1. Principle
In a vacuum environment, an electric arc is generated between the bottom of the self-consuming electrode (cathode) and the bottom of the crucible (anode). Once the arc forms, it rapidly creates a molten metal pool. The arc-heating zone—located between the electrode's base and the upper surface of the material being melted—is precisely maintained under controlled melting-rate conditions.
Arc melting under vacuum conditions enables metals to undergo degassing, deoxidation, and impurity removal, resulting in the production of pure metal ingots. As the molten metal cools and solidifies within a water-cooled copper crucible, precise control over the high melting rate and the arc-heating zone ensures consistent solidification direction. This approach also prevents macrosegregation during solidification while significantly reducing the occurrence of microsegregation, thereby greatly enhancing the metallurgical properties of the final ingot.
The QVAR vacuum arc melting furnace is primarily used for melting, refining, and casting ingots of easily oxidized metals and alloys such as titanium and zirconium, as well as high-temperature refractory metals and alloys like niobium and tantalum, and for refining stainless steel and superalloys.
2. Technical Features
2.1 Furnace Structure: One power supply unit paired with two electric arc furnaces
2.2 Maximum Melting Capacity: 15 tons (calculated in titanium)
2.3 Maximum Melting Current: 40 kA
2.4 Melting Voltage: 10V–60V
2.5 System leak rate: 1 × 10⁻⁶ Pa·L/S
2.6 Mold: Water-cooled copper mold with a flanged, modular design for easy assembly and disassembly;
2.7 Electrode Rod: Stainless steel water-cooled jacket with an inner lining of conductive purple copper tubing;
2.8 Non-copper conductive flanges are fabricated with copper buildup followed by machining, ensuring safe and reliable electrical contact while enhancing durability and extending service life.
2.9 The vacuum unit is equipped with an oil sump filter to extend the unit's service life and reduce production costs.
2.10 Auxiliary conductive device ensures coaxial power supply;
2.11 Ground insulation treatment to enhance electrical efficiency and save energy;
2.12 High-Definition Camera 360° Monitoring of Arc Melting Process
2.13 The melting process can be controlled automatically or manually.
3. Specifications and Model Types
| Technical Specifications \u0003\u0003Product Models | QVAR-1T | QVAR-3T | QVAR-5T | QVAR-10T | QVAR-15T | |
| 1 | Melting materials | Titanium and Titanium Alloys | Titanium and Titanium Alloys | Titanium and Titanium Alloys | Titanium and Titanium Alloys | Titanium and Titanium Alloys |
| 2 | Maximum Melting Capacity | 1.5T | 3T | 6T | 12T | 16T |
| 3 | Extreme vacuum level | 5 × 10 -2 Pa | 5 × 10 -2 Pa | 5 × 10 -2 Pa | 5 × 10 -2 Pa | 5 × 10 -2 Pa |
| 4 | Pressure rise rate | 1Pa/Hr | 1Pa/Hr | 1Pa/Hr | 1Pa/Hr | 1Pa/Hr |
| 5 | System Leakage Rate | 1 × 10 -6 PaL/S | 1 × 10 -6 PaL/S | 1 × 10 -6 PaL/S | 1 × 10 -6 PaL/S | 1 × 10 -6 PaL/S |
| 6 | Work vacuum level | 1 × 10 -1 ~5 Pa | 1 × 10 -1 ~5 Pa | 1 × 10 -1 ~5 Pa | 1 × 10 -1 ~5 Pa | 1 × 10 -1 ~5 Pa |
| 7 | Pumping rate | Achieving an atmospheric pressure of 1.33 Pa within ≤20 minutes | ||||
| 8 | Maximum diameter of the crucible | 440mm | 540mm | 680/720mm | 920/1040mm | 1040/1150mm |
| 9 | Electrode rod diameter | F160mm | F160mm | Φ200mm | Φ300mm | Φ300mm |
| 10 | Auxiliary electrode | F150 × 450 mm | F150 × 450 mm | F180 × 800mm | Ф270 × 800mm | Ф270 × 800mm |
| 11 | Rated current | 12KA | 20KA | 32KA | 40KA | 40KA |
| 12 | Operating Voltage | 10–60 V | 10–60 V | 10–60 V | 10–60 V | 10–60 V |
| 13 | Stabilizing Arc Coil: | AC/DC electromagnetic stirring current: 0–30 A, with time intervals ranging from 3 to 300 seconds | ||||
| 14 | Electrode rod stroke: | The copper flange at the bottom of the electrode rod extends 200 mm beyond the copper flange at the bottom of the furnace body, within the range of 1500 mm to 2500 mm. | ||||
| 15 | Electrode lifting speed | Servo drive, up to 600 mm/min | ||||
| 16 | Furnace rotation speed | Up to 4,500 mm/min | ||||
| 17 | Equipment ground height | 9000mm | 10000mm | 10000mm | 10600mm | 11000mm |
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Company Profile
Shenyang 7D New Materials Equipment Technology Co,. Ltd. Founded jointly by a team of experienced technical and management professionals with over a decade of expertise in the R&D, design, and manufacturing of precision instruments and vacuum equipment, Qivi Technology is a high-tech enterprise established in 2019. The company specializes in the research, development, production, and sales of specialized precision equipment for laboratory material preparation, as well as large-scale vacuum thermal processing systems. Leveraging cutting-edge design concepts, meticulous manufacturing processes, and robust R&D capabilities, Qivi Technology offers comprehensive solutions—ranging from new material development to full-scale production line construction—to universities, research institutions, and industrial enterprises.
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Vacuum Arc Remelting Furnace
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