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Sintered flux for submerged-arc welding for nickel-based alloy

A technology of sintering flux and submerged arc welding, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., and can solve problems such as cracks, weld porosity, weld strength, and plasticity decline

Active Publication Date: 2013-11-20
HOHAI UNIV CHANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the weld is well formed and slag is easy to remove, the resulting weld is prone to defects such as pores and cracks
Moreover, the weld metal obtained by using these fluxes has a coarse as-cast structure, strong grain orientation, and a thick eutectic film with a low melting point at the grain boundary, resulting in a decrease in weld strength and plasticity

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0020] According to the design component content of the present invention, the flux powder is prepared, and the flux adopts the common sintered flux production method, that is: dry mixing, wet mixing, granulation, low-temperature drying, and high-temperature drying of the powder composed of the components. The sintered flux is prepared by sintering, sieving, etc., and the particle size of the finished product is within the range of φ0.5-5mm. Considering the decomposition characteristics of carbonate, the sintering temperature is controlled in the range of 600-800 °C, and its composition is shown in Table 1.

[0021] Table 1 The specific composition of flux (by weight percentage)

[0022] CaF 2 MgO Al 2 o 3 CaCO 3 Ti mn 35 15 34 6 5 5

[0023] The developed flux and the nickel-based alloy submerged arc welding wire with a diameter of 3.2mm are used for cooperating tests. The MZ-1000 DC submerged arc automatic welding ma...

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Abstract

The invention discloses sintered flux for submerged-arc welding for nickel-based alloy, and belongs to the technical field of welding materials. The sintered flux comprises, by weight, 25-35% of CaF<2>, 10-20% of MgO, 30-40% of Al<2>O<3>, 5-10% of CaCO<3>, 3-8% of Ti and 3-8% of Mn. The sintered flux has the advantages of stable electric arcs, easiness in removing slag, attractive formed welding seams, smooth transition and capability of overcoming shortcomings such as welding cracks and the like in a welding procedure.

Description

technical field [0001] The invention relates to a sintered flux for nickel-based alloy submerged arc welding, which belongs to the technical field of welding materials. The flux is suitable for submerged arc welding of nickel-based alloy structural parts in petrochemical, metallurgy, atomic energy, ocean development, aviation, aerospace and other industries. Background technique [0002] Nickel-based alloys (Ni≥55%) are important structural materials, which are particularly sensitive to harmful components and can dissolve gases, so welding is difficult: on the one hand, liquid nickel can dissolve a large amount of O 2 、H 2 , and CO gas, and the solubility drops sharply during the condensation period, causing pores and hydrogen embrittlement, and due to the oxidation of nickel during welding, Ni-NiO low-melting eutectics are formed, and these low-melting eutectics are distributed on the grain boundaries during crystallization. It is prone to brittleness; on the other hand, ...

Claims

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Application Information

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IPC IPC(8): B23K35/362
Inventor 杨可
Owner HOHAI UNIV CHANGZHOU
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