IWAVE 400I AC/DC WATERCOOLED TIG INVERTER
FRONIUS iWAVE 400i AC/DC
Multiprocess PRO TIG AC/DC Inverter Power Source
The Fronius iWave 400i AC/DC sits within the Multiprocess PRO tier of the iWave range (300iā500i), delivering up to 400A of fully digitised, microprocessor-controlled power as a genuine combined welding system. Rather than being locked to TIG alone, the 400i AC/DC can be configured to cover TIG (including HF), MIG/MAG, and MMA ā including cellulose electrode welding ā all from the one power source, with no compromise on weld quality across any of them.
At its core, the 400i AC/DC carries the same intelligent technology found across the iWave range: RPI Auto ignition, which automatically adjusts ignition settings for electrode diameter and condition to cut ignition delay by up to 71%, and targeted heat input control for maximum control over the weld pool.
Key Features
| Feature | Detail |
|---|---|
| Welding processes | TIG AC/DC (incl. HF), Manual (Stick/MMA) electrode including cellulose (CEL) ā MIG/MAG available via Multiprocess PRO upgrade |
| Output | Up to 400A |
| Ignition | RPI Auto intelligent ignition ā up to 71% less ignition delay |
| Multiprocess capability | Multiprocess PRO ā unlock MIG/MAG welding packages (Standard, Pulse, PMC, LSC, CMT) on the same power source |
| Display | 4.3" colour plain-text display, dynamic graphics-based menu navigation in 30+ languages |
| Connectivity | Bluetooth, Wi-Fi (WLAN) and NFC ā Industry 4.0 ready with contactless data transfer and authentication |
| Weld pool control | Targeted heat input for maximum control over the weld pool |
| Mains voltage | 3 x 400V (standard) |
| Generator compatibility | Fully generator-compatible |
Multiprocess PRO ā One Power Source, Every Process
The iWave 400i AC/DC is part of Fronius' Multiprocess PRO tier, meaning it can cover TIG, MIG/MAG and MMA welding from a single machine. Unlocking full MIG/MAG capability is a straightforward three-step process:
- Unlock ā order the OPT/i Multiprocess PRO hardware option
- Expand ā add the necessary MIG/MAG hardware, such as an external wire feeder and welding torch(es)
- Configure ā select the MIG/MAG Welding Packages needed: Standard, Pulse, PMC, LSC or CMT
| Welding Package | What it offers |
|---|---|
| Standard | Dip transfer and spray arcs across the full power range for unalloyed, low- and high-alloy materials |
| Pulse | Reduced spatter with a variable working range from light to heavy gauge sheet |
| LSC (Low Spatter Control) | High arc stability with reduced spatter in the dip transfer arc, plus a penetration stabiliser for constant penetration in the spray arc |
| PMC (Pulse Multi Control) | Improved weld seam quality and higher welding speeds via integrated penetration and arc length stabilisers |
| CMT (Cold Metal Transfer) | Minimised heat input through precise droplet detachment and reduced spatter via reversing wire electrode movement |
This means a workshop that primarily runs TIG today isn't locked out of adding MIG/MAG capability down the track ā the 400i AC/DC is built to expand with the work rather than be replaced by it.
Why Choose the iWave 400i AC/DC?
One system instead of two. For workshops that switch between TIG and MIG/MAG on the same components ā a common pain point where space and setup time for two separate machines becomes inefficient ā the 400i AC/DC removes the need to run and maintain multiple systems.
Faster, more reliable ignition. RPI Auto removes the guesswork from TIG ignition settings, delivering consistent, reproducible arc starts regardless of electrode condition or material.
Confident on aluminium and steel alike. AC/DC output, combined with targeted heat input control, makes the 400i AC/DC well suited to aluminium, aluminium alloys and magnesium as well as steel and stainless.
Genuinely future-proof. The modular Multiprocess PRO architecture and Industry 4.0-ready connectivity mean the machine can be expanded and integrated into digital production environments as requirements grow.
Intuitive to operate. A 4.3" colour display with dynamic, graphics-based menu navigation in over 30 languages keeps parameters accessible and easy to adjust, even with gloves on.
Frequently Asked Questions
What welding processes does the iWave 400i AC/DC support? TIG AC/DC (including HF) and manual (stick/MMA) electrode, including cellulose electrodes, come standard. MIG/MAG process variants (Standard, Pulse, PMC, LSC, CMT) can be added via the Multiprocess PRO upgrade.
What is Multiprocess PRO? Multiprocess PRO is Fronius' modular system (available on iWave 300iā500i) that allows a single power source to be expanded from TIG-only into a combined TIG, MIG/MAG and MMA welding system, by adding the OPT/i Multiprocess PRO hardware option, the necessary MIG/MAG hardware, and selecting a Welding Package.
What is RPI Auto? RPI Auto is Fronius' intelligent ignition function, automatically adjusting ignition parameters based on electrode diameter and condition to deliver fast, reproducible arc starts ā reducing ignition delay by up to 71% compared to running without it.
Can the iWave 400i AC/DC weld aluminium? Yes ā the AC/DC output and targeted heat input control make it well suited to aluminium, aluminium alloys and magnesium, alongside steel and stainless.
Is the iWave 400i AC/DC gas or water cooled? Both configurations are available. Talk to the QWS team about which cooling option and package suits your application.
How does the iWave 400i AC/DC compare to the iWave 300i AC/DC? Both sit within the Multiprocess PRO tier with the same core technology (RPI Auto, connectivity, modular MIG/MAG packages), with the 400i offering higher maximum output (400A vs 300A) for heavier-duty applications.