400A arc welding machine · 415 V three phase · digital inverter
400 A of Clean DC Arc. Every Electrode up to 5 mm.
The CRUXWELD ARC400iS is a 400A arc welding machine built for structural fabrication, site erection and heavy repair. A 415 V three-phase digital inverter runs 2.5 to 5 mm electrodes — rutile, low-hydrogen 7018 and cellulosic 6010 — with hot start, arc force and anti-stick set from two knobs on the front panel. Compact enough for one person to carry to the joint, and at 85% efficiency it draws a fraction of what a 400 A rectifier does. Engineered, assembled and tested in India by a GeM Registered OEM Manufacturer.
The 400A Arc Welding Machine for Structural and Site Work
A 400 A class is where stick welding gets serious: 5 mm electrodes on thick plate, root runs with 6010 on pipe, and shifts that run all day. The ARC400iS 400A arc welding machine delivers a full 400 A from a 14 kVA three-phase supply, in a portable inverter case instead of a transformer-rectifier that needs a trolley.
It is a digital inverter: the control board watches arc voltage and current thousands of times a second and corrects them before the welder can see a change. The result is an arc that stays stable on long leads, on weak site supplies and on generators, with hot start to light the rod, arc force to push through the puddle on a vertical-up, and anti-stick to release a frozen electrode without burning the holder.
Full 400 A output
20–400 A stepless: a machine that keeps up with a welder on 5 mm rods all shift.
6010 cellulosic ready
85 V open-circuit voltage and fast arc-force response light and hold cellulosic electrodes for pipe root runs.
415 V ±20%
Three-phase input with wide tolerance; works on site boards, long cables and 20 kVA generators.
Portable, two handles
Carried by one person, lifted into a cage, moved joint to joint.
ARC400iS: 400 A three-phase digital inverter.
What you are looking at
Panel, Knobs, Connections
1Digital front panel
Three-digit ammeter shows preset and actual current. Power LED, protection LED, and two knobs: welding current and arc force.
2Heavy-duty output sockets
Brass 50 mm² quick connectors on the lower panel with polarity marked: electrode holder to +, earth to − for 7018; swap for DCEN.
3Holder and earth clamp
400 A electrode holder and 400 A earth clamp on 35 mm² copper cable, supplied with the machine.
The 400A arc welding machine is housed in a powder-coated steel enclosure with moulded corner guards, louvred side panels and twin top handles. Forced-air cooling, class H insulation, IP23S protection — it sits in an open yard in the rain and keeps working.
Set it right
Electrode and Current Guide for the ARC400iS
Set current, set arc force, strike.
Electrode
Typical current
Used for
2.5 mm
60 – 100 A
Thin section, tack welds, sheet 3 mm
3.2 mm
100 – 150 A
General fabrication, 5–8 mm plate
4.0 mm
150 – 220 A
Structural steel, fillets 6 mm+
5.0 mm
200 – 300 A
Heavy sections, multi-pass, 12 mm+
6010 (3.2 – 4 mm)
90 – 170 A
Pipe root runs, vertical-down
Typical ranges for DC welding; follow the electrode manufacturer’s box for the exact setting. With 20–400 A on the dial the 400A arc welding machine covers every one of them with headroom.
Why fabricators choose it
What a Digital Inverter Changes at 400 A
Smooth, stable arc
Digital control corrects the arc thousands of times a second; spatter drops and the bead stays even on long leads.
Hot start & arc force
Extra current at strike so the rod lights first time; adjustable arc force so the puddle does not freeze on vertical-up.
Anti-stick
If the rod freezes the current cuts in milliseconds; break it off and carry on without a glowing holder.
Runs on generators
Wide input tolerance and soft start: a 20 kVA genset powers the 400A arc welding machine on remote sites.
85% efficiency
Far lower electricity bill than a 400 A rectifier; power factor stays high at full output.
Protected four ways
Over-voltage, under-voltage, overload and single-phasing protection with LED warning; the inverter shuts down before damage.
Key features
The ARC400iS, Point by Point
20–400 A stepless
Full 400 A output, 34 V rated output, 85 V OCV.
Digital inverter, IGBT
High-frequency switching, microprocessor control, 14 kVA maximum input.
