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A crack-resistant and wear-resistant powder material for plasma spray welding of triple-eccentric butterfly valves

A triple eccentric butterfly valve, powder material technology, applied in the direction of plasma welding equipment, welding/cutting medium/material, welding medium, etc., can solve the problem of affecting the performance of the spray welding layer, uneven surface of the spray welding layer, and cracks in the spray welding layer And other problems, to achieve the effect of broad commercial prospects, improve manufacturability, prolong wear cycle and service life

Inactive Publication Date: 2016-01-06
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional plasma spray welding alloy powder is used for plasma spray welding on the sealing surface of the triple eccentric butterfly valve. Intermittent problems such as cracks, pores and surface unevenness of the spray welding layer will appear in the spray welding layer, especially crack defects, which directly affect the use of the spray welding layer. performance, resulting in a 5%-9% rejection rate in the production of triple eccentric butterfly valves. Therefore, preventing cracks in the spray welding layer has also become a difficult point to be overcome urgently for powder materials for plasma spray welding of triple eccentric butterfly valves; the search found that the current plasma spray welding There are few patents for powder, and the patent with the publication number CN1733961 has announced high-performance valves and valve sealing surfaces by plasma spray welding Fe-based alloy powders, and alloys of Ni, Cr, Mo, C, Si, and Mn are added on the basis of Fe. Elements; the publication number is CN101837524A patent, and its composition is: the formula alloy composition is: chromium 33%-40%, titanium 12%-19%, nickel 6%-13%, vanadium 2-5%, molybdenum 2-6% , boron 4.5%-5%, silicon 2-3%, carbon 4%-5.5%, iron balance; the patent with the publication number CN86108069 discloses a high temperature impact wear resistant plasma spray welding nickel base alloy plus carbide compound Powder coating materials; the above patents have better solved the wear resistance of plasma spray welding. The wear resistance of the welding layer, however, with the formation of a large number of hard and brittle intermetallic compounds in the spray welding pool, the probability of cold cracks in plasma spray welding is greatly increased, resulting in 5%-9% of waste products in the current production of triple eccentric butterfly valves Rate

Method used

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  • A crack-resistant and wear-resistant powder material for plasma spray welding of triple-eccentric butterfly valves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The spray welding process test of Φ700 butterfly valve was carried out with the plasma spray welding equipment of triple eccentric butterfly valve. The mass percentage of each component of the alloy powder material is calculated as C: 0.15%; B: 1.5%; Si: 2%; Cr: 18%; Ni: 8%; Zr: 1%; Mn: 0.2%; Mo: 2%; W: 1%; Co: 2%;

[0016] Its process parameters are: welding torch height: 10mm; main arc current: 80A; maintenance arc current: 10A; turntable speed: 0.12 (display value of control box); powder feeding motor: 48V (no load), 31V (load); ion gas Flow: 0.38m 3 / h; shielding gas flow: 0.05m 3 / h; powder feeding air flow: 0.1m 3 / h; swing amplitude: 3.8mm; swing frequency: 3Hz; swing dwell time: left=right=1.2s.

[0017] Test results: The spray welding surface of the butterfly valve is fully piled up and both sides are raised, the width is about 18mm, the thickness is about 3.5mm, the appearance is good, the measured hardness of the spray welding layer is HRC: 42.6, the overa...

Embodiment 2

[0019] The spray welding process test of Φ700 butterfly valve was carried out with triple eccentric butterfly valve plasma spray welding equipment, and the mass percentage of each component was calculated as C: 0.25%; B: 2.5%; Si: 3%; Cr: 22%; Ni: 11%; Zr: 2%; Mn: 0.2%; Mo: 2%; W: 2%; Co: 3%; Ce: 1%; the balance is Fe; spray welding powder particle size: 100 mesh

[0020] Its process parameters are: welding torch height: 12mm; main arc current: 115A; maintenance arc current: 38A; turntable speed: 0.17 (display value of control box); powder feeding motor: 48V (no load), 31V (load); ion gas Flow: 0.38m 3 / h; shielding gas flow: 0.2m 3 / h; powder feeding air flow: 0.25m 3 / h; swing amplitude: 4mm; swing frequency: 3Hz; swing dwell time: left=right=1.5s.

[0021] Test results: The spray welding surface of the butterfly valve is fully piled up and both sides are raised, the width is about 18mm, the thickness is about 3.5mm, the appearance is good, the overall shape meets the req...

Embodiment 3

[0023] The spray welding process test of Φ900 butterfly valve was carried out with triple eccentric butterfly valve plasma spray welding equipment, and the mass percentage of each component was calculated as C: 0.1%; B: 1.5%; Si: 2%; Cr: 17%; Ni: 8%; Zr: 1%; Mn: 0.2%; Mo: 1.5%; W: 2%; La: 0.5%; Ce: 1%; the balance is Fe; the particle size of spray welding powder: 120 mesh

[0024] Its process parameters are: welding torch height: 12mm; main arc current: 115A; maintenance arc current: 38A; turntable speed: 0.17 (display value of control box); powder feeding motor: 48V (no load), 31V (load); ion gas Flow: 0.38m 3 / h; shielding gas flow: 0.2m 3 / h; powder feeding air flow: 0.25m 3 / h; swing amplitude: 4mm; swing frequency: 3Hz; swing dwell time: left=right=1.5s.

[0025] Test results: The spray welding surface of the butterfly valve is fully piled up and both sides are raised, the width is about 19mm, the thickness is about 3.4mm, the appearance is good, the overall shape meet...

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Abstract

The invention relates to a spraying welding material for reinforcing abrasion resistance of the surface of a component, in particular to an alloy powder material for plasma spray welding of a three-eccentric center butterfly valve. The alloy powder material is characterized in that rare earth elements La and / or Ce are added into the alloy powder for the plasma spray welding of the three-eccentric center butterfly valve, the abrasion resistance of the sealing surface of the three-eccentric center butterfly valve is improved by about 30% after plasma spray welding, the spray welding layer is smooth, uniform and free of air holes and cracks, the abrasion cycle and the service life of the three-eccentric center butterfly valve are prolonged, and on the premise of guaranteeing that the process of the plasma spray welding of the three-eccentric center butterfly valve is finished, abrasion resistance, corrosion resistance and high temperature flushing resistance of the sealing surface of the three-eccentric center butterfly valve are obviously improved.

Description

technical field [0001] The invention relates to a spray welding material for component surface wear-resisting strengthening, in particular to an alloy powder material for plasma spray welding of a triple eccentric butterfly valve. Background technique [0002] Triple eccentric butterfly valve is a new type of valve that has appeared in recent years. It consists of a butterfly plate and a valve seat. It has the advantages of good shut-off performance, less leakage at the valve stem, good adjustment performance, high flow rate, and corrosion resistance. , is widely used in petroleum, gas, chemical industry, metallurgy, shipbuilding, water conservancy and boiler piping systems; the plasma spray welding process uses argon plasma arc as a high-temperature heat source, and uses self-fluxing alloy powder as a surface of filling metal The new technology of deposited alloy is a new method of surface hardening and material protection, which has been widely used in engineering repair a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K10/02
CPCB23K35/0255B23K35/3066B23K2101/34
Inventor 李惠焦雷成宇虹陈克选李春旭王研
Owner JIANGSU UNIV OF SCI & TECH