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GMAW welding method of low-alloy super-strength steel Q1100E thin sheet

A technology of ultra-high-strength steel and welding methods, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of low tensile strength of butt joints and untested cold bending performance, so as to facilitate industrial application and realize light weight The effect of quantification and process operability

Active Publication Date: 2019-01-18
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patent CN105522262B discloses a welding method for low-alloy ultra-high-strength steel with a yield strength of 1100MPa, so that the welded joint does not produce cold cracks while ensuring the strength. However, after butt welding of 8mm thick steel plates, the heat affected zone (0.5mm from the fusion line) ) impact energy at 0°C is only 32J, and its cold bending performance has not been tested
[0005] Chinese patent CN105598596B discloses a combined welding method for high-strength steel with a tensile strength of 1200MPa without preheating. This method uses welding wires of different types and grades when welding the bottom, filling, cover and back cover, although the tensile strength of the base metal ≥1200MPa is allowed, but the tensile strength of the butt joint is only 780MPa

Method used

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  • GMAW welding method of low-alloy super-strength steel Q1100E thin sheet
  • GMAW welding method of low-alloy super-strength steel Q1100E thin sheet
  • GMAW welding method of low-alloy super-strength steel Q1100E thin sheet

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Embodiment 1

[0029] Embodiment 1, comparative example 1-1, and the welding test plate of comparative example 1-2 select the same base metal, and the thickness of the steel plate is 8mm; the components and weight percentages of the steel are: C=0.16, Si=0.18, Mn=1.13, P=0.008, S=0.0013, Al=0.036, Nb=0.015, V=0.05, Ti=0.016, Cr=0.21, Mo=0.55, Ni=0.30, B=0.0019, CEV=0.53, the balance is Fe and not Avoid impurities; its yield strength is 1176MPa, tensile strength is 1346MPa, elongation is 16%, and impact energy at -40°C is 70J / 67J / 69J (sample size is 5mm×10mm×55mm).

Embodiment 2

[0030] The welding test plate of embodiment 2 is taken from the Q1100E steel plate of 10mm thickness, and the composition and weight percent of steel are: C=0.18, Si=0.26, Mn=0.95, P=0.011, S=0.0025, Al=0.042, Nb= 0.016, V=0.037, Ti=0.010, Cr=0.28, Mo=0.57, Ni=0.02, B=0.0018, CEV=0.52, the balance is Fe and unavoidable impurities; its yield strength is 1200MPa, and its tensile strength is 1390MPa, the elongation rate is 17%, and the impact energy at -40°C is 72J / 60J / 58J (the sample size is 7.5mm×10mm×55mm).

Embodiment 3

[0031]The welding test plate of embodiment 3 is taken from the Q1100E steel plate of 12mm thickness, and the composition and weight percent of steel are: C=0.19, Si=0.25, Mn=0.85, P=0.009, S=0.002, Al=0.025, Nb= 0.012, V=0.056, Ti=0.012, Cr=0.20, Mo=0.75, Ni=0.40, B=0.0022, CEV=0.56, the balance is Fe and unavoidable impurities; its yield strength is 1149MPa, and its tensile strength is 1374MPa, the elongation is 15.5%, and the impact energy at -40°C is 72J / 64J / 69J (the sample size is 10mm×10mm×55mm).

[0032] The 980MPa high-strength steel welding wire used in the embodiment is T Union GM-120, which is purchased from the market. The diameter of the welding wire is 1.2mm; the mechanical properties of the deposited metal are: tensile strength ≥ 980MPa, yield strength ≥ 890MPa, elongation ≥ 15%, impact energy at -40°C ≥ 47J; the main chemical composition and weight percentage are: C= 0.10, Si=0.80, Mn=1.80, Cr=0.35, Mo=0.60, Ni=2.25, P=0.014, S=0.013, the balance is Fe and unav...

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Abstract

Provided is a GMAW welding method of a low-alloy super-strength steel Q1100E thin sheet. The thickness of each steel plate is 8-12 mm, and every two steel plates same in thickness are combined in buttjoint. The method includes the following steps of machining of V-shaped edges; pretreatment; rigid control over preheating temperature, interlayer temperature and heat input amount of bottom welding,filling welling and cover surface welding for single-face welding and double-face molding; hydrogen removal treatment after welding; weld reinforcement treatment. Welding connectors have high toughness and a great cold bending property, wherein the tensile resistance strength is higher than or equal to 1,000 MPa, d is equal to 6a, and surface bending and back bending at the angle of 180 degrees are both qualified. The impact energy of weld joints, a fusion zone and a heat affected zone at -40 DEG C is higher than or equal to 27 J; meanwhile, a welding process is high in operability, industrial application is convenient, the production efficiency is high, and the welding method has an application and popularization prospect.

Description

technical field [0001] The invention belongs to the technical field of gas metal shielded welding (GMAW), and in particular relates to a GMAW welding method for a low-alloy ultra-high-strength steel Q1100E thin plate. Background technique [0002] In the face of increasingly serious environmental, resource, energy, cost and other issues, large-scale, lightweight, and high-efficiency green manufacturing has become the development direction, and the market demand for low-alloy ultra-high-strength steel with a yield strength of 1100MPa and above continues to expand , such as large-tonnage truck cranes, heavy-duty crawler cranes, large concrete pump trucks, etc. However, as the strength of the steel plate increases, the difficulty of welding increases, and cold cracks, significant strength drops, impact toughness deterioration, and cold bending cracks often occur in welded joints, which seriously restrict the popularization and use of low-alloy ultra-high-strength steel. [000...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/235B23P15/00
CPCB23K9/173B23K9/235B23P15/00
Inventor 彭宁琦罗登刘丹程浩轩张青学汪贺模
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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