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Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station

A pressure steel pipe and welding method technology, which is applied in the field of steel pipe welding and high-strength steel welding, can solve the problems of low welding efficiency, achieve the effects of improving production efficiency, reducing the tendency of cold cracks, and avoiding the deterioration of mechanical properties

Inactive Publication Date: 2011-06-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength steel welding method for 610MPa hydroelectric power steel pipes, which solves the problems of low welding efficiency due to the need for preheating before welding and stress relief heat treatment after welding for 610MPa hydropower steel pipes.

Method used

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  • Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station
  • Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station
  • Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station

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Effect test

Embodiment 1

[0018] (1) Low-alloy high-strength steel plates for hydroelectric pressure steel pipes with yield tensile strength ≥ 610 MPa and -20 °C impact energy ≥ 47J produced by TMCP + tempering process, the thickness combination is 38mm + 38mm, and the test plate size is 600mm × 220mm × 38mm ;

[0019] Matching welding materials are:

[0020] Welding material: The chemical composition of its main elements is C 0.061%, Mn 1.68%, Si 0.15%, Mo 0.52%, Cu 0.13%, S 0.007%, P≤0.015%.

[0021] The welding wire is Ф4.0mm directly, and it is welded with SJ101 flux. The mechanical properties of the cladding metal are: tensile strength 690MPa, yield strength 615MPa, elongation 27%, impact energy 100J at -20°C;

[0022] (2) Double-sided asymmetrical X-shaped grooves are opened at the joint. The large groove surface is 2 / 3 of the plate thickness, the small groove surface is 1 / 3 of the plate thickness and the groove angle is 60°C, leaving a 3mm wide blunt edge;

[0023] (3) During welding, submerge...

Embodiment 2

[0027] (1) Low-alloy high-strength steel plates for hydroelectric pressure steel pipes with yield tensile strength ≥ 610MPa and -20°C impact power ≥ 47J produced by TMCP + tempering process, the thickness combination is 55mm + 55mm, and the test plate size is 600mm × 220mm × 55mm ;

[0028] Matching welding materials are:

[0029] Welding material: The chemical composition of its main elements is C 0.061%, Mn 1.68%, Si 0.15%, Mo 0.52%, Cu 0.13%, S 0.007%, P≤0.015%.

[0030] The welding wire is Ф4.0mm directly, and it is welded with SJ101 flux. The mechanical properties of the cladding metal are: tensile strength 690MPa, yield strength 615MPa, elongation 27%, impact energy 100J at -20°C;

[0031] (2) Double-sided asymmetrical X-shaped grooves are opened at the joint. The large groove surface is 2 / 3 of the plate thickness, the small groove surface is 1 / 3 of the plate thickness and the groove angle is 60°C, leaving a 3mm wide blunt edge;

[0032] (3) During welding, submerged a...

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Abstract

The invention relates to a welding method of high-strength steel for a pressure steel pipe of a 610MPa hydropower station, belonging to the technical field of steel pipe welding. In the method, a constant-strength low-hydrogen electric welding rod is used for priming, and a constant-strength matched welding rod is adopted to continuously weld and fill a weld pass by adopting a submerged-arc welding method, wherein the welding line energy is strictly controlled to be about 30-40kJ / cm, and the interpass temperature is controlled to be 100-150 DEG C; and after welding, an aluminum silicate plate is used for covering a welding joint for slow cooling so as to realize the welding of a steel plate for a steel pipe for a 610MPa hydropower station without preheating before welding and heat treatment after welding. The method solves the problems that the traditional steel for the pressure steel pipes of the 610MPa hydropower station needs to be preheated before welding and subjected to stress relief heat treatment after welding, and the welding efficiency is low.

Description

technical field [0001] The invention belongs to the technical field of steel pipe welding, and in particular provides a high-strength steel welding method for pressure steel pipes of 610MPa hydropower stations, a high-efficiency and low-cost submerged arc welding process, and particularly relates to a high-strength steel pipe for 610MPa hydropower station pressure pipes. The invention relates to a welding process method without preheating and post-weld heat treatment, belonging to the technical field of high-strength steel welding. Background technique [0002] In the construction of hydropower stations, with the development of high-parameter and large-capacity units, the size of penstocks in hydropower stations is becoming larger and larger. In order to meet the requirements of engineering applications and ensure the safety of penstocks, it is required to pre-weld steel plates. In order to eliminate the residual stress of the welded joint and improve the structure of the we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235
Inventor 张熹许良红陈延清章军张永强吴斌隋鹤龙董现春张飞虎鞠建斌张楠
Owner SHOUGANG CORPORATION
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