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New technology of valve sealing element vacuum induction pile-up welding hard alloy and improved equipment

A cemented carbide, valve sealing technology, applied in metal processing equipment, welding equipment, metal processing and other directions, to achieve the effect of improving productivity, optimizing surfacing process, improving quality and stability

Inactive Publication Date: 2007-07-18
DALIAN DAGAO VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a new process and improved equipment for vacuum induction surfacing welding of hard alloys for valve seals, so as to solve the shortcomings of the existing processes and devices

Method used

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  • New technology of valve sealing element vacuum induction pile-up welding hard alloy and improved equipment
  • New technology of valve sealing element vacuum induction pile-up welding hard alloy and improved equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The improved vacuum high-frequency induction surfacing equipment is connected to the GP60 high-frequency machine, and the 3 / 4" (nominal diameter 20mm) valve seat process example is surfacing.

[0018] Seat material is 1Cr13. Its main chemical composition (mass fraction, %) is 0.10C, 1.00Mn, 1.00Si, 0.035P, 0.030S, 11.7Cr. The depth of the U-shaped groove on the pre-surfacing sealing surface is 2.0mm to 2.2mm, and the wall thickness of the U-shaped groove is 0.8mm to 1.0mm. 15 surfacing welds per furnace each time. Select 200 mesh (0.126mm) Stellite158D powder as the surfacing flux. The chemical composition (mass fraction, %) of the surfacing flux is 0.50C, 22.7Cr, 2.4Fe, 0.01Mn, 0.01Mo, 2.2Ni, 1.7Si, 4.6W, Yu Co. Using 3 / 4" tire hand wipe pressure molding, after drying and then high-frequency sintering surfacing welding, the vacuum degree in the surfacing process is 10 -1 Pa~10 -2 Pa, grid current 0.51A, anode current 1.6A, anode voltage 11KV, tank circuit voltage ...

Embodiment 2

[0020] The improved vacuum high-frequency induction surfacing equipment is connected to the GP60 high-frequency machine, and the surfacing welding process example of a valve seat with a full diameter of 2″ (outer diameter ￠58mm) is used.

[0021] The valve seat material is 1Cr13, and its main chemical composition (mass fraction, %) is 0.10C, 1.00Mn, 1.00Si, 0.035P, 0.030S, 11.7Cr. The depth of the U-shaped groove on the pre-surfacing sealing surface is 2.0mm to 2.1mm, the wall thickness of the U-shaped groove is 1.0mm to 1.10mm, and the amount of surfacing welding in each furnace is 6. 200 mesh (0.126mm) Co-L powder is selected as the surfacing flux. The chemical composition (mass fraction, %) of the surfacing flux is 0.70C, 0.95Si, 0.61B, 29.50Cr, 4.00W, 2.69Fe, and Co. It is molded by hand wiping and pressing with a full-diameter 2″ tire. After drying, it is then subjected to high-frequency sintering and surfacing welding. The vacuum degree during the surfacing process is 10...

Embodiment 3

[0023] Connect the improved vacuum high-frequency induction surfacing equipment to the GP60 high-frequency machine, and surfacing a 1 1 / 4 ″ (nominal diameter 32mm) valve seat process example.

[0024]Seat material is 1Cr13. Its main chemical composition (mass fraction, %) is 0.10C, 1.00Mn, 1.00Si, 0.035P, 0.030S, 11.7Cr. The depth of the U-shaped groove on the pre-surfacing sealing surface is 2.0mm-2.2mm, and the wall thickness of the U-shaped groove is 0.9mm-1.10mm. 12 surfacing welds per furnace each time. Select 200 mesh (0.126mm) Stellite158D powder as the surfacing flux. The chemical composition (mass fraction, %) of the surfacing flux is 0.50C, 22.7Cr, 2.4Fe, 0.01Mn, 0.01Mo, 2.2Ni, 1.7Si, 4.6W, Yu Co. The 1 1 / 4″ mold is hand wiped and pressed, dried and then subjected to high-frequency sintering and surfacing welding. The vacuum degree during the surfacing process is 10 -1 Pa~10 -2 Pa, grid current 0.54A, anode current 1.7A, anode voltage 11.2KV, tank circuit voltag...

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Abstract

The present invention relates to a new process for vacuum induction surfacing hard alloy on seal component of valve and its improved equipment. Said invention adopts the following technical measures: optimizing surfacing process: regulating U-shaped groove depth and groove wall thickness of sealing surface of sealing component to be surfaced; adopting cheap Stellite 158D and Co-L alloy powder; optimizing technological parameters of surfacing current, surfacing temperature, vacuum degree and valve seat rotating speed; improving surfacing equipment: adding and welding connecting plate and cooling device of furnace cover cooling system; intrafurnace workpiece and induction coil flange sealed position adopt heat-insulating material; a reflective mirror is mounted in the sighting window position; and on the vacuum pipeline system a leakage-detecting interface is added.

Description

technical field [0001] The invention relates to a vacuum induction surfacing welding process and equipment, and more specifically relates to a new process and improved equipment for vacuum induction surfacing welding of hard alloys for valve seals. Background technique [0002] At the end of the last century, manual surfacing welding methods were commonly used for valve sealing surfaces: flame, plasma or non-melting argon arc welding surfacing welding CoCrW hard alloy to improve the performance of valves such as corrosion resistance, wear resistance, heat resistance and surface dimensional formability. However, the above-mentioned surfacing welding method has high operational difficulties, high labor intensity, high material consumption, large splash of smoke (powder) and dust during welding, which not only pollutes the environment but also easily causes harm to the operator's body. The machining allowance is large, resulting in time-consuming and labor-intensive machining; ...

Claims

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Application Information

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IPC IPC(8): B23K1/002B23K3/08B23K3/00
Inventor 肖箭
Owner DALIAN DAGAO VALVE
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