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High-alkalinity slag nickel-based alloy welding rod and preparing method thereof

A nickel-based alloy, high alkalinity technology, used in welding equipment, metal processing equipment, welding media, etc., can solve problems such as mutual adhesion that cannot be effectively solved, achieve good anti-oxidation protection, good coverage uniformity, The effect of improving pressure coating performance

Active Publication Date: 2017-01-04
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the oxidation of the high-nickel molten pool metal and the inhibition of sulfur and phosphorus in the weld metal have been solved to a certain extent, it still cannot effectively solve the problem of uniform coverage of the molten pool by the slag and the mutual adhesion between the slag and the high-nickel weld metal. Combination and other workmanship defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: the high basicity slag nickel base electrode of this embodiment, coating composition is as follows: CaCO 3 : 35%, BaCO 3 :11%, CaF 2 : 35%, BaF 2 : 2%, Ti-Fe: 6%, Mn: 5%, Si-Fe: 4%, SiO 2 : 3%, Al 2 o 3 : 4%, K 2 TiO 3 :8%, Cr: 3%, Ni: 2%, KBFO 4 : 1%, CMC: 1%.

[0023] Dry mix the obtained powder, then add potassium sodium water glass with a potassium-sodium ratio of 1:1, a modulus M=3.1, and a Baume concentration of 41-43ºBe´ and continue stirring to make a coating. Then apply the stirred coating coating evenly on the welding core on a 25-ton welding rod hydraulic press, and press the welding rod with a diameter of 4.0 mm with a die diameter of 6.4 mm. Afterwards, the pressed electrode was dried at a low temperature of 120°C for 2 hours, and then sent to a high-temperature drying furnace for baking at 380°C for 1 hour to obtain the electrode of Example 1.

Embodiment 2

[0024] Embodiment 2: the high basicity slag nickel-based electrode of this embodiment, coating composition is as follows: CaCO 3 : 40%, BaCO 3 :9%, CaF 2 : 30%, BaF 2 : 4%, Ti-Fe: 5%, Mn: 4%, Si-Fe: 5%, SiO 2 : 4.5%, Al 2 o 3 : 3.5%, K 2 TiO 3 :5.5%, Cr: 3.5%, Ni: 4%, KBFO 4 : 1.5%, CMC: 1.5%.

[0025] Dry mix the obtained powder, then add potassium sodium water glass with a potassium-sodium ratio of 1:1, a modulus M=3.1, and a Baume concentration of 41-43ºBe´ and continue stirring to make a coating. Then apply the stirred coating coating evenly on the welding core on a 25-ton welding rod hydraulic press, and press the welding rod with a diameter of 4.0 mm with a die diameter of 6.4 mm. Afterwards, the pressed electrode was dried at a low temperature of 120° C.×2 h, and then sent to a high-temperature drying furnace for baking at 380° C.×1 hour to obtain the electrode of Example 2.

Embodiment 3

[0026] Embodiment 3: the high basicity slag nickel-based electrode of this embodiment, coating composition is as follows: CaCO 3 : 45%, BaCO 3 :7%, CaF 2 : 25%, BaF 2 : 8%, Ti-Fe: 4%, Mn: 3%, Si-Fe: 6%, SiO 2 : 6%, Al 2 o 3 : 3%, K 2 TiO 3 : 3%, Cr: 4%, Ni: 6%, KBFO 4 : 3%, CMC: 2%

[0027] Dry mix the obtained powder, then add potassium sodium water glass with a potassium-sodium ratio of 1:1, a modulus M=3.1, and a Baume concentration of 41-43ºBe´ and continue stirring to make a coating. Then apply the stirred coating coating evenly on the welding core on a 25-ton welding rod hydraulic press, and press the welding rod with a diameter of 4.0 mm with a die diameter of 6.4 mm. Afterwards, the pressed electrode was dried at a low temperature of 120° C.×2 h, and then sent to a high-temperature drying furnace for baking at 380° C.×1 hour to obtain the electrode of Example 3.

[0028] The experiment proves that the slag of the high-basic coated nickel-based electrodes of E...

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Abstract

The invention discloses a high-alkalinity slag nickel-based alloy welding rod and a preparing method thereof. Slag formed through welding of high-alkalinity coatings composed of various carbonate and villiaumite alkaline slagging substances has a very good anti-oxidization protection function on nickel-based molten pool metal; meanwhile, part of calcium carbonate is replaced with barium carbonate, part of sodium fluoride is replaced with barium fluoride, the excessively large surface tension of liquid slag due to the too high content of the single calcium carbonate and the single calcium fluoride can be obviously reduced as well, and good covering uniformity of the slag on a liquid molten pool is achieved. Potassium fluoborate is adopted as a coating additive and is evenly scattered in powder through hydroscopicity of the potassium fluoborate to improve the pressing and coating performance of the coatings, capillary holes in the surface and the interior are sealed and blocked after condensation, and therefore the beneficial effects that the strength of the coatings is improved, and the surface smoothness of the welding rod coatings is improved are achieved.

Description

technical field [0001] The invention relates to a high-basic slag nickel-based alloy welding rod and a preparation method thereof, in particular to a high-basic slag nickel-based alloy welding rod for Inconel625 type alloy welding, which belongs to the technical field of special welding materials. Background technique [0002] Inconel 625 nickel-based alloy has super low-temperature toughness, unique resistance to high-concentration chloride medium and severe corrosion resistance, and other irreplaceable properties of other alloys. It is widely used in petrochemical industry process equipment and energy, marine industry LNG storage Manufacture of cryogenic devices. [0003] The welding of Inconel 625 alloy, especially the electrode arc welding method, is affected by high temperature heating and metallurgical action of coating slag, which often damages the performance of the formed nickel-based weld, and it is difficult to meet the excellent properties of the base metal. In ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/365B23K35/40
CPCB23K35/0272B23K35/3066B23K35/3602B23K35/365B23K35/404
Inventor 李晓泉郝宗斌申赛刚
Owner NANJING INST OF TECH
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