The Oxford MULTI-TIG  AC DC 221 TIG inverter welder delivers outstanding TIG and MMA performance in a compact hand portable design. Built in the UK for maximum reliability, these machines combine rugged construction, precise arc control, and advanced TIG functionality for professional welding on aluminium, stainless steel, mild steel, titanium, and other alloys.

Advanced TIG Functions for Total Control

• 2T / 4T Torch Operation – Start instantly with 2T mode (press and hold to weld), or switch to 4T for trigger-latching during long welds.

• Adjustable Gas Pre-Flow & Post-Flow – Ensures perfect gas coverage before and after each weld, protecting the weld pool and electrode.

• Slope Up / Slope Down Controls – Provides smooth arc starts and crater filling for professional-grade weld finishes.

• Digital Current Control – Set welding amperage easily on the front display before striking the arc.

Precision Pulse TIG Welding

• Fully adjustable pulse frequency from 1 Hz to 200 Hz for enhanced control of heat input and bead appearance.

• Low-frequency pulsing (1 Hz) allows controlled filler-wire “dabbing,” ideal for the classic herringbone TIG weld finish.

• High-frequency pulsing (up to 200 Hz) reduces the heat-affected zone and improves arc focus for thin materials.

• Independent peak and base current adjustment provides maximum flexibility and precision in all welding positions.

Unique AC/DC Balance & Frequency Control

• Continuous AC/DC balance adjustment – from full DC- to full DC+, covering all AC variations for unmatched versatility.

• Extended balance range enables welding of a wider variety of materials than typical 220 A/270 A machines.

• AC- balance (80–90%) maximises heat input, perfect for heavy aluminium castings, alloy wheels, and thick plate.

• AC+ balance increases cleaning action and minimises heat input, ideal for exotic alloys and aerospace components.

• Adjustable AC frequency (20–200 Hz) – lower frequencies create a soft, wide arc for thick materials, while higher frequencies produce a tight, focused arc for fine sheet work.

Smooth, Quiet & Reliable Performance

• Instant arc starts on both AC and DC modes with no delay.

• Advanced square-wave technology ensures stable arcs and exceptionally quiet operation compared with standard AC TIG machines.

• Super-smooth DC welding throughout the range – silent, stable, and highly controllable.

• Built for long service life with Oxford’s renowned durability and low-maintenance design

Key Features

Precision control of weld power from 5A to 220A/270A.
✓ Digital display shows set values & precise welding values.
✓ TIG 2T/4T torch trigger normal/latch function.
✓ AC/DC infinite balance control, totally unique to our machines
✓ Advanced AC square wave gives superior weld performance.
✓ Ultra low AC arc noise thanks to advanced square wave.
✓ AC frequency control from 20Hz to 200Hz.
✓ Slope up & down controls.
✓ Gas pre-flow circuit built in & adjustable post-flow gas.
✓ Pulser controls with extended frequency range.
✓ Remote socket for foot pedal or other remote amps control.
✓ MMA welding of all rods including cellulosics on DC & AC.
✓ Generator friendly & compensation for cables up to 100M.
✓ Protection from over/under input volts, over temp.
✓ High efficiency & 20W standby power = low running costs.
✓ High duty cycles to keep you welding all day long.
✓ Rugged case design - drop tests exceed IEC60974-14
✓ Cooling chamber keeps dirty airflow away from electronic parts.
✓ Low weight & compact size for great portability.
✓ Industrial machines built to work hard for 25+ years.

Supply Voltage  230V
 

Size app  230W x 510L x 400H

Despite the simplicity of these models we have included many unseen features to benefit welding & operation including.
Auto shut down of gas & power if TIG output energised for too long without welding, fan on demand circuit – only runs as needed to
minimise noise & wear, output resets to off during slope down if arc is interrupted, upslope time only starts after arc starts. Also for
enhanced safety the output power is always off at switch on until the torch switch is pressed or MMA selected.
Build quality & design – We design & build all our own PCBs, transformers, coils, power assemblies etc. There are NO
microprocessors or programable technology used, GUARANTEED no software to corrupt! Built using our rugged 2 IGBT power
module technology & simple electronics – minimum parts & maximum reliability! Our reliability is the very best, no matter if
welding all day in production or storing in a barn for years for occasional jobs.
From a serviceability point our inverter machines are simple, no need for an Electronics degree! We include diagnostic LEDs & test
points. All OXFORD machines can be maintained by any competent Technician anywhere in the world.

Comes complete with WP26 12ft Tig torch, regulator and flowmeter.

OPERATORS MANUAL

Please call for a great deal !

All models built in compliance with with BS IEC60974-1, EU2019/1784, wee registered & CE marked.
All ratings above are based on TIG welding, when using on MMA duty cycles reduce by 6% & input power increases.

Every Oxford welding machine is offered with the following unbeatable guarantees:
2 year main components warranty.
5 year main transformer warranty (the heart of the machine)
20 year minimum guarantee of spares availability.
100% British made quality built to last!