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KARA DC TIG Welding Machine-KTW400


  • Possibility of Welding in All Positions
  • Possibility of Being Used with and without Filler Metal
  • Observable Molten Weld Pool and Electric Arc
  • Lack of any Slag or Flux

KARA DC TIG Welding Machine-KTW400

Technical Specifications

∆ Application

  1. Suitable for Welding Beams with Thin Thickness from 5.0 mm and above in Metal Industries
  2. Useful for Welding Various Metals (Except Aluminum) up to a Current Capacity of 400 Amp
  3. Possibility of Being Used in both Manual Welding and TIG Welding
Process Description Tungsten Inert Gas Welding (GTAW) is an arc welding process in which an arc is established between the non-consumable Tungsten electrode and work-piece. In TIG welding process, the electrode is not consumable but rather it supplies the electrical current and directs it towards the arc area. In this process, electrode can be used with and without the filler metal. Since there is no slag in TIG welding process, the electrode, the work-piece surface and filler metal need be protected by an inert shielding gas such as Helium, Argon, Hydrogen or a combination of them to avoid their contamination and faults. This process is also referred to as TIG and GTAW. In workshop terminology, Tungsten Inert Gas Welding process is recognized as Argon welding.


  1. Having an Output Current DC suitable for Long Performance and High Production Capacity (Heavy Duty)
  2. Equipped with an Up Slope potentiometer at the Start of Welding (Changeable)
  3. Equipped with a Down Slope potentiometer at the End of Welding (Changeable)
  4. Equipped with a Potentiometer with Digital Amperage for Adjusting the Current
  5. Having an HF and Start Welding System with High-Frequency Current
  6. Having a Cable, an Electrode Holder Welding tool, a Remote Controller and a Selection Switch
  7. Having a Sustainable Slow Arc for Achieving the Highest Welding Quality
  8. Equipped with a PLC Programming to Issue Commands and a Solenoid Valve to Control Shield Gas
  9. Having a T2 and T4 System
  10. Equipped with Pre-flow and Post-flow Gas Time


TIG Welding Torch (Optional and If Requested) Accompanied by an Air Cooled TIG Torch (If the Air Cooled System is selected) Accompanied by a Water Cooled TIG Torch (If the Water Cooled System is selected) Water Cooled Unit Equipped with a Flow Switch and an On/Off Signal Unit Having a Mechanism for Detecting Water Pressure and a Warning Signal to Cut off Water Supply A Manometer (Italy) (Optional and If Ordered)  

TIG Welding Machine-KTW400 Benefits

  1. Suitable for Welding All Metals (Manual/Machined)
  2. Lack of Welding Sparks
  3. Possibility of Welding in All Positions
  4. Possibility of Being Used with and without Filler Metal
  5. Observable Molten Weld Pool and Electric Arc
  6. Lack of any Slag or Flux
  7. Possibility of Applying both Alternating Current (AC) and Direct Current (DC)
  8. Having a Concentrated Arc and Less Distortion
  9. Suitable for Joint Root Pass Welding
  10. Suitable for Welding Active Metals such as Titanium, Zirconium, Aluminum or Manganese which Refractory Oxides

TIG Welding Machine Equipment

  • Power Supply (Supplying Heat for Melting Edge Joint and Steel Wire
  • Electrode (Typically Tungsten Electrode) and Filler Metal
  • Water Circulate Cooling System
  • Welding Cable
  • Welding Torch
  • Shielding Gas Supplier

Electric Current

Welding Amperage is considered as the most significant variable in this process. The higher the welding amperage is, the higher penetration depth of electric arc and molten material will be. If the electric current is a direct current (DC), the electric Tungsten can be connected to the negative or positive terminal of power source. This has been illustrated in the above picture.

Direct Current-Electrode Negative:

This state is called straight polarity and is very common in Tungsten Inert Gas Welding (GTAW). Electrode is connected to the negative terminal of power source. As we can see in the above picture, electrons are emitted from Tungsten Electrode and are accelerated passing through the electric arc.

Direct Current-Electrode Positive:

This state is called reverse polarity where the electrode is connected to the positive terminal of power source. In these conditions, the thermal effect of electrons is much more in Tungsten electrode than the work-piece since electron bombardment is towards electrode. Therefore, it is necessary to prevent electrode tip from being melted. The positive ions bombard the work-piece surface causing the oxide shells on the work-piece break down. This can be used for welding materials with hard oxide layers such as aluminum and Magnesium. The method for cleaning the work-piece surface is shown in the following picture.

Alternating Current (AC):

In this process, the penetration and cleaning oxide layers from work-piece surfaces can be performed effectively. This method can be used for welding aluminum.

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Welding & Cutting Ind. Mfg. Co