and weather resistance.

Method used

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  • A Submerged Arc Composite Welding Method for Bridge Steel Thick Plates with Tensile Strength≥810mpa
  • A Submerged Arc Composite Welding Method for Bridge Steel Thick Plates with Tensile Strength≥810mpa

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Effect test

Embodiment 1

[0032] The base material test plate size is 600mm×400mm×50mm for equal thickness welding;

[0033] A method for submerged arc composite welding of bridge steel thick plates with tensile strength ≥ 810MPa, the steps of which are as follows:

[0034] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL 694MPa, tensile strength R m 817MPa, elongation A17%, -40℃KV 2 The impact energy is 231J; the thickness is 50mm equal thickness bridge steel;

[0035] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 60°, and the blunt edge is 1mm;

[0036] 3) Two matching welding wires: submerged arc welding wire adopts tensile strength of 888MPa, welding wire diameter Ф4.0mm; Mechanical properties of the deposited metal of the welding wire: tensile strength R m It is 888MPa, elongation A is 17%, reduction of area Z is 65%, -40℃KV 2 The impact energy is 118J;

[0037] The tensile strength of the...

Embodiment 2

[0043] The base material test plate size is 600mm×400mm×32mm for equal thickness welding;

[0044] A method for submerged arc composite welding of bridge steel thick plates with tensile strength ≥ 810MPa, the steps of which are as follows:

[0045] 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;

[0046] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 60°, and the blunt edge is 1mm;

[0047] 3) Two matching welding wires: submerged arc welding wire adopts tensile strength of 888MPa, welding wire diameter Ф4.0mm; Mechanical properties of the deposited metal of the welding wire: tensile strength R m It is 888MPa, elongation A is 17%, reduction of area Z is 65%, -40℃KV 2 The impact energy is 118J;

[0048] The tensile strength of the...

Embodiment 3

[0054] The base material test plate size is 600mm×400mm×50mm for equal thickness welding;

[0055] A method for submerged arc composite welding of bridge steel thick plates with tensile strength ≥ 810MPa, the steps of which are as follows:

[0056] 1) Mechanical properties of the base material: The mechanical properties are characterized by: yield strength R eL 694MPa, tensile strength R m 817MPa, elongation A17%, -40℃KV 2 The impact energy is 231J; the thickness is 50mm equal thickness bridge steel;

[0057] 2) The groove adopts double-sided V-shaped symmetrical groove, the groove angle is 60°, and the blunt edge is 1mm;

[0058] 3) Two matching welding wires: submerged arc welding wire adopts tensile strength of 888MPa, welding wire diameter Ф4.0mm; Mechanical properties of the deposited metal of the welding wire: tensile strength R m It is 888MPa, elongation A is 17%, reduction of area Z is 65%, -40℃KV 2 The impact energy is 118J;

[0059] The tensile strength of the...

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Abstract

A method of submerged arc composite welding of bridge steel thick plate with tensile strength ≥810MPa: Base material mechanical properties: R eL ≥690MPa, R m ≥810MPa, A≥14%, ‑40℃KV 2 Impact energy ≥120J; 32mm and 50mm equal thickness bridge steel welding; groove: double-sided V-shaped symmetry, angle of 60°, blunt edge 1mm; welding wire: submerged arc welding wire and gas shielded welding wire; welding process: first gas shielded welding Bottoming, and then submerged arc welding cover. The joint performance of the present invention: weld R m ≥810MPa, joint cold bending d=3a, 180° qualified, weld impact energy‑40℃KV 2 ≥100J, fusion line impact energy‑40℃KV 2 ≥106 J, heat affected zone (1mm)‑40℃KV 2 ≥160J, the average impact energy of the three zones of the joint is much higher than the standard value, and the corrosion resistance index I value of the weld is ≥8.78. The third zone of the joint has high impact toughness reserve and safety margin.

Description

technical field [0001] The invention relates to a welding method for large-span bridge steel thick plates, specifically belonging to a submerged arc composite welding method for bridge steel thick plates with a tensile strength ≥ 810 MPa, which is suitable for welding tensile strength R m Welding of steel 50mm, 32mm and other thick plate joints for ≥810MPa high-strength bridge structures. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/235B23K9/16B23K9/095
CPCB23K9/095B23K9/16B23K9/18B23K9/235
Inventor 刘文艳缪凯毛新平牟文广王辉黄治军郑绍鹏邹德辉何嘉
Owner 武汉钢铁有限公司
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