Special welding rod for pressure equipment and preparation method

A technology of pressure-bearing equipment and welding methods, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of insufficient tensile strength, inability to meet requirements, poor welding seam forming, etc., to reduce porosity sensitivity, reduce Welding defects, the effect of improving arc stiffness

Active Publication Date: 2020-11-13
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional electrodes cannot meet the requirements, and it is of great strategic significance to develop low-temperature, high-toughness, ultra-low hydrogen electrodes that are matched with domestic 07MnNiMoDR-50℃ steel spherical tanks
[0003] At present, China's published patents, such as CN104400246A discloses a welding rod for -50°C ultra-low temperature pressure vessel steel, although it meets the impact of -50°C ≥ 80J, but the tensile strength is less than 620MPa; although the welding rod disclosed in CN106624467A can It meets the requirements of tensile strength, but it does not meet the requirements of -50°C impact ≥ 80J
Moreover, the electrodes in these two patents are used for 07MnNiMoDR-50°C steel spherical tanks. In addition to the tensile strength of less than 620MPa and the inability to meet the -50°C impact ≥ 80J during welding, there are also inconveniences in operation, unstable arc, and weld seams. Disadvantages such as poor molding and difficult slag removal

Method used

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  • Special welding rod for pressure equipment and preparation method
  • Special welding rod for pressure equipment and preparation method
  • Special welding rod for pressure equipment and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The invention is a low-temperature high-toughness welding rod for pressure-bearing equipment. The content of impurity elements in the deposited metal needs to be strictly controlled, and the alkaline slag system is used to ensure that the deposited metal has good mechanical properties.

[0029] Take the coating, and the components and parts by mass of the coating are as follows:

[0030] 8.5Kg marble, 5.25Kg fluorite, 3.5Kg rutile, 1Kg silica powder, 1.6Kg manganese metal, 0.85Kg ferrosilicon, 1.25Kg nickel powder, 0.1Kg ferromolybdenum, 0.1Kg sodium alginate, 0.2Kg soda ash, 0.1Kg CMC , graphite 0.025Kg, magnesium powder 0.07Kg.

[0031] Mix the components of the above drug skin evenly, add potassium sodium water glass with a modulus of 3.1, which accounts for 21.3% of the total mass of the drug powder, and have a Baume concentration of 41.3°Be'~41.7°Be', and stir for 10~15min. Send it to the hydraulic welding rod production equipment and wrap it on the welding core. ...

Embodiment 2

[0041] This embodiment is all the same as Example 1 except that the weights of the ingredients in the drug skin are different.

[0042] Take the coating, and the components and parts by mass of the coating are as follows:

[0043] 9.5Kg marble, 6.5Kg fluorite, 3.5Kg rutile, 2Kg silica powder, 1.65Kg manganese metal, 0.95Kg ferrosilicon, 1.35Kg nickel powder, 0.1Kg ferromolybdenum, 0.15Kg sodium alginate, 0.15Kg soda ash, 0.15Kg CMC , graphite 0.035Kg, magnesium powder 0.07Kg.

[0044] Mix the components of the above drug skin evenly, add potassium sodium water glass with a modulus of 3.1, which accounts for 21.3% of the total mass of the drug powder, and have a Baume concentration of 41.3°Be'~41.7°Be', and stir for 10~15min. Send it to the hydraulic welding rod production equipment and wrap it on the welding core. Then bake at a low temperature of 85° C. for 3.5 to 4 hours and at a high temperature of 380° C. for 1.5 hours to obtain the electrode.

[0045] In this embodiment,...

Embodiment 3

[0054] This embodiment is all the same as Example 1 except that the weights of the ingredients in the drug skin are different.

[0055] Take the coating, and the components and parts by mass of the coating are as follows:

[0056] 9Kg marble, 5.5Kg fluorite, 4Kg rutile, 1.5Kg silicon powder, 1.7Kg manganese metal, 0.9Kg ferrosilicon, 1.5Kg nickel powder, 0.2Kg ferromolybdenum, 0.15Kg sodium alginate, 0.15Kg soda ash, 0.1Kg CMC, Graphite 0.025Kg, magnesium powder 0.08Kg.

[0057] Mix the components of the above drug skin evenly, add potassium sodium water glass with a modulus of 3.1, which accounts for 21.3% of the total mass of the drug powder, and have a Baume concentration of 41.3°Be'~41.7°Be', and stir for 10~15min. Send it to the hydraulic welding rod production equipment and wrap it on the welding core. Then bake at a low temperature of 85° C. for 3.5 to 4 hours and at a high temperature of 380° C. for 1.5 hours to obtain the electrode.

[0058] In this embodiment, 60K...

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Abstract

The invention discloses a welding rod special for pressure bearing equipment and a preparation method. The pressure bearing equipment is prepared from 07MnNiMoDR-50 DEG C steel and composed of a welding core and a coating wrapping the surface of the welding rod, and the coating is composed of, by weight, 8.5-9.5 parts of diamond, 5.25-6.55 parts of fluorite, 3.5-4.75 parts of rutile, 1-2 parts ofsilica powder, 1.6-1.75 parts of metal manganese, 0.85-1.05 parts of ferrosilicon, 1.25-1.55 parts of nickel powder, 0.1-0.25 part of ferromolybdenum, 0.1-0.15 part of sodium alginate, 0.15-0.2 part of sodium carbonate, 0.1-0.15 part of CMC, 0.025-0.04 of graphite and 0.07-0.15 part of magnesium powder. Compared with the prior art, the welding rod has the advantages of excellent operation performance during welding, electric arc stability, beautiful welding joint appearance and easiness in deslagging.

Description

technical field [0001] The invention relates to the technology in the field of welding materials, in particular to a special welding rod for pressure-bearing equipment, a preparation method and a welding method. Background technique [0002] With the rapid development of my country's petroleum, chemical industry and steel material industry, especially the technological progress of spherical tank construction technology, the construction of spherical vessels presents a trend of high pressure and large-scale development. The 07MnNiMoDR-50°C steel used in the construction of large vinyl spherical tanks has been gradually localized. Because of its characteristics different from low-temperature pressure vessels, it needs to be assembled, welded and post-weld overall heat treatment on site under harsh construction conditions. In addition to ensuring sufficient strength In addition to grades, the deposited metal also needs to have excellent low temperature impact toughness and crac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40
Inventor 刘杰刘奇望黄义芳蒋勇明廷泽
Owner ATLANTIC CHINA WELDING CONSUMABLES
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