Thick plate high-efficiency gas-slag combined protection welding method

A protective welding and high-efficiency technology, applied in welding equipment, welding accessories, welding/welding/cutting items, etc., can solve problems such as aggravating the structural safety risks of welded joints, increasing welding material consumption and energy consumption, and reducing weld performance, etc. To avoid excessive softening and embrittlement, improve performance, and reduce welding fume

Inactive Publication Date: 2020-10-13
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

Such welding grooves and angles not only increase the consumption and energy consumption of welding materials, but also easily cause welding deformation and unsafe hidden dangers in welding applications, especially for thick plate welding, which will increase the unsafety of the entire welding structure
[0008] From the results of the above documents, the gas-electric vertical welding method adopted in the prior art, due to the restrictive one-time forming of the weld seam, has a larger weldin

Method used

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  • Thick plate high-efficiency gas-slag combined protection welding method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] A thick plate high-efficiency gas slag joint protection welding method, the steps:

[0037] 1) Base metal properties: tensile strength Rm is 490MPa, thickness is 10mm; equal thickness butt vertical vertical welding;

[0038] 2) Groove form: U-shaped groove, the arc radius R at the bottom of the groove is 5mm, the groove angle is 15°, the blunt edge is 2mm, and the gap between the two U-shaped grooves of the butt welding plate is 3mm; before welding The surface of the butt joint is cleaned to a smooth state, and the cleaning and grinding width is 50mm;

[0039] 3) Welding matching material: use non-copper-coated flux-cored wire with a diameter of Φ1.6mm; the components and contents of the welding wire used in this example are the corresponding examples in Table 1;

[0040] 4) Welding process

[0041] A. Welding process conditions: the volume percentage of shielding gas is: 80% CO 2 +20%O 2 Mixed gas; DC power supply positive connection method is adopted, the welding cu...

Embodiment 2

[0047] A thick plate high-efficiency gas slag joint protection welding method, the steps:

[0048] 1) Base metal properties: tensile strength Rm is 550MPa, thickness is 25mm; equal thickness butt vertical vertical welding;

[0049] 2) Groove form: U-shaped groove, the arc radius R at the bottom of the groove is 4mm, the groove angle is 12°, the blunt edge is 1mm, and the gap between the two U-shaped grooves of the butt welding plate is 3mm; before welding The surface of the butt joint is cleaned to a smooth state, and the cleaning and grinding width is 50mm;

[0050] 3) Welding matching material: use non-copper-coated flux-cored wire with a diameter of Φ1.6mm; the components and contents of the welding wire used in this example are the corresponding examples in Table 1;

[0051] 4) Welding process

[0052] A. Welding process conditions: the volume percentage of shielding gas is: 80% CO 2 +20%O 2 Mixed gas; DC power supply positive connection method is adopted, the welding ...

Embodiment 3

[0058] A thick plate high-efficiency gas slag joint protection welding method, the steps:

[0059] 1) Base metal properties: tensile strength Rm is 450MPa, thickness is 32mm; equal thickness butt vertical vertical welding;

[0060] 2) Groove form: U-shaped groove, the arc radius R at the bottom of the groove is 4mm, the groove angle is 10°, the blunt edge is 1mm, and the gap between the two U-shaped grooves of the butt welding plate is 1mm; before welding The surface of the butt joint is cleaned to a smooth state, and the cleaning and grinding width is 50mm;

[0061] 3) Welding matching material: use non-copper-coated flux-cored wire with a diameter of Φ1.6mm; the components and contents of the welding wire used in this example are the corresponding examples in Table 1;

[0062] 4) Welding process

[0063] A. Welding process conditions: the volume percentage of shielding gas is: 80% CO 2 +20%O 2 Mixed gas; DC power supply positive connection method is adopted, the welding ...

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Abstract

The invention discloses a thick plate high-efficiency gas-slag combined protection welding method. The method comprises the following steps that according to the base material performance, Rm is 450-600 MPa, and the thickness is 10-40 mm; vertical butt welding with equal thickness is carried out; two U-shaped grooves are adopted; a copper-free flux-cored wire is adopted, wherein the diameter of the copper-free flux-cored wire is 1.6 mm; protective gas is CO2 of 80% and O2 of 20%; a straight polarity method of a direct-current power supply is adopted; a current is 300-400 A, the voltage is 32-40 V, and the welding speed is 5-15 cm/min; a welding wire conductive nozzle is located in a closed space formed by the welding grooves, a welding seam front copper sliding block and a ceramic liner, and the vertical distance between the welding wire conductive nozzle and the top of the copper sliding block is 14+/-0.1 mm; the intersection angle of the welding wire conductive nozzle and the weldingparallel line is 5-15 degrees; and during welding, a gap between the bottoms of the two U-shaped grooves is protected by the ceramic liner with an adhesive strip. According to the thick plate high-efficiency gas-slag combined protection welding method, the generation of welding stress and welding deformation can be effectively reduced, preheating is not needed before welding, heat treatment is not needed after welding, the consumption of welding materials is reduced by at least 50%, the heat input is reduced by at least 60%, and a weld joint is formed once.

Description

technical field [0001] The invention relates to a welding method of a steel plate, in particular to a gas slag joint protection welding method, and in particular to an equal-thickness butt welding method for welding steel with a welding thickness of 10 to 40 mm. Background technique [0002] In recent years, the manufacturing industries of various countries have paid more and more attention to the development of welded structures to high performance and high efficiency. With the improvement of manufacturing capacity in shipbuilding, storage tanks, large machinery and other industries, welded structures are developing towards giantization. Therefore, the application of thick plates is becoming more and more popular. As the thickness of the welded plate increases, the contradiction between welding efficiency and welding quality also emerges. At present, there are also many new welding methods to adapt to different welding scenarios, such as multi-wire submerged arc welding, ...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K9/32B23K103/04
CPCB23K9/16B23K9/235B23K9/32B23K2103/04
Inventor 陈浮黄治军陶文哲牟文广方要治
Owner 武汉钢铁有限公司
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