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Solid-cored welding wire capable of improving fatigue performance of high-strength steel welding joint of engineering machinery

A technology of solid welding wire and welding joints, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. 1000MPa, without considering the fatigue strength of welded joints and other issues, to achieve the effect of good toughness, high wear resistance and high strength

Inactive Publication Date: 2014-02-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing welding wire technologies that match the high-strength steel of construction machinery, the patented technology of "a high-strength and high-toughness gas-shielded welding wire of 800MPa" (CN 101733580A) can form a weld metal with strength comparable to that of high-strength steel for construction machinery at 800MPa Matching, can be used in coal mine machinery and equipment, however, this technology does not consider the problem of low fatigue strength of the welded joint formed; The bulk transition temperature is used to reduce the welding residual tensile stress to improve the fatigue strength of the welded joint, which greatly improves the fatigue performance of the welded joint, but the weld metal formed by the welding wire has a structure of martensite + (5~ 40)% austenite, the strength cannot reach 800~1000MPa, still can not meet the high strength and high fatigue performance technical requirements of large construction machinery equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The invention discloses a solid welding wire for improving the fatigue performance of high-strength steel welded joints of construction machinery. The chemical composition of the solid wire is: C is 0, Mn is 1.50~1.65wt%, Si is 0.40~0.55wt%, Cr is 18.00~20.00wt%, Ni is 4.00~5.50wt%, Mo is 0.50~ 0.70wt%, P≤0.002wt%, S≤0.005wt%, the balance is Fe and unavoidable impurities.

[0013] The solid welding wire prepared in this embodiment has a diameter of Φ2.5 mm, and is welded with 20 mm thick 800 MPa engineering machinery steel by argon tungsten arc welding. The chemical composition of this level of engineering machinery steel plate is: C is ≤0.12wt%, Si is 0.15~0.35wt%, Mn is 0.80~1.50wt%, Cr is 0.02~0.06wt%, Mo is 0.20~0.60wt%, P is ≤0.003wt%, and S is ≤0.015wt%. The mechanical properties of the 800MPa steel plate for construction machinery are: tensile strength ≥ 785MPa, yield strength ≥ 685MPa, elongation A = 15%; impact energy A at -20°C kv ≥47J. The bevel type of t...

Embodiment 2

[0017] The invention discloses a solid welding wire for improving the fatigue performance of high-strength steel welded joints of construction machinery. The chemical composition of the solid wire is: C is 0, Mn is 1.65~1.80wt%, Si is 0.55~0.70wt%, Cr is 14.00~18.00wt%, Ni is 5.50~6.50wt%, Mo is 0.70~ 1.20wt%, P≤0.002wt%, S≤0.005wt%, the balance is Fe and unavoidable impurities.

[0018] The welded steel plate and groove type of this embodiment are the same as that of Embodiment 1.

[0019] The solid welding wire prepared in this example has a diameter of Φ1.2mm, adopts a gas-shielded welding process with 100% argon shielding, a welding current of 285-340A, and an arc voltage of 31-33V.

[0020] After welding, analyze the mechanical properties of the weld metal and the fatigue performance of the welded joint: the yield strength of the weld metal is 698MPa, the tensile strength is 830MPa, the elongation A=13%, and the average impact energy at -20°C is A kv =47J, the average h...

Embodiment 3

[0023] The invention discloses a solid welding wire for improving the fatigue performance of high-strength steel welded joints of construction machinery. The chemical composition of the solid wire is: C is 0, Mn is 1.80~2.00wt%, Si is 0.70~0.80wt%, Cr is 12.00~14.00wt%, Ni is 6.50~8.00wt%, Mo is 1.20~ 2.00wt%, P≤0.002wt%, S≤0.005wt%, the balance is Fe and unavoidable impurities.

[0024] The solid welding wire prepared in this embodiment has a diameter of Φ2.5mm, and is welded with 20mm thick 1000MPa engineering machinery steel by argon tungsten arc welding. The chemical composition of the 1000MPa engineering machinery steel plate is: C is 0.10~0.20wt%, Si is 0.20~0.70wt%, Mn is 1.00~1.70wt%, Mo is 0.30~0.50wt%, Ni is 0.30~0.50wt% %, Cr is 0.80~1.20wt%, S≤0.02wt%, P≤0.025wt%; the mechanical properties of the steel plate are: yield strength ≥ 980MPa, tensile strength 1080~1370MPa, -20℃ impact toughness value ≥ 25J . Groove type and welding process are the same as in Example ...

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Abstract

The invention relates to a solid-cored welding wire capable of improving the fatigue performance of a high-strength steel welding joint of engineering machinery. According to the technical scheme, the chemical constituents of the solid-cored welding wire comprise 0 wt% of C, 1.50-2.00 wt% of Mn, 0.40-0.80 wt% of Si, 12.00-20.00 wt% of Cr, 4.00-8.00 wt% of Ni, 0.50-2.00 wt% of Mo, not greater than 0.002 wt% of P, not greater than 0.005 wt% of S, and the balance of Fe and inevitable impurities. The weld metal formed by using the solid-cored welding wire disclosed by the invention has the advantages of high strength, high toughness and high wear resistance, and the strength of the weld metal can be matched with the strength of 800-1000 MPa-grade high-strength steel of engineering machinery; and the welding joint is high in fatigue performance and capable of meeting the technical requirements of the welded engineering machinery and equipment on high strength and high fatigue performance.

Description

technical field [0001] The invention belongs to the technical field of solid core welding wire. In particular, the invention relates to a solid welding wire for improving the fatigue performance of high-strength steel welded joints of engineering machinery. Background technique [0002] At this stage, my country is still in the stage of rapid growth of infrastructure investment. Large-scale construction projects require large-scale, high-capacity construction machinery and equipment such as excavators, loaders and cranes. These large-scale construction machinery equipment require its components to have high strength, wear resistance and high fatigue performance, so as to be suitable for harsh working conditions and environments such as high strength, heavy load, alternating load and high frequency vibration. Therefore, the iron and steel materials used to prepare construction machinery and equipment and the welded joints used to connect iron and steel materials must also ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
Inventor 王红鸿吴开明张心保黄刚
Owner WUHAN UNIV OF SCI & TECH
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