Global Launch: ARC-350H Ultra-Compact 350A Three-Phase Industrial Welder
The world's lightest 350A industrial inverter – fits where no welder has gone before.
One Machine – Anywhere on Earth
10.5kg. 340×190×330mm. 70% duty cycle at 350A in 40°C ambient. Autovoltage 160–450V (1-phase / 2-phase / 3-phase auto-sensing).
Whether you're welding on an offshore platform in the North Sea, repairing mining equipment in the Australian outback, fabricating structural steel in Dubai, or maintaining ships in Singapore — the ARC-350H is built for you.
It's the most portable, rugged, and versatile industrial welder in its class.
The Company Behind the Machine
KEYGREE GROUP CO., LTD. — 700,000 units annual production | CE, ISO 9001, BSCI, FCCA certified | CNAS in progress | 40+ export markets
We don't just build welders — we engineer solutions for the world's toughest welding challenges.
⚡ Key Selling Points – ARC-350H
|
Feature |
Description |
|
Auto-Voltage 160–450V |
Automatically detects single-phase, two-phase, or three-phase input – works anywhere in the world |
|
MMA / Lift TIG |
Dual process capability – structural welding and precision TIG repairs in one machine |
|
Arc Force Adjustable |
Control digging action for different electrodes – optimize for 6010, 7018, and more |
|
Hot Start |
Automatic current boost at arc start – easy ignition on cold or rusty material |
|
Anti-Stick |
Automatically reduces current if electrode sticks – saves electrodes, reduces frustration |
|
Generator Compatible |
Optimised for generator power – stable arc on portable generators |
|
VRD ON/OFF |
Voltage Reduction Device – switchable for safety or high OCV requirements |
|
2-Layer Multi-Board Design |
Robust thermal management – durability in continuous operation |
|
Wired Remote Control (Optional) |
Adjust current from up to 50m away |
Smaller Than Any Industrial Welder You've Seen
|
Dimension |
Measurement |
What It Means On Site |
|
Height |
330 mm |
Fits under low decks, inside equipment cabinets |
|
Width |
190 mm |
Narrow enough to carry through 300mm manways |
|
Depth |
340 mm |
Short depth – doesn't block walkways |
|
Volume |
21.3 liters |
Smaller than a standard tool box |
|
Weight |
10.5 kg |
Onehand carry – no crane, no trolley, no assistant |
Carry it anywhere. Weld anything.
Specifications — Outperforming the Industry Standard
|
Feature |
KEYGREE ARC-350H |
Typical 350A Class Welder |
|
Dimensions |
340×190×330 mm |
~500×200×400 mm |
|
Weight |
10.5 kg |
~18–22 kg |
|
Input Power |
Auto-sensing 160–450V (1/2/3-phase) |
230/400V selectable |
|
MMA Start Current |
20 A |
~20 A |
|
Lift TIG Start Current |
10 A |
~10 A |
|
Duty Cycle @ 350A / 40°C |
70% |
~40–60% |
|
Duty Cycle @ 300A / 40°C |
100% |
~60–80% |
|
Arc Force Control |
✅ Adjustable |
✅ Adjustable |
|
Hot Start |
✅ Adjustable |
✅ Adjustable |
|
Anti-Stick |
✅ Yes |
✅ Yes |
|
VRD |
✅ ON/OFF switchable |
✅ Available |
|
Generator Compatibility |
✅ Excellent – wide voltage tolerance |
✅ Good (with PFC) |
|
Protections |
Over/Under voltage, Overcurrent, Thermal |
Thermal, IP23 |
|
Remote Control |
Optional wired remote |
Optional |
|
Construction |
2-layer multi-board – robust thermal management |
Industrial design |
|
Price Position |
High value |
Premium |
Comparison based on published specifications of leading brands in the 350A class.
Global Success Stories – Real-World Applications
Offshore North Sea (Norway)
Customer: Major oil platform maintenance contractor
Challenge: Welding in tight module compartments, frequent moves between decks, saline atmosphere.
