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Welding joint of low-alloy and ultrahigh-strength steel and welding method

An ultra-high-strength steel and welded joint technology, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve the problem of difficult implementation of precise preheating of the overall structure, difficult control of bainite content, and low impact energy of welded joints. and other problems, to achieve the effects of controllable bainite structure content, improved welding efficiency, and improved crack resistance of welds

Active Publication Date: 2020-11-03
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the laser-arc hybrid welding process has the advantages of fast welding speed, large weld penetration, and low heat input, and the obtained welded joints have high strength, the impact energy of the welded joints using this welding material is low, and the weld microstructure The bainite content in the weld is difficult to control, and the super strong weld root is easy to cause root cracks
For large equipment structural parts, it is difficult to accurately preheat the overall structure when using pre-weld preheating and post-weld heat treatment
[0004] At present, there have been reports on the application of laser-arc hybrid welding technology to ultra-high-strength steel welding, such as the invention patent application with application number CN201510649015.5 "A laser-MAG welding method for medium-thick ultra-high-strength steel plate" (application publication number is CN105108341A ) discloses a laser-MAG welding method for medium-thick ultra-high-strength steel plates, which solves the problems of pre-weld preheating and post-weld heat treatment, but its welding efficiency is low; Laser-MAG Composite Welding Method for Tailored Welding of High-Strength or Ultra-High-Strength Steel in Thick Plates" (Application Publication No. CN103252589A) discloses a laser-arc composite heat source welding method for high-strength or ultra-high-strength steel, which realizes high-speed welding of ultra-high-strength steel Welding that matches high strength, but the impact energy of welded joints is low, which cannot meet the needs of high strength and toughness

Method used

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  • Welding joint of low-alloy and ultrahigh-strength steel and welding method
  • Welding joint of low-alloy and ultrahigh-strength steel and welding method
  • Welding joint of low-alloy and ultrahigh-strength steel and welding method

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Embodiment 1

[0030] Such as figure 1 and 2 Shown, be the preferred embodiment 1 of the welding joint of a kind of low-alloy ultra-high strength steel of the present invention and welding method, wherein the concrete process of welding method is as follows:

[0031] (1) Welding workpiece and welding material

[0032]The welded workpiece is Mn-Cr-Ni-Mo low-alloy quenched and tempered ultra-high-strength steel of 1600MPa grade, with a size of 300×150×15mm. The first welding gun uses high-strength martensitic welding wire with a diameter of 1.2mm, and its chemical composition is: C0.08%, Mn1.31%, Si 0.62%, Ni 5.81%, Cr 12.51%, Mo 0.67%; the second welding gun High-toughness bainite welding wire with a diameter of 1.2mm is used, and its chemical composition is: C 0.02%, Mn 1.76%, Si 0.12%, Ni 1.45%, Cr 0.23%, Mo0.81%, Ti 0.13%.

[0033] (2) Preparation before welding

[0034] The low-alloy ultra-high-strength steel with a thickness of 15mm is butt welded, and the joint is processed into an ...

Embodiment 2

[0042] Such as image 3 Shown, be the preferred embodiment 2 of the welding joint of a kind of low-alloy ultra-high strength steel of the present invention and welding method, wherein the specific process of welding method is as follows:

[0043] (1) Welding workpiece and welding material

[0044] The welding workpiece is Mn-Cr-Ni-Mo low-alloy quenched and tempered ultra-high-strength steel of 1600MPa grade, with a size of 300×150×20mm. The first welding gun uses high-strength martensitic welding wire with a diameter of 1.6mm, and its chemical composition is: C0.10%, Mn1.40%, Si 0.68%, Ni 5.52%, Cr 12.21%, Mo 0.77%; the second welding gun High-toughness bainite welding wire with a diameter of 1.2mm is used, and its chemical composition is: C 0.02%, Mn 1.76%, Si 0.12%, Ni 1.45%, Cr 0.23%, Mo0.81%, Ti 0.13%.

[0045] (2) Preparation before welding

[0046] The low-alloy ultra-high-strength steel with a thickness of 20mm is butt welded, and the joint is processed into an X-sha...

Embodiment 3

[0054] A welded joint of low-alloy ultra-high-strength steel and a welding method, wherein the specific process of the welding method is as follows:

[0055] (1) Welding workpiece and welding material

[0056] The welding workpiece is Mn-Cr-Ni-Mo low-alloy quenched and tempered ultra-high-strength steel of 1600MPa grade, with a size of 300×150×25mm. The first welding gun uses high-strength martensitic welding wire with a diameter of 1.6mm, and its chemical composition is: C0.10%, Mn1.40%, Si 0.68%, Ni 5.52%, Cr 12.21%, Mo 0.77%; the second welding gun High-toughness bainite welding wire with a diameter of 1.2mm is used, and its chemical composition is: C 0.02%, Mn 1.76%, Si 0.12%, Ni 1.45%, Cr 0.23%, Mo0.81%, Ti 0.13%.

[0057] (2) Preparation before welding

[0058] The low-alloy ultra-high-strength steel with a thickness of 25mm is butt welded, and the joint is processed into an X-shaped groove with a blunt edge by a milling machine. The groove angle is 35° and the blunt e...

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Abstract

The invention discloses a welding joint of low-alloy and ultrahigh-strength steel. The welding joint is characterized in that the welding joint structure comprises acicular martensite and strip-shapedbainite, the volume percent of the acicular martensite is 70-80%, and the volume percent of the strip-shaped bainite is 20-30%. The invention further discloses a welding method forming the welding joint. Compared with the prior art, the complex-phase welding joint can meet the using requirements for high strength and high toughness of a welding joint piece of a low-alloy and ultrahigh-strength steel medium-thick plate, and meanwhile is easy to operate, high in welding efficiency and easy to apply and popularize.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a welded joint of low-alloy ultra-high-strength steel and a welding method. Background technique [0002] Ultra-high-strength steel usually refers to steel with room temperature tensile strength greater than 1200MPa and yield strength greater than 1000MPa. Low-alloy ultra-high-strength steel has the characteristics of low alloy element content (alloy content ≤ 5%), low price, and appropriate strength and toughness. It is used in aerospace, army equipment, and large-scale components of ships and oceans. Mn-Cr-Ni-Mo low-alloy ultra-high-strength steel is developed on the basis of quenched and tempered steel, and its carbon content is 0.23-0.33%. At present, this type of steel is mainly quenched + tempered after forging. The quenching and tempering temperature process is strictly controlled to obtain high-strength martensite and high-toughness bainite structure...

Claims

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Application Information

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IPC IPC(8): B23K26/24B23K26/348B23K26/40B23K26/60
CPCB23K26/24B23K26/40B23K26/348B23K26/60
Inventor 王大锋马冰马良超陈东高张迎迎郭庆虎戴宇张龙
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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