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Microtitanium-boron high-toughness gas protective welding stick

A technology of gas shielded welding wire and high toughness, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. Low temperature impact toughness and other problems, to achieve the effect of easy rolling and wire drawing process, low cost and good process performance

Inactive Publication Date: 2002-01-02
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is a lack of gas-shielded welding wires of corresponding strength levels in China. For a long time, the traditional Mn-Si series welding wire H08Mn2Si has been widely used. The disadvantage is that the weld metal has poor low-temperature impact toughness.
The patent invented by Yu Junchuan and others of the General Iron and Steel Research Institute of the Ministry of Metallurgical Industry (patent application number is 95108258) introduces "a kind of gas shielded welding wire". The tensile strength is low, which cannot meet the gas shielded arc welding of 600MPa low alloy steel
In addition, the MG60 gas-shielded welding wire produced by Kobe Steel in Japan, although the tensile strength of the weld metal is ≥600MPa, but the disadvantage is that the level of impact toughness is still difficult to meet the requirements of the structure under low temperature service

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: A 0.5-ton electric furnace is used to smelt welding wire steel with low S and P scrap steel. Pay attention to controlling the gas content in the steel during the smelting process, and there is no special requirement for the smelting process. The chemical composition (by weight %) of welding wire steel is: C 0.05, Mn 1.54, Si 0.50, S 0.005, P 0.005, Ni0.89, Ti 0.11, B 0.006, and the balance is Fe and other unavoidable impurities. After smelting, the welding wire steel is rolled into a 60×60×1500 (mm) billet, and then drawn into a welding wire with a specification of φ1.2 mm, which becomes the finished welding wire of the present invention after being copper-plated on the surface.

[0021] Use the welding wire of the present invention in the mixed gas (80% Ar + 20% CO 2 ) under the protection of deposited metal welding welding specifications: welding current 220 ~ 260A, welding voltage 24 ~ 26V, welding speed 22cm / min, welding line energy 16.4kJ / cm. The thick...

Embodiment 2

[0022] Embodiment 2: use welding wire of the present invention in mixed gas (80% Ar+20% CO 2 ) under the protection of low carbon bainite steel DB590 butt flat welding. The chemical composition (by weight %) of DB590 steel contains: C 0.067, Si 0.305, Mn 1.439, P 0.019, S 0.008, Nb 0.041, Cu 0.108, Ti0.021, B 0.0010. The welding specification is: welding current 200-220A, welding voltage 21-25V, welding speed 18-20cm / min, average welding line energy 15.3kJ / cm. The thickness of the welded plate is 7mm, the groove angle is 70°, the blunt edge is 1mm, and there is no gap at the root.

[0023] The chemical composition (by weight %) of the weld metal contains C 0.049, Mn 1.21, Si 0.18, S 0.006, P 0.009, Ni 0.62, Ti 0.025, B 0.0053. The mechanical properties of the weld metal are: σ b =630MPa, impact energy A at -30℃ kv =156J, impact energy A at -40℃ kv =133J (the impact test adopts non-standard sample size 5mm×10mm×55mm). The welded joints are cold-bent d=3a, 180° and intact....

Embodiment 3

[0025] Embodiment 3: The welding wire of the present invention adopts mixed gas (80% Ar+20% CO 2) protection for butt flat welding of pipeline steel X70. The chemical composition (by weight %) of X70 steel contains: C 0.06, Mn 1.46, Si0.25, S 0.003, P 0.012, Ni 0.20, Cu 0.22, Mo 0.22. The welding specification is: welding current 190-210A, welding voltage 25-27V, welding speed 24-26cm / min, welding heat input 12.5kJ / cm. The thickness of the welded plate is 11mm, the groove angle is 60°, the blunt edge is 1mm, and there is no gap at the root.

[0026] The chemical composition (by weight %) of the weld metal contains: C 0.054, Mn 1.38, Si0.23, S 0.0026, P 0.009, Ni 0.46, Cu 0.21, Cr 0.024, Ti 0.035, B0.0016. The mechanical properties of the weld metal are: σ s =575MPa, σ b =675MPa, δ 5 =24%, ψ=77%, -20°C impact energy A kv =173J, impact energy A at -30℃ kv =152J, impact energy A at -40℃ kv =148J.

[0027] Above-mentioned embodiment illustrates that welding wire of the pr...

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Abstract

The present invention relates to a micro titanium-boron high-toughness gas shielded welding wire, its chemical components (wt.%) are: C 0.03-0.10, Mn 1.00-1.80, Si 0.20-1.00, Ni 0.50-1.40, Ti 0.10-0.20, B 0.002-0.010, S less than or equal to 0.10, P less than or equal to 0.20 and the rest being Fe and other unavoidable impurity. When the welding wire is used to make protective welding by adopting mixed gas (80% Ar+20% CO2), the wield metal tensile strength is greater than or equal to 580 Mpa, -30 deg.C impact work Akv is greater than or equal to 80J, and it adapts to all-position welding. This invented welding wire possesses excellent processing property, and is suitable for gas protective arc welding of large-type structures of 600 MPa level low-alloy high strength steel, engineering machine, railway bridge, marine installation, high-pressure container and oil-gas transmission pipeline, etc.

Description

【Technical field】 [0001] The invention relates to a microtitanium-boron high-toughness gas-shielded welding wire, specifically a gas-shielded welding wire using mixed gas (80% Ar + 20% CO 2 ) during shielded welding, the tensile strength of the weld metal is ≥580MPa, and the impact energy at -30°C is A kv The welding wire ≥80J is a welding wire that can be used for gas shielded arc welding of 600MPa grade low alloy steel, and belongs to the field of welding materials. 【Background technique】 [0002] In recent years, due to its high production efficiency and low cost, gas shielded arc welding has been widely used in the production of large and important structures such as construction machinery, railway bridges, marine facilities, and high-pressure vessels. At the same time, it has become the development trend of domestic and foreign structural manufacturing industries to use steel with a strength level above 600MPa and excellent low-temperature impact toughness in the above...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22
Inventor 缪凯黄治军刘吉斌曹修悌王青峰王玉涛余酒泉张小枫于浩肖小华胡因洪
Owner 武钢集团有限公司
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