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Waterproof and moistureproof covered electrode coating suitable for underwater wet welding and spraying method thereof

A wet welding and welding rod technology, applied in the coating, the device for coating liquid on the surface, the pretreatment surface, etc., to achieve uniform properties, solve the problem of moisture absorption, and have obvious effects of waterproofing and moisture-proofing.

Inactive Publication Date: 2018-04-10
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a waterproof and moisture-proof electrode coating suitable for underwater wet welding and its spraying method. The powder electrostatic spraying method is used to spray the protective coating on the surface of the electrode coating, which can not only fundamentally Solve the problem of moisture absorption of the welding rod, and at the same time, it can also promote the underwater wet welding process

Method used

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  • Waterproof and moistureproof covered electrode coating suitable for underwater wet welding and spraying method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The outer layer of the electrode is covered with a coating, and one end of the electrode is not covered with a coating. A waterproof coating is sprayed on the coating by electrostatic spraying, including the following steps:

[0026] (1) Preparation of coating materials: The coating is proportioned according to the following parts by weight: 65 parts of epoxy powder, 15 parts of curing agent, 10 parts of rare earth oxide, and 10 parts of fluorite powder. Among them, the particle size of epoxy powder 80 μm, the curing agent is a mixture of T-31 curing agent and diethylenetriamine, and the powder is mixed evenly;

[0027] (2) Pretreatment of welding rods: firstly dry the welding rods at 220°C for two hours, and use the heat generated by the temperature during drying to absorb a large amount of epoxy powder and other coating powders, even if the surface of the welding rods has Unevenness or shrinkage cavity defects are also easily filled and covered by powder, which can en...

Embodiment 2

[0032] The components of the coating in this embodiment are proportioned according to the following parts by weight: 70 parts of epoxy powder, 16 parts of curing agent, 12 parts of rare earth oxide, 12 parts of fluorite powder, the particle size of the epoxy powder is 70 μm, The rest of the steps are the same as in Example 1, and will not be repeated here, wherein, the electrostatic voltage is 70 kV, and the spraying distance is 160 mm.

[0033] After cooling to form a film, visually observe that the coating surface is smooth, uniform in color and free of bubbles. Use a thickness gauge to detect the coating thickness at three different positions on the electrode, and measure the coating thickness at 4 points evenly distributed around the circumference of each position. The coating thicknesses at these three positions are 0.17mm and 0.18mm respectively. , 0.21mm, in line with the design requirements of the coating.

Embodiment 3

[0035] The components of the coating in this embodiment are proportioned according to the following parts by weight: 75 parts of epoxy powder, 20 parts of curing agent, 15 parts of rare earth oxide, 15 parts of fluorite powder, the particle size of the epoxy powder is 120 μm, The rest of the steps are the same as in Example 1, and will not be repeated here, wherein, the electrostatic voltage is 75 kV, and the spraying distance is 190 mm.

[0036] After cooling to form a film, visually observe that the coating surface is smooth, uniform in color and free of bubbles. Use a thickness gauge to detect the coating thickness at three different positions on the electrode, and measure the coating thickness at 4 points evenly distributed around the circumference of each position. The coating thicknesses at these three positions are 0.18mm and 0.21mm respectively. , 0.21mm, in line with the design requirements of the coating.

[0037] In summary, the present invention uses a powder electr...

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Abstract

The invention discloses a waterproof and moistureproof covered electrode coating suitable for underwater wet welding. The covered electrode coating comprises, by weight, 65-75 parts of epoxy powder, 15-20 parts of a curing agent, 10-15 parts of a rare earth oxide and 10-15 parts of fluorite powder, wherein the curing agent is a mixture of a T-31 curing agent and diethylenetriamine. According to the covered electrode coating, the problem of moisture absorption of a covered electrode can be fundamentally solved, and meanwhile, an effect of promoting the underwater wet welding process can be achieved.

Description

technical field [0001] The invention belongs to the technical field of underwater wet welding, and in particular relates to a waterproof and moisture-proof electrode coating suitable for underwater wet welding and a spraying method thereof. Background technique [0002] Welding rods must be waterproof and moisture-proof during storage and transportation, and must be dried before use. The moisture in the coating has a crucial influence on the performance of the electrode and the quality of the weld after welding. If the welding rod is not stored properly, after absorbing the moisture in the environment, the welding core will be easily corroded, and the coating on the surface of the welding rod will easily produce "white flowers", that is, returning to alkali, and even cause the coating of the welding rod to stick and fall off, seriously affecting The performance of welding rod. The moisture in the coating will become the main source of hydrogen during the welding process. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/06B05D3/00B05D3/04B05D5/00B05D7/24
CPCB05D1/06B05D3/002B05D3/0426B05D5/00B05D7/24
Inventor 张婧杨振林孔祥峰李海新殷子强杜永鹏张琳琳袁新彭欣
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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