High-strength high ductility gas protecting 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. It can solve the problems of unable to meet the large demand for high-strength gas-shielded welding wire and high production cost, and achieve excellent welding process performance , stable quality, easy rolling and wire drawing process

Inactive Publication Date: 2008-08-06
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are limited varieties of gas-shielded welding wires that match low-alloy high-strength steels in the domestic market. Through the search of domestic and foreign literature and patents from 1984 to the present, domestic high-strength gas-shielded welding wire patents are mostly 500-700MPa strength levels, such as Harbin Welding Research The so-called 600MPa grade HS-60, Wuhan Iron and Steel 700MPa grade weather-resistant gas-shielded welding wire, etc., the welding wire with a strength of more than 800MPa has a high alloy content, such as the Chinese patent number 200510019059.6 "Gas-shielded welding wire for welding high-strength steel", Chinese

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Welding wire steel is smelted in a 50kg vacuum furnace. During the smelting process, attention should be paid to controlling the gas content in the steel, and there is no special requirement for the smelting process. The chemical composition (by weight%) of welding wire steel is: C: 0.053, Mn: 1.48, Si: 0.39, S: 0.012, P: 0.012, Ni: 0.59, Ti: 0.092, B: 0.003, Cu: 0.63, Cr: 0.38, Als: 0.006, Mo: 0.30, and the rest are Fe and other inevitable inclusions. The steel ingot is rolled into a disc and drawn into a welding wire with a diameter of 1.2 mm.

[0029] Using 80% Ar / 20% CO 2 Mixed gas shielded welding, welding current 275A, arc voltage 29V, welding speed 33cm / min, welding line energy 15KJ / cm, gas flow 18-20L / min. The thickness of the welding test plate is 20mm, the groove angle is 45°, with a 12mm backing plate, and the root gap is 12mm. The mechanical properties of the deposited metal are: R eL =810MPa,R m =840MPa, A=16%, Z=66%, weld impact energy A kv (-20℃)=14...

Embodiment 2

[0032] A 0.5-ton electric furnace is used for smelting welding wire steel. The chemical composition (by weight %) of its welding wire steel is: C: 0.062, Mn: 1.25, Si: 0.31, S: 0.0045, P: 0.009, Ni: 0.50, Ti: 0.17, B: 0.006, Cu: 0.75, Cr : 0.20, Als: 0.010, Mo: 0.50, and the rest are Fe and other inevitable inclusions. After smelting, the welding wire steel is drawn into a welding wire with a specification of Φ1.2mm, and the surface is copper-plated to become a finished welding wire. Using mixed gas (80% Ar+20% CO 2 ) protection for welding, the welding specification is: welding current 270 ~ 280A, welding voltage 29V, welding speed 33cm / min, gas flow 18-20L / min, welding line energy 15KJ / cm. The thickness of the welding test plate is 20mm, the groove angle is 45°, with a 12mm backing plate, and the root gap is 12mm. The mechanical properties of deposited metal are: ReL=825MPa, Rm=860MPa, A=16%, Z=64%, weld impact energy A kv (-20℃)=134J, impact energy A kv (-40℃)=110J, im...

Embodiment 3

[0035] A 0.5-ton electric furnace is used for smelting welding wire steel. The chemical composition (by weight %) of its welding wire steel is: C: 0.08, Mn: 1.70, Si: 0.52, S: 0.0041, P: 0.009, Ni: 0.49, Ti: 0.12, B: 0.005, Cu: 0.65, Cr : 0.23, Als: 0.008, Mo: 0.25, and the rest are Fe and other inevitable inclusions. After smelting, the welding wire steel is drawn into a welding wire with a specification of Φ1.2mm, and the surface is copper-plated to become a finished welding wire. Carry out flat welding butt joint test of 800MPa ultra-fine grain steel with plate thickness of 12mm, using mixed gas (80% Ar + 20% CO 2 ) protection for welding. The welding specification is: welding current 250A, welding voltage 29V, welding speed 30cm / min, gas flow 20L / min, welding heat input 15KJ / cm. Tensile strength R of joint plate tension m =845MPa, broken at 17mm outside the weld, joint cold bending d=3a, 120° intact; weld impact energy A kv (-20°C) = 126J,A kv (-40°C) = 101J. . The...

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Abstract

The invention relates to a gas shielded welding wire with high strength and high toughness, which solves the defects that the existing strength grade in the technical field is unsuitable for market demand and is of high cost. The technical scheme of the invention is that the components of the welding wire (according to the weight percentage) are as follows: 0.04 to 0.10 of C, 0.30 to 0.80 of Si, 1.30 to 2.0 of Mn, 0.40 to 0.89 of Ni, 0.20 to 0.50 of Cr, 0.20 to 0.60 of Mo, 0.56 to 0.80 of Cu, 0.05 to 0.20 of Ti, 0.002 to 0.010 of B, less than 0.020 of P, less than 0.015 of S, less than 0.03 of Als and the rest of Fe and inevitable impurities. The welding wire of the invention has stable quality. The mechanical property of a deposited metal is that Rel is equal to 810MPa; Rm is equal to 840MPa; A is equal to 16 percent and Z is equal to 66 percent. The average impact power AKV in minus 20 DEG C is 141J; and the average impact power AKV in minus 40 DEG C is 128J; and the average impact power AKV in minus 60 DEG C is 70J. The welding wire is suitable for gas shielded welding of 800MPa grade of ultra-fine steel; as the content of Ni is reduced, the cost of the welding wire is reduced dramatically and the implementation is easy.

Description

technical field [0001] The invention relates to a high-strength and high-toughness gas shielded welding wire, which is 80% Ar+20% CO 2 Welding under the protection of mixed gas, the tensile strength of the weld metal is ≥800MPa, and the impact toughness at -40°C is A KV ≥47J, a gas-shielded welding wire with a wide adaptability to welding line energy. Background technique [0002] With the development of science and technology, the design of welded structures tends to be high-parameter, lightweight and large-scale. Due to its excellent performance and significant economic benefits, low-alloy high-strength steel has been more and more widely used in welded structures. This kind of steel has high strength and good toughness, which creates conditions for saving steel and reducing the weight of welded structures. For vehicles, ships, construction machinery and other operating structures, the use of low-alloy high-strength steel with good weldability can promote the developmen...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 刘吉斌缪凯王玉涛陈浮黄治军胡家国胡因洪牟文广
Owner WUHAN IRON & STEEL (GROUP) CORP
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