Welding process of ultrahigh-strength steel and heterogeneous high-strength steel

An ultra-high-strength steel, welding technology, applied in welding media, welding equipment, welding equipment and other directions, can solve the problems of low welding efficiency, different physical properties, high cost, improve production efficiency, high degree of automation, simple operation. Effect

Inactive Publication Date: 2011-01-26
PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD
View PDF3 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the offshore platform is under harsh environmental conditions such as low temperature and sea waves, cracks are prone to occur at the joints, and crack propagation can lead to structural instability and fracture
At present, the welding of ultra-high-strength steel and dissimilar high-strength steel materials is increasingly used in the offshore construction industry. Due to the differences in chemical composition, metallographic structure, physical properties and mechanical properties of dissimilar metals, especially in dissimilar metal joints There is a transition zone between the welding seam and the fusion zone, where not only the chemical composition and metallographic structure are not uniform, but also the physical properties are different, and the mechan

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Welding process of ultrahigh-strength steel and heterogeneous high-strength steel
  • Welding process of ultrahigh-strength steel and heterogeneous high-strength steel
  • Welding process of ultrahigh-strength steel and heterogeneous high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] The welding process of ultra-high-strength steel and dissimilar high-strength steel includes the following steps:

[0029] 1. Material selection:

[0030] 1) Ultra-high-strength steel work piece 1 is made of Tenaris S690 steel pipe with a wall thickness of 15.9 mm and a pipe diameter of Ф457.2mm. This material has the advantages of high strength and good toughness, but the weld is prone to softening and embrittlement of the heat-affected zone , Welding cold cracks and other issues, this type of steel has a wide range of applications in important structures in marine engineering, shipbuilding and other industries.

[0031] 2) The material of dissimilar high-strength steel workpiece 2 is 15CrNiMoV, which is a forged steel with a thickness of 140 mm.

[0032] 2. The welding process is as follows: before welding, dry the welding material at 360℃-410℃ for 2 hours, such as figure 1 , 2 As shown, firstly set the V-shaped groove on the end face of the ultra-high-stre...

Example Embodiment

[0038] Example 2

[0039] A welding process of ultra-high-strength steel and dissimilar high-strength steel includes the following steps:

[0040] 1. Material selection:

[0041] 1) Ultra-high-strength steel workpiece 1 is made of 30CrMnSiNi2A, with a wall thickness of 16.5mm and a pipe diameter of Ф460.5mm.

[0042] 2) The selected material of the dissimilar high-strength steel workpiece 2 is 35CrMoV, which is a forged steel with a thickness of 100mm, and the length and width of the tested material are both 600mm.

[0043] 2. The welding process is as follows: Before welding, dry the welding material at 360℃-410℃ for 2 hours, such as figure 1 The welding position is shown. First, the end face of the ultra-high-strength steel is set with a V-shaped groove with an angle of 40°; then, the MIG welding is used, and the Lincoln STT technology is used for bottoming. The welding requires single-sided welding and double-sided forming, bottoming Use AWS A5.28 ER80S-G (Φ1.0mm) solid welding wir...

Example Embodiment

[0048] Example 3

[0049] A welding process for ultra-high-strength steel and dissimilar high-strength steel includes the following steps:

[0050] 1. Material selection:

[0051] 1) Ultra-high-strength steel work piece 1 is made of S460NH steel pipe with a wall thickness of 25.4 mm and a pipe diameter of Ф457.2 mm. This material has the advantages of high strength and good toughness, but the weld is prone to softening and embrittlement of the heat-affected zone. Welding cold cracks and other issues, this type of steel has a wide range of applications in important structures in marine engineering, shipbuilding and other industries.

[0052] 2) The selected material of dissimilar high-strength steel workpiece 2 is 15CrNiMoV, which is a forged steel with a thickness of 140 mm.

[0053] 2. The welding process is as follows: Before welding, dry the welding material at 360℃-410℃ for 2 hours, such as figure 1 The welding position is shown. First, set the V-shaped groove on the end face of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Wall thicknessaaaaaaaaaa
Diameteraaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to a welding process of ultrahigh-strength steel and heterogeneous high-strength steel, belonging to the field of welding and processing. For solving problems, the invention provides a welding process of ultrahigh-strength steel and heterogeneous high-strength steel to ensure that welded joints have favorable formation and no welding defects and the mechanical properties can meet the requirement on the product. The welding process comprises the following steps of: (1) groove form: setting the groove angle on the end surface of the ultrahigh-strength steel to 37 DEG-45 DEG, setting the end face of a heterogeneous high-strength steel forging to a vertical plane, and adopting appropriate root gaps and truncated edges; (2) selection of a welding method and a welding material: bottoming by adopting melting pole mixed gas metal arc welding (GMAW) with a Lincoln STT (Short Time Test) technology, wherein the welding requires single-face welding and double-face formation, welding wires adopt AWSA5.28ER80S-G, the protective gas is formed by mixing 80% of AR and 20% of CO2, and the gas flow is15-20 L/Min; and the filling and the cover face, wherein low-hydrogen shielded metal arc welding (SMAW) is adopted, and AWSA5.5E11018M is selected as a welding rod. The welding process is used for welding and processing the ultrahigh-strength steel and the heterogeneous high-strength steel.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding process between ultra-high-strength steel and dissimilar high-strength steel. Background technique [0002] Nowadays, offshore oil has accelerated the pace of development, and the world's oil industry is investing more and more in offshore oil and gas, especially the importance and strategic position of exploration and development in deep sea areas and cold sea areas has attracted more and more attention. Therefore, more stringent performance requirements are put forward for steel structures and equipment such as offshore oil and gas platforms, offshore cranes, and floating production and storage vessels. This has put forward higher requirements and more severe challenges for the welding of steel structures in the offshore construction industry, especially high-strength steel and ultra-high-strength steel. However, there is relatively little theoretical research and engineering pra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B23K9/00B23K9/23B23K9/173B23K9/095B23K9/235B23K33/00B23K35/00
Inventor 程尚华宋顺樊铭林高卫东贾晓燕王新昌
Owner PENGLAI JUTAL OFFSHORE ENG HEAVY IND CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap