A gas shielded welding method for 1000mpa steel plate with thickness ≥ 40mm

A welding method and gas shielding technology, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of low matching, inconvenient actual operation, and small steel plate thickness, and achieve the purpose of avoiding welding cold cracks, excellent strength and toughness matching, and welding Seam forming good effect

Active Publication Date: 2021-07-13
武汉钢铁有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

This technology is suitable for the welding of 1000MPa high-strength steel, involving three kinds of welding materials and two kinds of welding shielding gases, and the root cleaning is required during the welding process, which brings inconvenience to the actual operation
The use of 900MPa high-strength and high-toughness welding wire is a low match for 1000MPa high-strength steel, which is not conducive to giving full play to the high-strength advantages of high-strength steel
[0006] All existing welding methods involving 1000MPa-grade high-strength steel plates adopt low-strength matching, which is suitable for small steel plates (basically below 20mm), and the use of welding methods and types of welding materials increases the replacement of welding gases, equipment, and welding wires Frequency, not conducive to on-site actual operation

Method used

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  • A gas shielded welding method for 1000mpa steel plate with thickness ≥ 40mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Gas-shielded welding is carried out with a mechanical engineering steel plate of equal thickness with a substrate test plate size of 500mm×300mm×50mm;

[0033] Its welding steps:

[0034] 1) The mechanical properties of the base material: steel Q960 for engineering machinery, with a plate thickness of 50mm and equal thickness butt joint; its mechanical properties are: yield strength R el ≥980MPa, tensile strength R m ≥1020 MPa, elongation A≥12%, impact energy at -20°C is 52J; use 20% CO 2 +80%Ar (volume percentage) argon-rich gas protection for welding;

[0035] 2) The gas shielded welding groove adopts double-sided V-shaped symmetrical groove, the groove angle is 50°, and the blunt edge is 1.2mm;

[0036] 3) Matching solid core welding wire: the mechanical properties of the welding wire deposited metal are: yield strength R el ≥930MPa, tensile strength R m ≥1000 MPa, -20°C KV2 impact energy ≥42J, elongation A≥15%; wire diameter Ф1.2mm;

[0037] 4) Welding process: ...

Embodiment 2

[0043] Gas-shielded welding is carried out with a mechanical engineering steel plate of equal thickness with a substrate test plate size of 500mm×300mm×40mm;

[0044] Its welding steps:

[0045] 1) The mechanical properties of the base material: steel Q960 for engineering machinery, with a plate thickness of 40mm and equal thickness butt joint; its mechanical properties are: yield strength R el ≥980MPa, tensile strength R m ≥1020 MPa, elongation A≥12%, impact energy at -20°C is 48J; use 20% CO 2 +80%Ar (volume percentage) argon-rich gas protection for welding;

[0046] 2) The gas shielded welding groove adopts double-sided V-shaped symmetrical groove, the groove angle is 50°, and the blunt edge is 1.5mm;

[0047] 3) Matching solid core welding wire: the mechanical properties of the welding wire deposited metal are: yield strength R el ≥930MPa, tensile strength R m ≥1000 MPa, -20°C KV2 impact energy ≥42J, elongation A≥15%; wire diameter Ф1.2mm;

[0048] 4) Welding process...

Embodiment 3

[0054] Gas-shielded welding is carried out with a mechanical engineering steel plate of equal thickness with a substrate test plate size of 500mm×300mm×50mm;

[0055] Its welding steps:

[0056] 1) Mechanical properties of base material: steel Q890 for construction machinery, plate thickness is 50mm equal thickness butt joint; its mechanical properties are: yield strength R el ≥890MPa, tensile strength R m ≥980 MPa, elongation A≥12%, impact energy at -20°C is 60J; use 20% CO 2 +80%Ar (volume percentage) argon-rich gas protection for welding;

[0057] 2) The gas shielded welding groove adopts double-sided V-shaped symmetrical groove, the groove angle is 50°, and the blunt edge is 1.6mm;

[0058] 3) Matching solid core welding wire: the mechanical properties of the welding wire deposited metal are: yield strength R el ≥930MPa, tensile strength R m ≥1000 MPa, -20°C KV2 impact energy ≥42J, elongation A≥15%; wire diameter Ф1.2mm;

[0059] 4) Welding process:

[0060] a) Preh...

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Abstract

A gas shielded welding method for 1000MPa steel plates with a thickness ≥ 40mm: mechanical properties of the base material: tensile strength R m ≥1000MPa, Elongation A≥12%, ‑20℃KV 2 Impact energy ≥ 42J; equal thickness butt welding of steel for mechanical engineering with a thickness not less than 40mm; the groove adopts double-sided V-shaped symmetrical groove, the groove angle is 50°, and the blunt edge is 1-2mm; solid welding wire; welding process : Preheat the workpiece first; fill and cover the gas shielded welding; put the weldment into the holding furnace after welding and cool to room temperature with the furnace or immediately cover the joint area within 300mm on both sides of the weld, and assist heating Cool to room temperature at 200°C. The welding seam of the invention is well formed, the tensile strength of the joint is greater than 1000MPa, and the impact energy of the welding seam is -20°C KV 2 It is not lower than the base metal, the heat-affected zone (0.5mm outside the fusion line) is not lower than 90J, and the strength and toughness of the welded joint are well matched, which fully meets the requirements.

Description

technical field [0001] The invention relates to a gas-shielded welding method for steel plates, in particular to an argon-enriched gas-shielded welding method for engineering machinery low-alloy high-strength steel thick plates with a tensile strength of 1000 MPa. Background technique [0002] In the manufacture of the main structure of mechanical equipment, the selection of high-strength grades instead of low-grade steel plates is of great importance for improving the capabilities and efficiency of equipment, prolonging service life, reducing equipment weight, reducing energy consumption, facilitating installation and transportation, and improving the overall performance of mechanical equipment. effect. In the 1990s, the high-strength steel required in China was around 600MPa. By the beginning of this century, 600MPa-900MPa high-strength steel had been used on a large scale. At present, the domestic annual demand for ultra-high-strength steel of 1000MPa and above volume in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235B23K35/30
CPCB23K9/173B23K9/235B23K35/3066
Inventor 方要治黄治军牟文广陈浮胡因红
Owner 武汉钢铁有限公司
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