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Gas protection wire for steel

A gas shielding and welding wire technology, which is applied in the field of welding materials in the field of welding technology, can solve problems such as limitations and the welding wire cannot meet the design requirements, and achieve the effect of good low temperature toughness

Active Publication Date: 2007-10-24
JIANGSU ZHONGJIANG WELDING WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-strength steel with a strength exceeding 900MPa, the welding wire cannot meet the design requirements when high-strength matching is required. For example, the strength of welded joints in shipbuilding needs to exceed the strength of the base metal, and ship structures that need to be welded with high-strength steel are subject to limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The gas shielded welding wire for steel of this embodiment has the chemical composition and content of the deposited metal (mass fraction%):

[0034] C: 0.019%

[0035] Mn: 2.0%

[0036] Si: 0.33%

[0037] Ni: 5.60%

[0038] Mo: 2.5%

[0039] Ti: 0.011%

[0040] Cr: ;0.35%

[0041] Cu: 0.34%

[0042] Mg: 0.010%

[0043] S: 0.0089%

[0044] P: 0.010%

[0045] The balance is Fe.

[0046] The manufacturing process of this embodiment is as follows: select pure iron, and appropriate alloying element ratios, and carry out vacuum smelting. C is not added during smelting, Mn and Mg are added last in sequence, and inert gas protection is used to prevent evaporation during addition. After all the alloying elements are melted for 20 minutes, it is poured into an ingot, and then the finished welding wire is made through forging, rolling, coiling and wire drawing. The diameter of the welding wire can be drawn into a welding wire of 1.2mm according to the needs.

[0047] T...

Embodiment 2

[0049] The gas shielded welding wire for steel of this embodiment has the chemical composition and content of the deposited metal (mass fraction%):

[0050] C: 0.014%

[0051] Mn: 2.5%

[0052] Si: 0.02%

[0053] Ni: 5.6%

[0054] Mo: 3.0%

[0055] Ti: 0.019%

[0056] Cr: 0.35%

[0057] Cu: 0.35%

[0058] Mg: 0.004%

[0059] S: 0.0095%

[0060] P: 0.009%

[0061] The balance is Fe.

[0062] The manufacturing process of this embodiment is the same as that of Embodiment 1.

[0063] The welding and mechanical performance tests of the welding wire deposited metal test plate in this embodiment are carried out in accordance with GB8110-87 / 95—the steel welding wire standard for carbon dioxide gas shielded welding. The test plate is Q345 steel, the size is 450mm×150mm×20mm, and the groove angle is 45 °, isolation layer thickness > 3mm, welding voltage: 27-31V, welding current: 260-290A, welding speed: 5.5mm / s, interlayer temperature: 150℃, shielding gas Ar+CO 2 Mixed gas, fl...

Embodiment 3

[0068] The gas shielded welding wire for steel of this embodiment has the chemical composition and content of the deposited metal (mass fraction%):

[0069] C: 0.04%

[0070] Mn: 1.5%

[0071] Si: 0.16%

[0072] Ni: 5.98%

[0073] Mo: 3.20%

[0074] Ti: 0.40%

[0075] Cr: 0.60%

[0076] Cu: 0.40%

[0077] Mg: 0%

[0078] S: 0.0086%

[0079] P: 0.009%

[0080] The balance is Fe.

[0081] During the smelting of this embodiment, C takes the upper limit addition amount, Mn takes the lower limit addition amount, Ti takes the upper limit addition amount, and does not add Mg. Other manufacturing processes are the same as in Example 1.

[0082] The welding and mechanical performance tests of the welding wire deposited metal test plate in this embodiment are carried out in accordance with GB8110-87 / 95—the steel welding wire standard for carbon dioxide gas shielded welding. The test plate is Q345 steel, the size is 450mm×150mm×20mm, and the groove angle is 45 °, isolation lay...

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Abstract

The invention relates to a steel used gas protective welding wire. Its composition is as follows: C: 0. 003%-0. 04%; Mn: 1. 5%-3%; Si: 0. 02%-0. 4%; Ni: 2%-6%; Mo: 1%-3. 2%; Ti: 0%-0. 4%; Cr: 0. 01%-0. 6%; Cu: 0. 2%-0. 4%; Mg: 0%-0. 1%; S: <=0. 01%; P: <=0. 02%, with the rest being Fe. The invented welding juncture has fine comprehensive feature, particularly high strength, and fine low temperature flexibility. The low hardness is beneficial to corrosion resistance.

Description

technical field [0001] The invention relates to a welding material in the field of welding technology, in particular to a gas-shielded welding wire for steel. Background technique [0002] In the existing technology, with the advancement of metallurgical technology, it is possible to smelt ultra-low carbon and high-clean steel, and the application of microalloying, deformation strengthening theory and research results on the relationship between material composition, structure and performance has successfully developed a high-quality Uniformity, ultra-fine grain, high strength and high toughness of a new generation of steel, the research and development of this steel has developed rapidly in Japan, South Korea, the European Union, China and other countries. But relatively speaking, the structure and performance of welded joints are relatively weak links in the entire structure. Because the cleanliness of the weld metal is low, the structure is coarse, and there is inhomogen...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 薛小怀冯涛吴鲁海
Owner JIANGSU ZHONGJIANG WELDING WIRE
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