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Submerged arc welding method of ultralow carbon stainless steel thick plate

A stainless steel and ultra-low carbon technology, applied in arc welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of large deformation, low impact toughness at room temperature, large input heat, etc., and achieve the effect of avoiding fatal defects and high performance indicators

Active Publication Date: 2015-07-22
重庆天齐锂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing welding technology, the welding process for welding metallurgical pressure vessels, evaporator shells, low-alloy high-strength steel and stainless steel with a thickness of less than 20mm is relatively mature, but the existing welding process has a large input heat , large deformation, wide heat-affected zone, and low impact toughness at room temperature under the same heat treatment conditions. For equipment requiring high toughness and low brittleness, the existing technology cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0020] In the submerged arc welding method of the ultra-low carbon stainless steel thick plate of the present embodiment, the material of the stainless steel thick plate is 00Cr18Ni10, the thickness of the stainless steel thick plate is 20mm, adopt double-sided welding, and the line energy can be selected for use 260-280 KJ / dm, The interlayer temperature can be chosen to be 1200-1450°C, the line energy of this embodiment is chosen to be 270 KJ / dm, and the interlayer temperature is 1400°C.

[0021] The submerged arc welding method of the ultra-low carbon stainless steel thick plate in this embodiment can maintain sufficient melting in the molten pool by using a large input energy of 260-280 KJ / dm and an interlayer temperature of 1200-1450 ° C, effectively avoiding welding of thick stainless steel plates The fatal defect of micro-crack defects, thus obtaining the weld seam with high performance index, fundamentally broke the process principle of not allowing preheating and requir...

no. 2 example

[0023] In the submerged arc welding method of the ultra-low carbon stainless steel thick plate of the present embodiment, the material of the stainless steel thick plate is 00Cr17Ni14Mo2, the thickness of the stainless steel thick plate is 15mm, adopts double-sided welding, and the line energy can be selected for use 220-250 KJ / dm, The interlayer temperature can be chosen to be 1200-1400°C, the line energy of this embodiment is chosen to be 250 KJ / dm, and the interlayer temperature is 1400°C.

[0024] The submerged arc welding method of the ultra-low carbon stainless steel thick plate in this embodiment can maintain sufficient melting in the molten pool by using a large input energy of 220-250 KJ / dm and an interlayer temperature of 1200-1400 ° C, effectively avoiding welding of thick stainless steel plates The fatal defect of micro-crack defects, thus obtaining the weld seam with high performance index, fundamentally broke the process principle of not allowing preheating and re...

no. 3 example

[0026] In the submerged arc welding method of the ultra-low carbon stainless steel thick plate of the present embodiment, the material of the stainless steel thick plate is 00Cr18Ni10, the thickness of the stainless steel thick plate is 10mm, adopts single-sided welding, and the line energy can be selected for use 150-180 KJ / dm, The interlayer temperature can be selected as 1200-1300°C, the line energy of this embodiment is selected as 180, and the interlayer temperature is 1300°C.

[0027] The submerged arc welding method of the ultra-low carbon stainless steel thick plate in this embodiment adopts a large input energy of 150-180 KJ / dm and an interlayer temperature of 1200-1300°C, which can maintain sufficient melting in the molten pool and effectively avoid welding of thick stainless steel plates The fatal defect of micro-crack defects, thus obtaining the weld seam with high performance index, fundamentally broke the process principle of not allowing preheating and requiring ...

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Abstract

The invention discloses a submerged arc welding method of an ultralow carbon stainless steel thick plate. Large linear energy and higher interlayer temperature are adopted; the linear energy is 20-380A; and the interlayer temperature is 1200-1500 DEG C. According to the submerged arc welding method of the ultralow carbon stainless steel thick plate, by adopting the large linear energy and the higher interlayer temperature, thorough melting can be maintained in a melting bath; and the occurrence of the critical defect-micro crack defect in the process of welding of the stainless steel thick plate is avoided, thus obtaining a high-performance-index weld. The technological principle that preheating is not allowed and low linear energy is required to be adopted, which is followed in the process of welding stainless steel, is broken fundamentally; and the indexes of the obtained weld, such as chemical components, mechanical performance, weld inherent defects, resistance to intergranular corrosion and the like, meet technical requirements.

Description

technical field [0001] The invention belongs to the technical field of welding technology, in particular to a submerged arc welding method for ultra-low carbon stainless steel thick plates. Background technique [0002] In the existing welding technology, the welding process of welding metallurgical pressure vessels, evaporator shells, low-alloy high-strength steel and stainless steel with a thickness of less than 20mm is relatively mature, but the existing welding process has a large input heat , large deformation, wide heat-affected zone, and low impact toughness at room temperature under the same heat treatment conditions. For equipment requiring high toughness and low embrittlement, the existing technology cannot meet the requirements. In the welding technology of stainless steel, it is more complicated and difficult to solve the problem of cracks, especially for ultra-low carbon stainless steel thick plates, the requirements for welding technology are higher. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18
Inventor 何卫东
Owner 重庆天齐锂业有限责任公司