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Welding method of low-alloy ultra-high-strength steel with yield strength of 1100mpa

A technology of yield strength and ultra-high-strength steel, which is applied in the field of ultra-high-strength steel welding, can solve problems such as restricting production efficiency and being unsuitable for ultra-high-strength steel welding, so as to reduce steel consumption and energy consumption, excellent welding process performance, and applicable convenient effect

Active Publication Date: 2018-08-17
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the welding processes in the prior art are aimed at steel plates with a maximum yield strength of only about 900 MPa. There is no record of welding processes suitable for such ultra-high-strength steel with a yield strength of 1100 MPa. For example, the authorized announcement number is "CN102179606", The patent name is "a welding process for 1000MPa grade non-quenched and tempered high-strength steel", and the authorized announcement number is "CN105014208", the patent name is "a welding method for 900MPa grade high-strength steel", and the authorized announcement number is It is "CN101733562", and the patent name is "900MPa high-strength steel combined welding method without preheating". In these technologies, the yield strength of the steel plate is only about 900MPa, and after welding, it is tempered at 470-490°C, which is not suitable for ultra-high-strength Martens Welding of body steel, and different types and grades of electrodes or wires are used for backing, filling and cover welding, which seriously restricts production efficiency and is not suitable for welding ultra-high-strength steel

Method used

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  • Welding method of low-alloy ultra-high-strength steel with yield strength of 1100mpa
  • Welding method of low-alloy ultra-high-strength steel with yield strength of 1100mpa
  • Welding method of low-alloy ultra-high-strength steel with yield strength of 1100mpa

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Experimental program
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Effect test

Embodiment 1

[0031] The welding method of low-alloy ultra-high-strength steel with a yield strength of 1100MPa is as follows:

[0032] The steel plate to be welded is ultra-high-strength low-alloy steel with a yield strength of 1100MPa, and the combination of plate thickness is 8mm+8mm;

[0033] 1) The chemical composition weight percentage of base metal is: C 0.15-0.22%, Si 0.20-0.60%, Mn 0.60-1.50%, Cr 0.30-0.80%, Ni 0.400-1.60%, Mo 0.10-0.7%, Nb 0.01- 0.05%, V 0.01-0.05%, Al 0.02-0.08%, the production process of the base metal is smelting-continuous casting-controlled rolling and controlled cooling (TMCP)-quenching+tempering, the mechanical properties of the base metal: R p0.2 =1138MPa, R m =1300MPa, A 50 =9%, -40 longitudinal impact average value 27J;

[0034] 2) Matching welding material: EDFK1000 welding wire, diameter 1mm, yield strength of welding wire (R p0.2 )≥900MPa, tensile strength (R m )≥1000MPa, elongation (A)≥11%, -40℃ impact energy (Akv)≥27J;

[0035] 3) Protective g...

Embodiment 2

[0045] The welding method of low-alloy ultra-high-strength steel with a yield strength of 1100MPa is as follows:

[0046] The steel plate to be welded is ultra-high-strength low-alloy steel with a yield strength of 1100MPa, and the combination of plate thickness is 30mm+30mm;

[0047] 1) The chemical composition weight percentage of base metal is: C 0.15-0.22%, Si 0.20-0.60%, Mn 0.60-1.50%, Cr 0.30-0.80%, Ni 0.400-1.60%, Mo 0.10-0.7%, Nb 0.01- 0.05%, V 0.01-0.05%, Al 0.02-0.08%, the production process of the base metal is smelting-continuous casting-controlled rolling and controlled cooling (TMCP)-quenching+tempering, the mechanical properties of the base metal: R p0.2 =1138MPa, R m =1380MPa,A 50 =11.8%, -40 longitudinal impact average value 44J;

[0048] 2) Matching welding material: EDFK1000 welding wire, diameter 1.2mm, the chemical composition weight percentage of welding wire is: C0.1-0.15%, Si 0.5-1.0%, Mn 1.5-2.0%, Cr 0.25-0.5%, Ni 2.0- 2.4%, Mo 0.4-0.8%, P≤0.015%, S≤...

Embodiment 3

[0057] Other operating steps are basically the same as in Embodiment 2 of the present invention, except that the plate thickness combination is 4mm+4mm, and the parameter of welding heat energy is controlled between 10-12KJ / cm.

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Abstract

The invention provides a welding method for low-alloy and ultrahigh-strength steel with the yield strength being 1100 MPa. The welding method comprises the steps of pre-heating welding base metal with the yield strength higher than 1100 MPa to 150-170 DEG C; selecting the mixed gas of argon gas and carbon dioxide as the protective gas after the welding base metal of the same plate thickness are connected in a butt joint mode, carrying out continuous welding through welding wires with the yield strength higher than 900 MPa and the diameter ranging from 1 mm to 1.2 mm, controlling the interpass temperature of welding beads to range from 150 DEG C to 250 DEG C and controlling the weld heat input to range from 9 KJ / cm to 15 KJ / cm; carrying out hydrogen removal treatment after welding, wherein the preservation temperature ranges from 200 DEG C to 220 DEG C and the temperature preservation time is longer than 1 hour. According to the invention, small heat input and argon-rich mixed gas shielding welding is adopted, the strength of welded joints is guaranteed, and the toughness and the plasticity of the welded joints are improved.

Description

technical field [0001] The invention relates to the technical field of ultra-high-strength steel welding, in particular to a welding method for low-alloy ultra-high-strength steel with a yield strength of 1100 MPa. Background technique [0002] With the increasing attention to environmental issues and the increasingly fierce market competition, the strength of steel structures has risen rapidly from 400MPa to 700MPa, 900MPa, 1100MPa and even 1300MPa. People's attention, using it to manufacture components such as beam structures of construction machinery, booms of cranes, and car bodies of dump trucks can not only meet their strength requirements, but also reduce the weight of equipment, reduce fuel consumption, and reduce costs. Reduce pollution to the environment. With the development of the construction machinery industry in the direction of "three highs and one large", ultra-high-strength weldable structural steel is used to manufacture beam structures of port machinery,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/16B23K9/095B23K9/235B23K9/23
CPCB23K9/095B23K9/164B23K9/23B23K9/235B23K2103/04
Inventor 王昭东温长飞邓想涛王国栋刘丽华闫强军姜在伟
Owner NORTHEASTERN UNIV LIAONING
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