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Thermadyne S.A. Welding Information
Bulletin #15
The Thermadyne D.C. Stick Inverter
The THERMADYNE D.C. STICK INVERTER range consists of 140 amp, 160 amp and 200amp output capacity welding machines, all suitable for use on 220 volt input supply and generally used for maintenance applications. For production use we have a 250 amp and 400 amp, both suitable for use on 380 volt input supply. All units are rated at 60% duty cycle, are lightweight and have low amperage capabilities (i.e. 20 to 30 amps depending on the unit).
INVERTER welding machines are state of the art technology and makes use of solid state switching and rectification and filtration of the input voltage to produce very stable D.C. voltage and current. The input line voltage can either be single phase (220 volt or three phase 380/525 volt). Solid state control circuits are incorporated to provide excellent arc characteristics and line voltage compensation.
Important Features
- Lightweight portability is one of the main features to be considered when purchasing an Inverter welding machine for use on a specific range of maintenance or production applications.
- Input voltages covers all power inputs supplied in South Africa.
- The components can absorb up to 15% under or over line voltage variations.
- Inverters produce a stronger, more concentrated, smooth and state arc with excellent striking and re-striking capabilities.
- Inverters are ideally suited and versatile for use on all commercially available ferrous and non-ferrous metals. It will weld electrodes of different specifications, including basic (low hydrogen) and cellulosic types. Fine adjustment through the current range allows for precision welding on complex alloys.
- The stick Inverters (no high frequency facility) can be used for scratch start D.C. T.I.G. welding using straight (Negative -) electrode polarity when T.I.G. welding ferrous (steel) metals. (See Bulletin # 12)
- On thin metals using E6013 mild steel electrodes, the polarity can be reversed i.e. electrode negative (-) and ground (earth) (+). This allows for less burn through possibilities by using lower amperages.
- The Inverter is fitted with a V.R.D. (voltage reduction device) switch located at the back of the Inverter. This is a safety feature and when switched to the “ON” position, it reduces the initial open circuit voltage and safeguards the operator from electrical shock when welding in wet of damp areas. It effectively means that the voltage needed to start the arc is reduced and no arcing is established until (within a couple of seconds) the voltage increases to the level needed to establish the arc. This can also be used as a feature for use by an operator who wears a standard helmet (not required when using a automatic Solar Helmet) as the arc delay gives the operator time to down his helmet.
- The Inverters are fitted with an overload protection switch that is activated once the components reach overheating levels or the duty cycle is exceeded. (See INFOWELD No. 6.)
Proventitive Measures & Maintenance
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