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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
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 mechanical properties are also very different. Welding defects are prone to appear during the welding process, which seriously reduces the joint performance.
At the same time, the weldability of ultra-high-strength steel is poor, the hardening tendency is large, and there is a large tendency of cold cracking, which has become a safety hazard for the entire steel structure.
For the single-sided welding and double-sided forming of ultra-high-strength steel, the commonly used bottom welding method generally adopts argon tungsten arc welding (GTAW), which has high requirements for welding technology and requires two-handed operation, which brings safety hazards to on-site high-altitude operations. Therefore, on-site welding is difficult, the welding efficiency is low, and the cost is high

Method used

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  • 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
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Effect test

Embodiment 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 workpiece 1 is made of Tenaris S690 steel pipe with a wall thickness of 15.9 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 in the heat-affected zone , Welding cold cracks and other problems, this type of steel is widely used 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 kind of forged steel with a plate thickness of 140 mm.

[0032] 2. The welding process is as follows: before welding, dry the welding material at 360°C-410°C for 2 hours, if figure 1 , 2 As shown, first set a V-shaped groove on the end face of the ultra-high-strength steel workp...

Embodiment 2

[0039] A welding process for ultra-high-strength steel and dissimilar high-strength steel, comprising 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 material of dissimilar high-strength steel workpiece 2 is 35CrMoV, which is a kind of forged steel with a plate thickness of 100mm. The length and width of the test material taken are both 600mm.

[0043] 2. The welding process is as follows: before welding, dry the welding material at 360°C-410°C for 2 hours, if figure 1 The welding position is shown. Firstly, the end face of the ultra-high-strength steel is set with a V-shaped groove at an angle of 40°; then, the molten electrode mixed gas shielded welding is used, and the Lincoln STT technology is used to make the bottom. Welding requires one-sided welding and double-sided forming. AWS A5.28 ER80S-G (Φ1.0mm) solid w...

Embodiment 3

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

[0050] 1. Material selection:

[0051] 1) Ultra-high-strength steel workpiece 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 in the heat-affected zone. Welding cold cracks and other problems, this type of steel has a wide range of applications in important structures in marine engineering, shipbuilding and other industries.

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

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

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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

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Application Information

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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
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