EWM TIG 450 AC/DC is an inverter TIG power source for alternating and direct current, with an MMA mode. With direct current you weld from 5 to 450 A, with alternating current from 7 to 450 A. At a 60% duty cycle the machine gives 450 A, and it pulls 350 A without a break, the supply is 3 x 400 V.
What this machine is for
This is a source for tasks in heavy industry, in power engineering and in the building of tanks and pipelines. With alternating current you join thick aluminium parts, because the positive phase breaks the oxide layer on the pool. With direct current you take acid resistant and high alloy steels, where a clean weld without overheating counts.
A current of 350 A in a 100% duty cycle sets the machine up for multi shift work and long beads, and the upper 450 A at a 60% duty cycle is left for the thickest sections. The range from 5 A on direct current gives access to thin sheet and to root runs, so one station handles both a small part and a heavy section.
The panel runs the full welding path: you set the current slope up, the gas post flow time and the crater filling at the end of the weld. The cables in the set are long, the torch is 8 m and the supply cable 10 m, so the source stays in one place and you walk around a large part.
Features and equipment
- Adjustment of the ignition time with the positive half of the alternating current, with which you control the heating of the material right at the start. It makes ignition on dirty aluminium easier and saves the tungsten electrode.
- Adjustment of the alternating current balance, that is of the split between oxide cleaning and penetration.
- Adjustment of the alternating current frequency from 50 to 200 Hz. A higher frequency narrows the arc and gives deeper penetration in narrow gaps and on thick aluminium plate.
- A full welding path with settings of the current slope up, the gas times and the crater, shown graphically on the panel.
- MMA mode for a covered electrode and a change of polarity to plus and to minus.
- Liquid cooled TIG torch, needed at currents of the order of 450 A.
Technical data
| Brand | EWM |
|---|---|
| Current type | AC/DC |
| Supply voltage | 3 x 400 V |
| Mains fuse | 35 A |
| DC welding current range | from 5 to 450 A |
| AC welding current range | from 7 to 450 A |
| Duty cycle at a temperature of 40 degrees | 450 A at 60%, 350 A at 100% |
| Power factor cos fi | 0.90 |
| Alternating current frequency | from 50 to 200 Hz |
| Cooling | liquid |
| TIG torch | 8 m, load capacity 450 A |
| Supply cable | 10 m |
| Earth cable | 5 m |
What you get
- EWM TIG 450 AC/DC inverter welder
- TIG torch 450 A liquid cooled, 8 m
- supply cable 10 m
- earth cable 5 m
What to watch out for
The supply is 3 x 400 V with a 35 A fuse, so check the connection and the cable section before you set up the station. The power factor of 0.90 says how the machine loads the mains at full current. The torch is liquid cooled, so you need a cooler, fluid and a clear circuit, because work without flow destroys the handle.
The duty cycle at a temperature of 40 degrees is 450 A at 60% and 350 A at 100%. For matching to production take the lower value, because that one sets the pace without breaks. The cables are long, the torch 8 m and the supply 10 m, so watch how they are routed, so that they do not lie on hot parts and in the path of trolleys.
How we sell used machines
This unit was checked in our service workshop in Krotoszyn with measurements to PN-EN 60974-4 and a load test. The price includes the first year of the basic service package: an inspection with cleaning of the machine and a validation measurement. Further years can be added. We ship across the European Union, collection in person by appointment.
