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

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

Inactive Publication Date: 2002-07-17
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
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  • 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

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 (by weight%) of welding wire steel is: 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 impurity elements. 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 is 20mm, the groove...

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 composition (by weight%) of low-carbon bainite steel contains: 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 (by weight %) of the weld metal contains: 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 ...

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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 l...

Claims

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Application Information

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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 WUHAN IRON & STEEL (GROUP) CORP
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