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Low-hydrogen high crack prevention welding rod

A welding rod and anti-crack technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problem of few reports on low-temperature spherical tank anti-crack electrodes, and achieve the effect of excellent crack arrest performance

Inactive Publication Date: 2018-08-14
张宇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Few reports on arresting electrodes for cryogenic spherical tanks

Method used

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  • Low-hydrogen high crack prevention welding rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0039] Steel plate thickness is 5mm, single V-shaped 40° groove, heat input 20kJ / cm, flat welding.

[0040] The electrode specification is 4.0mm, and the composition is shown in Table 1.

[0041] Welding process performance, weld diffusible hydrogen content and crack arrest performance are shown in Table 2-3 respectively.

Embodiment 3-4

[0043] The thickness of the steel plate is 10mm, the single V-shaped 35° groove, the heat input is 25kJ / cm, and it is welded vertically.

[0044] The electrode specification is 4.0mm, and the composition is shown in Table 1.

[0045] Welding process performance, weld diffusible hydrogen content and crack arrest performance are shown in Table 2-3 respectively.

Embodiment 5-6

[0047] The thickness of the steel plate is 10mm, the single V-shaped 40° groove, the heat input is 15kJ / cm, and it is welded vertically downward.

[0048] The electrode specification is 4.0mm, and the composition is shown in Table 1.

[0049] Welding process performance, weld diffusible hydrogen content and crack arrest performance are shown in Table 2-3 respectively.

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Abstract

The invention discloses a low-hydrogen high crack prevention welding rod. The low-hydrogen high crack prevention welding rod comprises, by total weight, 40-55% of marble, 10-20% of fluoride, 0.5-4% ofSiO2, 6-15% of TiO2, 0.1-2% of Al2O3, 2-7% of a nickel-magnesium alloy, 0.8-2.8% of Mn, 1-4% of Ni, 0.1-0.5% of B, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of N, 2-5% of sodium or potassium oxide, and a proper amount of an adhesion agent and inevitable impurities. The low-hydrogen high crack prevention welding rod can be applied to full-position welding of low temperature spherical tanks and the like.

Description

technical field [0001] The invention relates to a low-hydrogen high-crack-arresting electrode, in particular to an electric electrode for low-temperature steel with low diffusible hydrogen content and excellent crack-arresting performance. Background technique [0002] Spherical tanks for ethylene, liquefied petroleum gas, and liquefied natural gas often lead to welding cold cracks due to the complex structure of the tank body, high construction constraints, and the need for field construction. The content of diffusible hydrogen in welding directly determines the sensitivity to cold cracks, so the welding material needs to have the characteristics of low diffusible hydrogen. In addition, since the base metal itself has excellent low-temperature toughness, the welding consumables and weld metal also need to have excellent low-temperature toughness. [0003] Recently, in order to further ensure the safety performance of structures, the requirements for crack arrest performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/365
CPCB23K35/365
Inventor 张宇
Owner 张宇
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