All electrode types
Rutile, basic low-hydrogen 7018, cellulosic 6010, stainless and hardfacing rods 2.5–5 mm.
Front-panel adjustment
Welding current and arc force knobs; digital ammeter; power and protection LEDs.
Site-proof build
Steel enclosure, moulded corner guards, IP23S, class H insulation, forced-air cooling.
Remote-lead friendly
Stable arc on 30 m of 35 mm² cable; no need to move the machine to every joint.
Two handles, portable
Lifted by one person, lowered by crane cage, carried up scaffolding.
Polarity in seconds
DCEP / DCEN by swapping the dinse plugs — no switch to fail.
Applications
Where the 400A Arc Welding Machine Earns Its Keep
Ready for the yard: holder, earth and 35 mm² cables.
For single-phase workshops see the ARC 250 and ARC 300; for two welders on one machine with gouging, the ARC630-2T. If you must have a transformer-rectifier, the Welding Rectifier 400 is still in the range.
Scope of supply
What Arrives with the ARC400iS
✓ARC400iS 400A arc welding machine, 415 V three phase
✓400 A electrode holder on 35 mm² welding cable
✓400 A earth clamp on 35 mm² cable
✓Three-phase input cable
✓Test certificate
Longer leads, a wheeled trolley and a hand shield are optional; the exact scope is confirmed on the quotation. See the full range on our products page.
Machine, holder, earth clamp: ready to weld.
Why buy from CRUXWELD
Engineered in India, Supported Worldwide
45+ years of welding expertise
The ARC400iS is engineered, assembled and load tested by CRUXWELD engineers in India; our technical team answers on WhatsApp.
ISO 9001:2015
Every ARC400iS is run at full load and weld tested before dispatch.
GeM Registered OEM Manufacturer
Tender-ready documentation for government, PSU and institutional buyers.
Pan-India supply, export ready
Dispatched across India and exported; holders, clamps and cables in stock.
Specifications are subject to improvement without notice; the quotation and test certificate supplied with the machine are the governing documents. Warranty terms are stated on the quotation / invoice.
What size of three-phase connection does a 400A arc welding machine need?
The ARC400iS draws a maximum of 14 kVA at full output, so a 415 V three-phase supply protected by a 32 A breaker is sufficient. For sites, a 20 kVA or larger diesel generator runs it comfortably.
Can the ARC400iS weld 5 mm electrodes continuously?
Yes. A 5 mm rod runs at 200–300 A, well inside the 400 A that the 400A arc welding machine delivers, with headroom for 6 mm hardfacing or gouging rods.
Does it weld cellulosic 6010 electrodes?
Yes. 85 V open-circuit voltage, hot start and a fast arc-force response are exactly what 6010 needs for pipe root runs. Set arc force high and use DCEP.
What is the difference between hot start and arc force?
Hot start adds current for a fraction of a second at the strike so the rod lights cleanly. Arc force adds current whenever the arc shortens, keeping the arc alive when you push the rod into the puddle on vertical or overhead welds.
How long a welding cable can I use?
The digital control compensates for cable drop, so 30 m of 35 mm² cable each way is normal practice. Use 50 mm² beyond that to keep full current at the holder.
Is the ARC400iS lighter than a welding rectifier?
Considerably. A 400 A transformer-rectifier needs a trolley; the ARC400iS 400A arc welding machine is an inverter one person carries by its two handles, and it uses roughly half the electricity for the same arc.
What is included with the machine?
The 400A arc welding machine, a 400 A electrode holder and earth clamp on 35 mm² cable, three-phase input cable and a test certificate. Longer leads and a trolley are optional.
How do I get the ARC400iS price and delivery time?
Request a quote on this page or message +91 88008 82983 on WhatsApp with your quantity and location. You will receive a GST quotation with delivery time, usually the same working day.
Tell us your electrodes and plate — we will confirm the fit and send a quotation today.
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I want complete set up for GTAW (Torch, Rectifier, Gas tubing, regulator, Metal (W) Electrode (1 pack) and other required accessories).
Quote for the PPEs saperately
Quantity (02 nos.)
Delivery to MP
Please provide FOR Rate
Cruxweld team thank you for the interest shown in our welding machine. We will get back to you.
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Can weld 5mm rod in single face continue 1 hours