In vacuum-arc remelting furnaces, remelting takes place inside the vacuum chamber of the consumable electrode. Exposure of molten metal droplets to vacuum reduces their free gas content, making it possible to obtain a purer material with fewer impurities.

Characteristics :   

Description:
Higher quality results and repeatability of the process are provided by automated computer control of the melting process, which eliminates the need for operator intervention. The final product is a dense ingot with a minimum amount of impurities and a low content of hydrogen and oxygen. In the VAR process, the consumable electrode is melted by maintaining a controlled electric arc in a vacuum. The arc burns between a negatively charged consumable electrode (cathode) and a crucible (anode) and forms a pool of molten metal. The size of the arc gap is controlled with high precision, which makes it possible to control the melting rate of the electrode.
An improved control system based on specially developed algorithms that take into account the weight of the unused electrode, measurements of the arcing voltage and other parameters, allows you to control the gap between the electrode and the rate of metal melting. Metal refining occurs due to the fact that falling into the arc gap, metal drops are exposed to vacuum and extremely high temperatures in the arc burning zone. This leads to the removal of dissolved gases from the melt, the evaporation of impurities, and a decrease in the content of oxides in it. Thanks to the water-cooled crucible, the crystallization of the molten metal in the ingot occurs in a directed way. With proper control of the melt velocity and arc gap, controlled cooling prevents the segregation of impurities, reduces their segregation in the metal, thereby improving its properties. Toward the end of the VAR process, the power is gradually reduced to ensure the maximum yield of suitable products.

Design features and equipment:

•      Water cooling of the furnace body and door, current leads and cooling gas circulation pipes. Gas cooling system with powerful fan and water heat exchanger.
•      A large set of additional components at the discretion of the customer.
•      Light and sound signaling of violations in the operation of furnace systems with display.
•      Vacuum pumps - Edwards, England or Laybold, Germany,
•      Vacuum - Edwards, England or Laybold, Germany. Included in the State Register of Measuring Instruments of the Russian Federation.
•      Controller - Siemens, Germany.
•      Temperature control - thermocouples made in Russia, Included in the State Register of Measuring Instruments of the Russian Federation

Note:
Characteristics are indicated for standard models, we offer furnaces with non-standard dimensions, an increased working area according to the technical specifications of the customer.