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Special welding rod for -70 DEG C ferrite type low-temperature steel

A low-temperature steel and shape technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of poor welding processability, unstable low-temperature toughness of deposited metal, and low impact toughness of welded joints. Stable, small spatter, and beautifully formed welds

Active Publication Date: 2012-07-04
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, low-temperature steel welding consumables in China generally have poor all-position welding processability, and the low-temperature toughness of deposited metal is unstable, especially the impact toughness of welded joints is low, which cannot meet the design requirements.

Method used

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  • Special welding rod for -70 DEG C ferrite type low-temperature steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, get 35 parts of marble; 29 parts of fluorite; 2 parts of titanium dioxide; 3 parts of quartz; 4 parts of mica; 6 parts of ferrosilicon; 2 parts of feldspar; 3 parts of iron sand, a total of 105kg of powder and mix evenly, add 26.50kg of potassium sodium water glass into the dry powder and mix evenly, apply it on the H08E low-alloy steel welding core with a hydraulic machine, and the electrode will naturally dry after 24 hours Allow to dry and then be dried. Its welding process performance is good, especially it has excellent all-position welding processability. The V-notch impact toughness test values ​​of its deposited metal and welded joints are shown in Table 2.

Embodiment 2

[0018] Example 2, get 38 parts of marble; 27 parts of fluorite; 1 part of titanium dioxide; 1 part of quartz; 3 parts of mica; 5 parts of ferrosilicon; 9 parts of ferrosilicon; 4 parts of feldspar; 4 parts of iron sand, a total of 104kg of powder and mix evenly, add 26.00kg of potassium sodium water glass into the dry powder and mix evenly, apply it on the H08E low alloy steel welding core with a hydraulic machine, and the electrode will naturally dry after 24 hours Allow to dry and then be dried. Its welding process performance is good, especially it has excellent all-position welding processability. The V-notch impact toughness test values ​​of its deposited metal and welded joints are shown in Table 2.

Embodiment 3

[0019] Embodiment 3, get 36 parts of marble; 28 parts of fluorite; 3 parts of titanium dioxide; 2 parts of quartz; 5 parts of mica; 4 parts of ferrosilicon; 3 parts of feldspar; 5 parts of iron sand, a total of 105kg of powder and mix evenly, add 26.50kg of potassium sodium water glass into the dry powder and mix evenly, press-coat it on the H08E low-alloy steel welding core with a hydraulic machine, and the electrode will naturally dry after 24 hours Allow to dry and then be dried. Its welding process performance is good, especially it has excellent all-position welding processability. The V-notch impact toughness test values ​​of the deposited metal and welded joints are shown in Table 2.

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Abstract

The invention discloses a special welding rod for -70 DEG C ferrite type low-temperature steel. The special welding rod is characterized in that the special welding rod is prepared by the following steps of: mixing the following powdery raw materials in part by weight: 35 to 38 parts of marble, 27 to 29 parts of fluorite, 1 to 3 parts of titanium white powder, 1 to 3 parts of quartz, 3 to 5 partsof mica, 4 to 6 parts of ferrosilicon, 7 to 9 parts of ferrotitanium, 3 to 5 parts of electrolytic manganese, 6 to 8 parts of nickel metal powder, 1 to 3 parts of sodium carbonate, 2 to 4 parts of feldspar and 3 to 5 parts of iron sand; adding potassium sodium water glass in an amount which is 25 percent of the total weight of the powdery raw materials; stirring the mixture uniformly; and press-coating the mixture on a carbon steel core wire to form a low-allow steel welding rod. A weld metal and a weld joint of the welding rod have excellent and stable -70 DEG C low-temperature impact property, the mean value of -70 DEG C V-shaped notch impact power of the weld metal is 160J, and the mean value of 70 DEG C V-shaped notch impact power of the weld joint is 110J, thus fully meeting the engineering requirement.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a low-alloy steel welding rod suitable for -70°C low-temperature steel. Background technique [0002] With the rapid development of my country's industry, equipment and storage tanks used in low temperature environments are gradually increasing, such as methanol scrubbers, liquid chlorine, and liquefied petroleum gas storage tanks in coal chemical industry. Such equipment mostly uses 09MnNiDR (ferrite type) Low-temperature steel) steel plate welding requires a large amount of special welding consumables for -70°C low-temperature steel. At present, low-temperature steel welding consumables in China generally have poor all-position welding processability, unstable low-temperature toughness of deposited metal, especially low impact toughness of welded joints, which cannot meet the design requirements. Therefore, a large number of imported low-temperature steel welding consumables ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/365
Inventor 边境李伟陈波王学东王士山李柱
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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