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Air corrosion and fretting corrosion resistant surfacing welding electrode for hydraulic turbine

A technology of surfacing welding electrodes and water turbines, which is applied in the field of surfacing welding, can solve the problems of high cost, and achieve the effects of improved cavitation resistance, easy grinding, and moderate smoke and dust

Inactive Publication Date: 2005-09-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

The metallographic structure of the electrode is austenite plus alloy eutectic composition, medium hardness, easy to grind, and has good anti-cavitation performance and good anti-erosion wear performance, but because the electrode contains up to about 10% Ni content, higher cost

Method used

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Embodiment 1～2

[0015] The present invention takes two groups of welding rods as an example, the welding core is: 2Cr13 stainless steel welding core with a diameter of φ4mm, the length is 450mm, the weight coefficient of the coating used is 1.0, and the coating is made of CaCO 3 -CaF 2 -SiO 2 Alkaline low-hydrogen slag system, other alloying elements are contained in the coating of the electrode, the chemical composition of the surfacing alloy is listed in Table 1, and two sets of electrodes DG1 and DG2 were produced.

[0016] this invention

[0017] Compared with the comparative example 0Cr13Ni5Mo, the present invention replaces a part of nickel with part of manganese, and adds a small amount of trace elements Cu and B at the same time, and invents a CrMnNiB surfacing electrode. The hardness of the electrode is HRC30-45, and the metallographic structure is composed of metastable austenite and austenite + boride eutectic structure.

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Abstract

The present invention relates to bead welding technology, and is especially one kind of cavitation and abrasion resisting bead welding rod for water turbine. The bead welding rod consists of welding rod core and coating, and the bead welding alloy consists of C 0.25-0.80 wt%, Cr 14-20 wt%, Mn 4-9 wt%, Ni 3-7 wt%, B 0.7-1.4 wt%, Cu 0-0.8 wt% and Fe the rest. Compared with available martensite stainless steel 0Cr13Ni5Mo for welding water turbine, the bead welding alloy of the present invention has 5-22 times higher cavitation resisting performance and 1.5-2.6 times higher abrasion resisting performance, and is suitable for the protecting bead welding of water turbine part used in clear water and sandy water.

Description

technical field [0001] The invention relates to surfacing welding technology, in particular to an anti-cavitation and abrasion surfacing welding electrode for water turbines. Background technique [0002] Premature failure of hydraulic turbine flow components due to cavitation erosion and sediment wear is a common and extremely concerned problem in hydropower equipment, especially in the Yangtze River and Yellow River basins in my country. Due to the deterioration of the ecological environment, soil erosion is serious, and the sediment content in the water High, the damage of the turbine is particularly prominent. For this reason, the Chinese government has to invest a large amount of funds every year to overhaul the generator sets, plus the loss of stopping power generation during the flood season, the cost is quite astonishing. In order to solve this problem, people have been devoting themselves to the study of the damage mechanism of hydraulic turbines and the development...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/22B23K35/32
Inventor 姚治铭国旭明郑玉贵敬和民姜胜利
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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