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Compact Arc Melting System (250A ) w/ Vacuum Casting Function - EQ-SP-MSM208

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Item Number: SP-MSM208
EQ-SP-MSM208 is a compact arc melting furnace with a Vacuum Suction Casting functionSuch a unique feature can produce cast products ( 6mm Dia. rod shape, up to 30g) by drawing the molten metal into the bottom cold copper casting mold.  The sucking force applied results in a fast-moving and cause rapid solidification of the melt which is ideal for reducing the shrinkage cavity defects. The machine also features a built-in mechanical manipulator for tilting and rotating metal ingots if the re-smelting process is needed. The SS304 chamber ensures a clean and healthy atmosphere suitable for the most demanding experimental requirements. 
Notes:( Sealing tube option added on Dec 12, 2018)  Upgrade Max current to 250A, since July 15, 2023


  • Utilize the vacuum force to draw melt into the casting mold at the bottom to form a 6mm Dia. rod.
  • Designed for melting samples < 10 g iron-based alloy up to 3000 °C under tiny positive pressure or low vacuum
  • Water-cooled SS vacuum chamber, electrode, and copper crucible allows arc melting of multiple samples without cross-contamination
  • Powerful arc melting power supply enables reliable, stable arc ignition
  • Easy electrode tilting and height adjustment via a handwheel
  • A built-in mechanical manipulator for tilting and rotating samples without breaking the vacuum
  • A tinted observation window on the front for monitoring the melting process
           Casting Module       Chamber Door       Front Window       Flashlight Insert        Manipulator
Vacuum Chamber
  • Water-cooled vacuum chamber with dimensions of Φ 182 mm × 225 mm H
  • A Φ120mm front door for easy sample loading and retrieving
  • A tinted observation window on the front for monitoring the melting process
  • A built-in mechanical manipulator for tilting and rotating samples without breaking the vacuum
  • Material: Made of SS304 Steel
Vacuum Suction Casting & Copper Crucible 

  • Vacuum suction casting 6mm Dia. rod, 30g max.  (3 - 8 mm dia. or 1 - 3 mm thick strip casting mold is available upon request). Please see Pic. 2 for 3 mm x 70 mm rod and Pic. 3 for 1 mm thick strip.
  • The sucking force is generated by evacuating the bottom cold copper casting mold. This results in rapid solidification of the melt which is ideal for reducing the shrinkage cavity defects 
  • One solenoid valve is built-in for vacuum casting operation
  • The water-cooled copper crucible has 7 cavities:
  • The central cavity (50mm dia. x 10mm depth) is for vacuum casting
  • The other six-round cavities (20 mm Dia. × 8 mm depth) are reserved for metal alloy pellet preparation, max. 10g
  • Note: The Copper Mold has been upgraded to the above dimensions since 08/2021 (pic.1 & 2).
  •  pic.1     pic.2    Pic. 3    
Vacuum Pressure Gauge

Vacuum Pump (Optional)

  • The vacuum level is dependent on the vacuum pump used:
    • 10^-3 torr via a mechanical/roughing pump. (Roughing Pumps
    • 10^-5 torr via a turbopump. 
Power Supply  

  • 7000W (250A) arc melting power supply
  • 208-240VAC, 1 and 3 ph, 50/60Hz. 
  • @240V 1 Ph: 32A  (50A breaker)    @240V 3 Ph: 16A (30A breaker)
  • Output DC output duty cycle:
    • 60% @ 250A, 100% @ 200A 
  • Minimum DC current output: 10 A
  • Foot pedal control of the output current
  • Tungsten Electrode

  • 4 mm Dia. tungsten electrode with water coolingNon-consumable tungsten arc stinger
  • Easy electrode tilting and height adjustment (30 mm max) for multiple-cavity melting
  • Capable of melting samples < 10g up to 3000 °C, which can melt all types of metals
  • Pic. A is a 4.5 g tungsten melt drop 
  • Pic.B is a 10 g tungsten melt drop
               A.4.5 g       B.10 g                
Options at extra cost Crucible
  • A larger copper crucible with  55 Dia x 10D (mm) as the pic below (Pic.1-3), with a modified electrode tip 300A power supply, the furnace can melt and cast 50 g SS304.  Please contact MTI to request a quote.
  • The furnace can be used for sealing Ta or any alloy tube by optional rotation module as the Pic below  (Pic.4-7)
       Pic.1                     Pic.2                      Pic.3                                Pic.4                                  Pic.5                               Pic.6                          Pic.7

Tilt Casting Kits

Water Chiller & Gas (Optional)
  • Water cooling is required (not included) for the chamber, copper mold, and electrode.
  • Please consider our KJ-5000 recirculating water chiller.
  • Water-tube for MTI Water Chiller is Size: 12mm O.D x 8mm I.D
  • High-purity inert gas with at least 5N purity (>99.999%) is required (not included)
  • 5% Hydrogen + 95% Argon gas may be used to prevent oxidation during the melting process
Furnace Dimensions 

  • 540 mm W × 540 mm D × 920 mm H (exclude the power supply) 
  • Power supply dimension: 320 mm L x 185 mm W x 485 mm H
Net Weight
  • 50 kg
Shipping Weight & Dimensions
  • 500 lbs
  • 48" x 40" x 52"
  • CE certified
  • NRTL or CSA certification is available at an extra fee. Please contact us for the quote.
  • One-year limited warranty with lifetime support
Operation  Video         
Related Article
Application & Warning Notes

  • High purity 》5N Ar gas is required for the smelting operation. 
  • A two-stage pressure regulator must be installed on the gas cylinder to limit the pressure to below 3 psi for safe operation. Click here to learn about the installation of a gas regulator (Pic.1)
  • To avoid any damage to the mechanical pump or turbopump, please install an Inline Particle Trap (maximum 1E-4 Torr vacuum with turbopump) on the pump inlet port (Pic. 2)
  • Must Wear Welder Glass or Auto Welding Shade while observing the Arc while welding. 
  • The unit is designed for arc melting operation under positive 0.01 MPa to negative 0.09 MPa pressure). Never operate the unit at a high vacuum or high positive pressure!
  • During melting operation, never allow the electrode to touch the material or the copper crucible! Do not operate the mechanical manipulator during the melting process.
  • Option: The user may use quartz tube shielding to effectively reduce the splash and spilling while arc melting. Please click pic 3 to watch the demo video.
                1         2            3    
  • Note: Since July 20, 2020, cavity size is changed to 20 mm dia, and the casting mold is changed to place from top 

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