TEH TWA280-MMA140 Inverter Welding Machine

Specifications

• Type: Inverter welding machine for manual metal arc welding (MMA).
• Supply voltage: 160–270 V (single-phase, 50/60 Hz).
• Rated input current: 26.6 A.
• Welding current range: 20–140 A.
• Rated output voltage: 25.6 V.
• Open-circuit voltage: 35–50 V.
• Duty cycle (DC): 60% at 140 A.
• Electrode diameter: 1.6–4.0 mm.
• Efficiency: ~80%.
• Power factor: 0.7–0.8.
• Insulation class: F (withstands up to 155°C).
• Protection class: IP21S (protection against solid objects and water splashes).
• Features:
  • Hot Start function for easy arc ignition.
  • Arc Force function for stable arc burning.
  • Anti-Sticking function to prevent electrode sticking.
  • Overheat and overload protection.
  • Operation at unstable supply voltage (160–270 V).
  • Open-circuit losses: ~35–50 W.
• Dimensions: ~220×340×220 mm (approximate, confirm with supplier).
• Weight: ~4.5–5.0 kg.
• Packing: Welding machine, electrode holder cable (2 m, 25 mm²), earth clamp cable (2 m, 25 mm²), carrying strap, user manual.

Advantages

• Lightweight and compact, convenient for carrying and working in confined spaces.
• Stable operation at unstable voltage (suitable for a cottage or garage).
• Simplified welding thanks to Hot Start, Arc Force, and Anti-Sticking functions.
• Energy efficiency (efficiency ~80%) and low open-circuit losses (35–50 W).
• Robust metal casing, resistant to mechanical damage.

Applications

• Welding of carbon, low-alloy, alloy steels, cast iron, and non-ferrous metals.
• Household tasks: repair of metal structures, fence fabrication, small workshop jobs.
• Use on cottages, in garages, on small construction sites.
• Limitations:
  • Not designed for welding aluminum in TIG mode without additional equipment.
  • Do not use in high humidity or under rain (protection class IP21S).
  • Not suitable for prolonged use with electrodes over 4 mm in diameter or at high currents without breaks.

Instructions for use

1. Check the integrity of the machine, cables, and accessories before starting work.
2. Connect the earth clamp cable to the workpiece, and the electrode holder cable to the electrode (diameter 1.6–4.0 mm).
3. Connect the machine to the 220 V (160–270 V) supply.
4. Set the welding current (20–140 A) using the regulator on the front panel.
5. Use protective gear (mask, gloves, clothing).
6. Start welding, holding the electrode at an angle of 70–80° to the surface.
7. If overheating occurs, the machine will automatically shut off (indicator lights up); wait for cooling.
8. After use, disconnect the machine from the power supply, clean the cables, and store in a dry place.