Product Overview | Understand VMT VAR Furnaces in One Article

1. Product Introduction: What is a Vacuum Arc Remelting (VAR) Furnace?

Vacuum Arc Remelting (VAR) is the core refining equipment for secondary remelting of high-end metallic materials. Using a DC arc as the heat source, the consumable electrode is gradually melted, transferred as droplets, and directionally solidified in a high-vacuum environment with a water-cooled copper mold. This process produces metal ingots with high purity, low segregation, dense microstructure, and uniform composition.

2. Industry Pain Points: Persistent Bottlenecks of Traditional VAR Equipment

• Unstable arc and droplet control:

  Prone to arc extinction, side arcing, and spattering, with inconsistent droplet size, directly leading to ingot segregation, inclusions, and porosity, resulting in low yield rates.

• Loss of active elements:

  Insufficient precision in vacuum and thermal field control causes easy loss of active elements such as titanium and aluminum, failing to meet the composition requirements of high-end materials.

• High risk of contamination:

  Reliance on hydraulic systems leads to leakage risks, and oil contamination degrades melt purity.

• Low product yield:

  Improper melt pool design causes central shrinkage and porosity, increasing material loss in subsequent processing and raising production costs.

• Insufficient intelligence and safety:

  Dependent on manual experience, with high operational risks, frequent equipment failures, high maintenance costs, and poor production consistency.

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3. Four Core Advantages: Setting a New Industry Benchmark

• Extreme purity, zero contamination:

  Fully electric drive replaces hydraulic systems, completely eliminating leakage risks. An ultra-clean vacuum chamber with a high-efficiency pumping system maintains a stable vacuum level down to the 10⁻³ Pa range, enabling deep degassing and purification to ensure ingot purity from the source.

• Precise melting control, defect-free products:

  Core technologies enable full-process precise control of droplets, arc, and melting rate, fundamentally eliminating quality hazards such as segregation, inclusions, and porosity, and significantly improving ingot yield.

• Intelligent and efficient, labor-saving and reliable:

  Equipped with a domestic intelligent integrated control system with preset process recipes for one-key startup. Full-process data is traceable via the cloud, enabling unattended production, reducing manual dependence, and enhancing consistency and efficiency.

• Safe, reliable, and long-term stable:

  A three-level anti-misoperation system and split closed-circuit water cooling system ensure all-round operational and equipment safety. Custom-designed key components support uninterrupted operation, greatly reducing maintenance costs and ensuring stable production capacity.

4. Four Core Technological Highlights: Building an Unassailable Technical Barrier

• Intelligent droplet control technology:

  Adjustable minute-level droplet frequency with dual-loop PID dynamic adjustment of arc length through “melting rate outer loop + current inner loop”. Supports short-arc melting with melting rate precision up to ±0.125%, completely solving arc instability and droplet disorder. Ingot yield exceeds 99.5%, providing the core foundation for precise melting control.

• Coaxial conductive system technology:

  The furnace body and mold form the anode circuit, while the electrode and conductive rod form the cathode circuit. Coaxial reverse current design with flexible braided conductors ensures uniform current distribution, eliminates uncontrolled magnetic fields in the melt pool, stabilizes the arc, reduces energy consumption per ton of steel, and achieves both energy saving and quality improvement.

• Helium shallow melt pool cooling technology:

  99.999% ultra-high-purity helium is injected into the mold gap to enhance heat transfer between the ingot and copper mold, forming a shallow, flat melt pool. This greatly reduces segregation in sensitive alloys, eliminates ingot shrinkage, increases product yield by more than 10%, and further ensures extreme purity and ingot quality.

• Intelligent integrated control system:

  Embeds the full process of electroslag and consumable melting, supporting automatic sintering and precise parameter regulation. Preset process recipes enable one-key operation with full data traceability, eliminating reliance on manual experience and increasing production efficiency by 30%, serving as the core platform for intelligent and efficient operation.