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High-toughness gas protective welding wire for low alloy high-strength steel

A technology of gas-shielded welding wire and high-strength steel, which is applied in the direction of welding medium, welding equipment, metal processing equipment, etc., and can solve the problems that the impact toughness cannot meet the use requirements, the tensile strength of the welding wire weld metal is low, and the tensile strength cannot be stable. , to achieve the effect of easy drawing process, low cost and beautiful shape

Inactive Publication Date: 2003-11-12
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

[0002] At present, the usage of gas shielded welding wire has accounted for 31% of the output of welding materials in the United States, about 41% in Japan, about 56% in Western Europe, and only 10% of the total welding materials in China. There is no mature 700MPa gas in China. Shielded welding commodity welding wire, and the variety is single, far from meeting the growing demand for gas shielded welding of low-alloy high-strength steel
The low-matching Mn-Si series welding wire ER70S-6 is generally used in China. The disadvantage is that the tensile strength of the weld metal of the welding wire is lower than 600MPa, and the low-temperature impact toughness is poor.
The ST700 mixed gas shielded welding wire produced by ESAB has reached 700MPa in the tensile strength of the deposited metal, but its shortcoming is that the impact toughness cannot meet the requirements of the structure in low temperature service.
In 2000, Nippon Steel Corporation of Japan applied for the "Welding wire for pipeline gas shielded welding and gas shielded welding method for pipeline circular seam", patent application number JP2000218391 A. The weld metal of the gas shielded welding wire introduced has good low temperature impact toughness, but The disadvantage is that the tensile strength cannot reach 700MPa stably

Method used

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Examples

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Effect test

Embodiment 1

[0028] 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 of welding wire steel is calculated by weight percentage: C 0.063, Mn 1.77, Ni 1.25, Si 0.65, Cu 0.30, Cr 0.27, Ti 0.19, B 0.0074, S 0.0079, P 0.011, the balance is Fe and unavoidable impurities element. After smelting, the welding wire steel is processed into welding wire with a specification of Φ1.2mm through rolling, drawing, surface copper plating and other processes. The welding wire of the present invention adopts mixed gas (80% Ar+20% CO 2 ) protection for the performance inspection of deposited metal, the welding specifications are: welding current 220-260A, welding voltage 24-26V, welding speed 22cm / min, gas flow 18L / min, welding line energy 16.4kJ / cm. The thickness of the welded plate...

Embodiment 2

[0029] Embodiment 2: adopt the welding wire of the present invention in mixed gas (80%Ar+20%CO 2 ) under protected conditions for low carbon bainite steel flat welded butt joint inspection. The main chemical components of low-carbon bainitic steel include: C 0.06, Si 0.35, Mn 1.55, P 0.013, S 0.0043, Nb 0.042, Cu0.153, Ti 0.018, B 0.0011, steel plate tensile strength σ bIt is 715MPa. The welding specification is: welding current 200-220A, welding voltage 21-25V, welding speed 19cm / min, average welding heat input 15.3kJ / cm. The thickness of the welded plate is 6mm, the groove angle is 70°, the blunt edge is 1mm, and there is no gap at the root. The main chemical composition of the weld metal contains by weight percentage: C 0.047, Si0.414, Mn 1.38, P 0.011, S 0.008, Ni 0.95, Cr 0.20, Ti 0.041, B0.0070. The joint tensile test results show that the joint is broken at 17mm outside the weld, and the average impact energy of the weld metal series temperature is A kv 131J (0°C), ...

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Abstract

The chemical composition of high-toughness gas shielded welding wire for low alloy high-strength steel contains (wt%): C 0.05-0.12, Mn 1.20-2.00, Ni 0.60-1.60, Si 0.30-1.20, Cu 0.10-0.50, Cu 0.10-0.60, Ti 0.10-0.20, B 0.02-0.010, S is less than or equal to 0.10, P is less than or equal to 0.20 and the rest is Fe and inevitable impurity elements. When said welding wire is used to make mixed gas (80% Ar+20% Co2) shielded arc welding the weld metal tensile strength is 700-800 MPa, and the persuccion power at -30 deg.C Akv is greater than or equal to 80J. Said invented with is applicable to gas shielded arc welding for 700 MPa low-alloy high-strength steel, and possesses good technological performance and is suitable for welding all positions.

Description

technical field [0001] The invention relates to a high-toughness gas-shielded welding wire for low-alloy high-strength steel, which belongs to the field of welding materials. This welding wire uses mixed gas (80% Ar+20% CO 2 ) during shielded welding, the tensile strength of the weld metal is 700-800MPa, and the impact energy at -30°C is A kv ≥80J. Background technique [0002] At present, the usage of gas shielded welding wire has accounted for 31% of the output of welding materials in the United States, about 41% in Japan, about 56% in Western Europe, and only 10% of the total welding materials in China. There is no mature 700MPa gas in China. Shielded welding commodity welding wire, and a single variety, is far from meeting the growing demand for gas-shielded welding of low-alloy high-strength steel. The low-matching Mn-Si series welding wire ER70S-6 is generally used in China. The disadvantage is that the tensile strength of the weld metal of the welding wire is lower...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/32C22C38/54C22C38/58
Inventor 缪凯黄治军刘吉斌曹修悌王青峰王玉涛余酒泉肖小华张小枫胡因洪胡家国
Owner 武钢集团有限公司
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