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High strength high tenacity high weather resistant gas protecting welding wire

A high-toughness, high-strength technology, used in welding media, welding equipment, welding equipment, etc., to achieve the effects of small spatter, stable welding arc, and excellent atmospheric corrosion resistance

Inactive Publication Date: 2005-03-16
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it failed to solve the problem of atmospheric corrosion resistance of matching welding materials for high-level weather-resistant series structural steels

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The welding wire was smelted in a 0.5-ton electric furnace, rolled and drawn into a welding wire with a diameter of 1.2 mm and copper-plated on the surface. The chemical composition (weight%) of its composition is: C: 0.06, Si: 0.49, Mn: 1.81, S: 0.005, P: 0.010, Ni: 0.62, Cr: 0.26, Ti: 0.11, B: 0.006, Cu: 0.26 , Als: 0.009, the rest are Fe and other inevitable inclusions. Argon-rich mixed gas (80% Ar + 20% CO 2 ) as a shielding gas for welding tests, the welding current is 250-260A, the welding voltage is 28V, and the welding speed is 275mm / min. Interlayer temperature ≤150°C. Weld metal yield strength ReL = 665MPa, tensile strength Rm = 735MPa, elongation A = 20%, reduction of area Z = 68%. The average impact energy of deposited metal is Akv (-20°C) = 204J, Akv (-30°C) = 182J, Akv (-40°C) = 180J, Akv (-60°C) = 173J, with excellent low temperature impact toughness.

Embodiment 2

[0023] Example 2: The welding wire was smelted in a 0.5-ton electric furnace, rolled and drawn into a welding wire with a diameter of 1.2 mm and copper-plated on the surface. The chemical composition (weight %) of its composition is: C: 0.07, Si: 0.60, Mn: 1.60, S: 0.006, P: 0.012, Ni: 0.70, Cr: 0.33, Ti: 0.14, B: 0.005, Cu: 0.35 , Als: 0.005, the rest are Fe and other inevitable inclusions. Welding wire adopts 80% Ar+20% CO 2 As shielding gas, welding 12mm thick railway locomotive speed-increasing weathering steel W400QN, the chemical composition (by weight %) of the steel mainly contains C: 0.07, Si: 0.39, Mn: 0.35, Cu: 0.30, Cr: 0.42, Ni: 0.30, P: 0.009, S: 0.006. Mechanical properties ReL = 410MPa, Rm = 535MPa. Impact energy Akv (-40°C) = 79J. The welding process is a Y-shaped groove, the blunt edge of the groove is 1mm, and the groove angle is 60°. The welding process parameters are welding current 260-270A, welding voltage 27V, and welding speed 29cm / min. The tensile...

Embodiment 3

[0024] Example 3: The welding wire was smelted in a 0.5-ton electric furnace, rolled and drawn into a welding wire with a diameter of 1.2 mm and copper-plated on the surface. The chemical composition (weight %) of its composition is: C: 0.10, Si: 0.70, Mn: 1.53, S: 0.006, P: 0.007, Ni: 0.95, Cr: 0.40, Ti: 0.17, B: 0.007, Cu: 0.40 , Als: 0.005, the rest are Fe and other inevitable inclusions. The welding wire uses argon-rich mixed gas (80% Ar+20% CO 2) as a shielding gas, the thickness of the welded A710 is 12mm, the main chemical composition (weight%) of the A710 steel type C: ≤0.07, Si: ≤0.40, Mn: ≤0.70, Cu: 1.0-1.30, Cr: 0.6 -0.90, Ni: 0.70-1.0, P: ≤0.020, S: ≤0.010. Mechanical properties ReL = 590MPa, Rm = 685Mpa, Akv (-40°C) = 260J, Akv (-80°C) = 180J. The welding process is Y-shaped groove. The blunt edge of the groove is 1mm, the groove angle is 60°, the welding process parameters are welding current 240-260A, welding voltage-27V, and welding speed 29cm / min. The ten...

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Abstract

The invention relates to a kind of high strength, high tenacity, high withering, and air protecting welding thread. It can avoid mismatching of present welding material, especially poor quality of prevent gas erode. The technique is flowing: first the chemical component is : C:0.04~0.12; Si:0.40~0.80; Mn:1.40~2.0;P<=0.020;S0.015;Ni:0.40~1.0;Cr:0.20~0.50;Ti:0.06~0.20;Cu:0.30~0.50;B:0.002~0.0079;Als<=0.02; a little Fe and other unavoidable impurities. The welding thread is protected by mix gas that is made of percent 80 Ar and percent 20 CO2. The thread head is better in gas eroding proof and mechanism. The tensile strength of the welding slot is as high as 735MPa. And AKv(-0.4 DEG C) of it is 182 J, AKv(-0.6 DEG C) of it is 173 DEG C. The thread is suited to gas protecting welding for important part of railroad, bridge, pipe and so on.

Description

1. Technical field [0001] The invention relates to a gas-shielded welding wire material for metal material welding, in particular to a gas-shielded welding wire suitable for welding high-strength, high-toughness steel grades with high weather resistance requirements. 2. Background technology [0002] With the rapid development of my country's national economy, the railway transportation industry has entered a period of rapid development. In recent years, my country's railways have carried out five large-scale speed-ups, and initially formed a "four vertical and two horizontal" speed-up network. In order to meet the requirements of railway speed increase and weight reduction, cross-sea bridges, military ships, oil pipelines, etc., the steel grades have high weather resistance, high strength, high toughness and require a strength level of 500-700MPa, so the performance of welded joints is also proposed. Higher requirements, the welded joint must have the same toughness and we...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K35/30
Inventor 缪凯黄治军曹修悌胡因洪胡家国
Owner WUHAN IRON & STEEL (GROUP) CORP
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