Result: The 10.5kg ARC-350H is carried up ladders and through 300mm hatches. IP23 rating withstands salt spray. VRD ensures safety during simultaneous operations. "We cut setup time by 40%."
Structural Steel – Dubai (UAE)
Customer: Highrise construction fabricator
Challenge: Continuous welding on rebar and structural steel in 45°C heat. Generator power fluctuations on site.
Result: 70% duty cycle at 350A handles the heat; autovoltage 160–450V stabilises arc on generators. "No thermal shutdown, even during summer."
Mining Repairs – Minas Gerais (Brazil)
Customer: Openpit mine maintenance team
Challenge: Onsite repairs of haul truck buckets and crushers in remote location. Dust, humidity, and voltage drops.
Result: 2layer multiboard construction survives harsh conditions. Lift TIG with 10A start used for precision hardfacing. "One machine replaced our old 30kg transformer."
Shipbuilding – Batam (Indonesia)
Customer: Mediumsized shipyard
Challenge: Building and repairing vessels in covered docks. Confined spaces, high humidity, and threephase supply.
Result: Compact size allows welders to move easily between sections. 20A MMA start gives strong arc on rusty plates. "Throughput increased by 25%."
Pipeline Construction – Alberta (Canada)
Customer: Crosscountry pipeline contractor
Challenge: Winter welding at -30°C, generator power, and need for high opencircuit voltage for cellulosic electrodes.
Result: Machine starts reliably in extreme cold. VRD switchable for pipeline mode (high OCV). "Performs like a much larger machine."
Mining & Industrial – South Africa
Customer: Platinum mine maintenance workshop
Challenge: Repairing heavy earthmoving equipment in dusty conditions with unstable grid power.
Result: Auto-voltage feature handles grid fluctuations; dust-proof design ensures reliability. *"Our welders fight over who gets to use the ARC-350H."*
Structural Fabrication – Texas, USA
Customer: Steel fabrication shop for commercial construction
Challenge: Moving between workstations, need for reliable three-phase performance.
Result: Lightweight design allows welders to move machine to the workpiece. 100% duty cycle at 300A enables continuous production. "Increased shop floor efficiency by 30%."
Built for Any Climate – From Arctic to Desert
|
Condition |
ARC-350H Capability |
|
Arctic winter – cold starts |
Industrial components rated for -30°C operation |
|
Desert summer – 45°C+ heat |
70% duty cycle @ 350A – no thermal shutdown |
|
Tropical humidity – rain |
IP23 rated – dust and water jets protected |
|
Remote sites – unstable power |
Auto-voltage 160–450V – stable arc on any supply |
|
High altitude – thin air |
Efficient cooling design – full output up to 3000m |
One machine. Unlimited applications. Reliable anywhere.
Full Features – Engineered for Professionals
|
Feature |
Description |
Benefit |
|
DC Inverter Technology |
Advanced IGBT inverter design |
Energy-efficient, stable arc, lightweight |
|
Auto-Voltage 160–450V |
Automatically detects 1-phase, 2-phase, or 3-phase input |
Works anywhere – no manual linking, no rewiring |
|
MMA / Lift TIG |
Dual process capability |
One machine for structural welding and precision TIG repairs |
|
Arc Force Adjustable |
Control digging action for different electrodes |
Optimise arc characteristics for 6010, 7018, and more |
|
Hot Start Adjustable |
Automatic current boost at arc start |
Easy ignition – even on cold or rusty material |
|
Anti-Stick |
Automatically reduces current if electrode sticks |
Saves electrodes, reduces frustration |
|
VRD ON/OFF |
Voltage Reduction Device – switchable |
Safety on site; switch off when high OCV needed |
|
Generator Compatible |
Optimised for generator power |
Stable arc on portable generators |
|
