Welding method of ultra-thick and high-strength water-power steel

A welding method and high-strength technology, applied in the direction of welding equipment, arc welding equipment, workpiece edge, etc., can solve the problems of low welding efficiency, slag knocking, grinding, cold crack joints, etc., to ensure welding quality, reduce filling amount, The effect of a large margin

Active Publication Date: 2010-12-08
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the on-site welding of high-strength hydropower steel with a thickness of 610 MPa adopts the method of manual arc welding, the welding efficiency is low, slag knocking and grinding are required between weld passes, and unfused and cold cracks are prone to occur during the welding process and joint embrittlement

Method used

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  • Welding method of ultra-thick and high-strength water-power steel
  • Welding method of ultra-thick and high-strength water-power steel
  • Welding method of ultra-thick and high-strength water-power steel

Examples

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Effect test

Embodiment example 1

[0022] Base material: 150mm thick 610MPa grade 07MnCrMoVR high-strength hydropower steel, tensile strength 670MPa, quenched and tempered state, welded steel plate combination 150mm+150mm. The size of the test plate is 600mm×230mm×150mm, and the welding groove adopts an asymmetric U-shaped groove, and the groove size is shown in the figure.

[0023] Welding materials: manual welding rod diameter is The mechanical properties of deposited metal are ReL: 540MPa, Rm: 660MPa, A: 22%, -20℃ AKV impact energy is 150J; gas shielded welding wire diameter is The mechanical properties of the deposited metal are ReL: 540MPa, Rm: 660MPa, A: 22%, and the impact energy of AKV at -20°C is 150J.

[0024] Welding process: 150mm thick steel plate is welded by mixed welding process, and the bottom area is welded by manual arc welding process. The process parameters are: welding current 160A, welding voltage 27V, welding speed 10cm / min, welding line energy 25.9kJ / cm; The area and the surface are...

Embodiment example 2

[0027] Base material: 150mm thick 610MPa grade 07MnCrMoVR high-strength hydropower steel, tensile strength 690MPa, quenched and tempered state, welded steel plate combination 150mm+150mm. The size of the test plate is 600mm×230mm×150mm, and the welding groove adopts an asymmetric U-shaped groove, and the groove size is shown in the figure.

[0028] Welding materials: manual welding rod diameter is The mechanical properties of deposited metal are ReL: 540MPa, Rm: 660MPa, A: 22%, -20℃ AKV impact energy is 150J; gas shielded welding wire diameter is The mechanical properties of the deposited metal are ReL: 540MPa, Rm: 660MPa, A: 22%, and the impact energy of AKV at -20°C is 150J.

[0029] Welding process: 150mm thick steel plate is welded by mixed welding process, and the bottom area is welded by manual arc welding process. The process parameters are: welding current 170A, welding voltage 26V, welding speed 10cm / min, welding line energy 26.5kJ / cm; The area and the surface are...

Embodiment example 3

[0032] Base material: 150mm thick 610MPa grade 07MnCrMoVR high-strength hydropower steel, tensile strength 680MPa, quenched and tempered state, welded steel plate combination 150mm+150mm. The size of the test plate is 600mm×230mm×150mm, and the welding groove adopts an asymmetric U-shaped groove. See the groove size figure 1 shown.

[0033]Welding materials: manual welding rod diameter is The mechanical properties of deposited metal are ReL: 540MPa, Rm: 660MPa, A: 22%, -20℃ AKV impact energy is 150J; gas shielded welding wire diameter is The mechanical properties of the deposited metal are ReL: 540MPa, Rm: 660MPa, A: 22%, and the impact energy of AKV at -20°C is 150J.

[0034] Welding process: 150mm thick steel plate is welded by mixed welding process, and the bottom area is welded by manual arc welding process. The process parameters are: welding current 160A, welding voltage 28V, welding speed 11cm / min, welding line energy 24.4kJ / cm; The area and the surface area are we...

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Abstract

The invention relates to a welding method of ultra-thick and high-strength water-power steel, belonging to the welding field. Welding is realized by adopting a mixed welding mode, i.e. hand welding is adopted as a basis for filling the bottom, and gas shielded welding is adopted for a middle layer and a cover part, multilayer and multi-pass welding are adopted, a carbon arc is cropped out after a single side is filled, and the input of welding heat is controlled within 65 kJ / cm. A welding bevel adopts an asymmetric U-shaped bevel, a thick steel plate of 145-155 mm is preheated to 100 DEG C before welding, the inter-layer temperature is kept between 100 DEG C to 160 DEG C, and heat treatment stress is not carried out after welding, and the problem of reheat embrittlement of a welding joint of the high-strength water-power steel is solved. The invention needs simple welding equipment, realizes welding through a combined welding process on the basis of the traditional equipment, reduces the filling amount of welding metal, and achieves the welding effect of a narrow gap. Compared with the hand arc welding, the invention greatly improves the welding efficiency of the thick steel plate and lowers the possibility of welding defects easily generated on the hand arc welding of an ultra-thick steel plate, such as cold cracks, incomplete fusion, crisp fusion, and the like.

Description

technical field [0001] The invention belongs to the field of welding, and relates to a welding method for super-thick high-strength hydropower steel, which is not only suitable for welding super-thick high-strength hydropower steel, but also suitable for welding other super-thick low-alloy steels. Background technique [0002] As the water head of domestic hydropower stations increases and the installed capacity of a single unit increases, the steel used for hydropower gradually develops in the direction of high strength and large thickness. In order to meet the needs of my country's hydropower project construction, Shougang has successfully developed a hydropower steel with an ultra-thickness of 610MPa, with a thickness specification of 150mm, and its comprehensive mechanical properties have also reached those of similar foreign products, filling the domestic gap. However, there is no domestic report on the welding of such ultra-thick high-strength hydropower steel plates, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235B23K9/23B23K9/095B23K9/16B23K33/00
Inventor 许良红陈延清章军曾宇波王剑齐建郭占山张熹王威肖可畏
Owner SHOUGANG CORPORATION
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