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Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode

A hydrogen-induced crack resistance, high toughness technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as equipment damage and explosion, and achieve stable arc, easy slag removal, and excellent welding performance. Effect

Inactive Publication Date: 2012-07-04
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current steelmaking technology can already make the equipment matrix have a high resistance to hydrogen-induced cracking, but the welded joint is often a sensitive part, and the hydrogen atoms generated by hydrogen sulfide are easy to gather at the welding defect. As the pressure increases, Cracks often occur at the weld bead, resulting in the destruction of the entire equipment and explosion accidents

Method used

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  • Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode
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  • Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Adopt the general manufacturing process in the welding rod production industry, make the welding core according to the welding core formula in Table 1-1, prepare the welding rod coating according to the coating formula in Table 1-2 and prepare the welding rod coating by dry mixing and wet mixing, and apply the welding rod coating onto the core to form it:

[0050] Table 1-1 Solder core formula (unit: weight percentage)

[0051] C

Si

mn

Cr

Ni

P

S

Fe

0.06

0.03

0.45

0.04

0.04

0.006

0.003

margin

[0052] Table 1-2 drug skin formula (unit: weight percentage)

[0053]

[0054] The chemical composition of the deposited metal is shown in Table 1-3, the mechanical properties are shown in Table 1-4, the results of the diffusible hydrogen test are shown in Table 1-5, and the results of the corrosion test (HIC) are shown in Table 1-6:

[0055] Table 1-3 Chemical composition of ...

Embodiment 2

[0067] Adopt the general manufacturing process in the welding rod production industry, make the welding core according to the welding core formula in Table 2-1, prepare the welding rod coating according to the coating formula in Table 2-2 and prepare the welding rod coating by dry mixing and wet mixing, and apply the welding rod coating onto the core to form it:

[0068] Table 2-1 Solder core formula (unit: weight percentage)

[0069] C

Si

mn

Cr

Ni

P

S

Fe

0.03

0.03

0.35

0.04

0.03

0.005

0.004

margin

[0070] Table 2-2 Drug skin formula (unit: weight percentage)

[0071]

[0072] The chemical composition of the deposited metal is shown in Table 2-3, the mechanical properties are shown in Table 2-4, the content of diffusible hydrogen is shown in Table 2-5, and the HIC corrosion test results are shown in Table 2-6:

[0073] Table 2-3 Chemical composition of deposited metal (we...

Embodiment 3

[0082] Adopt the general manufacturing process in the welding rod production industry, make the welding core according to the welding core formula in Table 3-1, prepare the welding rod coating according to the coating formula in Table 3-2 and prepare the welding rod coating by dry mixing and wet mixing, and apply the welding rod coating onto the core to form it:

[0083] Table 3-1 Solder core formula (unit: weight percentage)

[0084] C

Si

mn

Cr

Ni

P

S

Fe

0.01

0.05

0.30

0.012

0.20

0.005

0.001

margin

[0085] Table 3-2 Drug skin formula (unit: weight percentage)

[0086]

[0087] The chemical composition of the deposited metal is shown in Table 3-3, the mechanical properties are shown in Table 3-4, the content of diffusible hydrogen is shown in Table 3-5, and the HIC corrosion test results are shown in Table 3-6:

[0088] Table: 3-3 Chemical composition of deposited metal (...

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Abstract

The invention discloses a hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode which consists of a core welding wire and a coating, wherein the coating is coated on the outer wall of the core welding wire, the weight coefficient of the coating accounting for the total weight of the welding electrode is 0.4-0.5, the core welding wire comprises the following constituents in percentage by weight: 0.01-0.08% of C, 0.01-0.05% of Si, 0.30-0.55% of Mn, 0.005-0.20% of Cr, 0.005-0.20% of Ni, 0.001-0.006% of P, 0.001-0.005% of S and the balance of Fe; the coating adopts a basic slag system which comprises the following constituents: 30-50% of calcium carbonate, 1-2% of sodium carbonate, 15-30% of calcium fluoride, 3-8% of rutile, 1-5% of titanium pigment, 2-10% of silicon dioxide, 5-10% of electrolytic manganese, 2-5% of ferrosilicon and 0.1-1.5% of ferromolybdenum. When the welding electrode is adopted to weld, the tensile strength of a welding line is more than 500MPa, the striking energy is more than 170J at minus 30 DEG C, the content of diffusible hydrogen is between 2-3ml / 100g and the crack sensitivity is less than 0.11, and the hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode is used for welding of essential equipment in petrochemical industry and the like.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a hydrogen-induced crack-resistant high-toughness ultra-low-hydrogen steel welding electrode, which is a low-alloy high-strength steel welding electrode suitable for welding petrochemical equipment. Background technique [0002] Damage to production or delivery equipment due to wet hydrogen sulfide has occurred frequently since the dawn of the oil refining industry. The current steelmaking technology can already make the equipment matrix have a high resistance to hydrogen-induced cracking, but the welded joint is often a sensitive part, and the hydrogen atoms generated by hydrogen sulfide are easy to gather at the welding defect. As the pressure increases, Cracks often occur at the weld bead, causing the entire equipment to be destroyed and an explosion accident to occur. Contents of the invention [0003] In order to overcome the above defects, the present invention provides ...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K35/30B23K35/365
Inventor 蔡鸿祥陈国栋王登峰
Owner KUSN GINTUNE WELDING
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