2-Layer Multi-Board Design |
Robust thermal management |
Durability in continuous operation |
|
Protections |
Overvoltage, Undervoltage, Overcurrent, Thermal |
Machine safety in unstable conditions |
|
Wired Remote Control |
Optional accessory |
Adjust current from up to 50m away |
Full Technical Specifications
|
Parameter |
Value |
|
Dimensions (L×W×H) |
340 × 190 × 330 mm |
|
Volume |
21.3 liters |
|
Weight |
10.5 kg |
|
Processes |
MMA (Stick), Lift TIG (DC) |
|
MMA Start Current |
20 A |
|
Lift TIG Start Current |
10 A |
|
Current Range (MMA) |
20–350 A |
|
Current Range (TIG) |
10–350 A |
|
Duty Cycle @ 350 A / 40°C |
70% |
|
Duty Cycle @ 300 A / 40°C |
100% |
|
Input Voltage |
160–450 V – 1-phase/2-phase/3-phase auto-sensing |
|
Generator Requirement |
≥10 kVA recommended |
|
Arc Force |
Adjustable |
|
Hot Start |
Adjustable |
|
Anti-Stick |
✅ Yes |
|
VRD |
ON/OFF switchable |
|
Remote Control |
Optional (wired) |
|
Protections |
Overvoltage, Undervoltage, Overcurrent, Thermal |
|
Enclosure Rating |
IP23 |
|
Construction |
2-layer multi-board |
|
Standards |
EN 60974-1, ISO 9001 |
✅ Global Certifications & Quality Assurance
|
Certification |
Scope |
Status |
|
CE |
European Union (EMC, LVD, RoHS) |
✅ Certified |
|
ISO 9001:2015 |
Quality management system |
✅ Certified |
|
BSCI |
Business Social Compliance Initiative |
✅ Certified |
|
FCCA |
Foreign Commercial Customer Audits |
✅ Compliant |
|
CNAS |
China National Accreditation Service |
🔄 In Progress |
Annual Production Capacity: 700,000 units – ensuring consistent quality, reliable supply, and competitive pricing for global partners.
All machines are factory tested with full traceability.
Global Service & Support Scope
We don't just ship machines – we build partnerships.
Our service coverage includes:
|
Service |
Details |
|
Technical Documentation |
Multi-language manuals (English, Spanish, French, Russian, Arabic) |
|
Spare Parts |
Global parts network with express logistics |
|
Technical Support |
Remote troubleshooting by experienced engineers |
|
Training |
On-site training for distributors and key accounts |
|
Warranty |
Comprehensive warranty with local partners in 40+ countries |
|
OEM/ODM |
Private labelling and customisation for volume partners |
|
Certification Support |
Assistance with local market certifications |
Regional service hubs: Asia Pacific, Middle East, Africa, Europe, Latin America
Why Global Partners Choose KEYGREE ARC-350H
● Direct alternative to premium brands– comparable arc quality, half the size, significantly lighter, better duty cycle
● True three-phase industrial performance– smoother arc, higher efficiency than single-phase machines
● Auto-voltage 160–450V (1/2/3-phase)– works anywhere in the world
● CE / ISO / BSCI / FCCA certified– quality and compliance guaranteed
● 700,000 units annual capacity– reliable supply for global distributors
● Generator-ready + VRD– perfect for site and shop
● Built for harsh conditions– tested from -30°C to +50°C
● Full OEM/ODM support– private labelling available
● Fast global shipping– from Wenzhou, China
● Model: KEYGREE ARC-350H
Ultra-Compact 350A Three-Phase Industrial Inverter
Ready to Redefine Industrial Portability?
We offer:
✅ Full technical datasheet — certified duty cycle curves (EN 60974-1)
✅ CE / ISO / BSCI / FCCA certification documents
✅ Weld test videos — 6010 root pass, 7018 fill, Lift TIG stainless
✅ Side-by-side size comparison with leading 350A class machines
✅ Multi-language user manuals
✅ Global distributor pricing
✅ Sample units for qualified partners
✅ OEM/ODM consultation
Website: www.keygree.com
*Duty cycle certified per EN 60974-1 at 40°C ambient. Specifications subject to change without notice. Certifications may vary by model and destination.*