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Fused flux used for welding 9Ni steel and preparation method of fused flux

A technology for smelting flux and flux, which is applied in the field of smelting flux for 9Ni steel welding and its preparation, can solve problems such as unsatisfactory slag detachability and pores, and achieve the effects of good production adaptability, good manufacturability, and good flux manufacturability

Active Publication Date: 2019-08-09
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention improves the raw materials on the basis of the prior art, and at the same time combines the preparation with a specific preparation method, so that the prepared smelting flux for welding 9Ni steel has good moisture absorption resistance, and solves the problem that the sintering flux is easy to produce when welding nickel-based alloys. Pores and unsatisfactory slag removal are more suitable for welding operations in field projects; it is a melting flux with good manufacturability and low temperature toughness, suitable for submerged arc flat welding and horizontal welding of 9Ni steel storage tanks

Method used

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  • Fused flux used for welding 9Ni steel and preparation method of fused flux
  • Fused flux used for welding 9Ni steel and preparation method of fused flux
  • Fused flux used for welding 9Ni steel and preparation method of fused flux

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Embodiment

[0040] According to the content of the components designed in the present invention, three kinds of powders were prepared, and the experimental flux was prepared according to the preparation process described in the present invention. The specific proportions are shown in Table 1. It should be noted that the present invention is not limited to these examples.

[0041] Table 1 Example composition ratio (wt%)

[0042]

[0043] The flux made of the above components is tested. Before the welding test, the flux is baked at 250°C~300°C for 2 hours, and then matched with ERNiCrMo-4 submerged arc welding wire respectively. Taking Φ2.4mm welding wire as an example, the welding process parameters are: The welding power supply is DC reversed, the welding current is 320~350A, the welding voltage is 28~30V, and the interpass temperature is 100~150℃. The test results are shown in Table 2~Table 3.

[0044] Table 2 Example flux matching ERNiCrMo-4 welding wire deposited metal chemical compos...

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Abstract

The invention relates to a fused flux used for welding 9Ni steel and a preparation method of the fused flux, and belongs to the field of welding materials. The fused flux comprises, by weight, 45-47 parts of wollastonite, 15-17 parts of CaF2, 25-27 parts of marble, 12-15 parts of potassium feldspar, 5-7 parts of ZrO2, 5-7 parts of MgO, 0.1-0.5 part of manganese ore, and 2.5-5 parts of BaO. The preparation method comprises the steps of material preparation, smelting, pelletizing, crushing and screening, drying, and packaging, wherein the granularity of the fused flux is 10-80 meshes. The fusedflux has the characteristic of good moisture-absorption resistance and is used in cooperation with an ERNiCrMO-4 nickel-based welding wire according with ASMEIISFA-5.14, the weldability and the mechanical performance of weld joints are good, the tenacity of weld metal at an ultralow temperature is stable and good, and the anti-heat-crack sensitivity is good.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a smelting flux for 9Ni steel welding and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy and the sharp decline of onshore oil resources, offshore oil and gas development has become a hot spot in my country's energy development. [0003] As a clean energy, natural gas has been paid more and more attention. In recent years, LNG (liquefied natural gas) projects have developed vigorously. At present, there are many LNG projects planned in China. 9Ni steel is considered fashionable due to its excellent low-temperature toughness and good weldability. Excellent materials for manufacturing cryogenic pressure vessels, the inner tank materials of LNG storage tanks are all made of 9Ni steel without exception. [0004] For the welding of 9Ni steel, domestic related research started relatively late, and some experien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/36
CPCB23K35/3601
Inventor 宋聚海范会卿薛旭斌
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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