(Isstories Editorial):- Wenzhou, Zhejiang Apr 15, 2026 (Issuewire.com) – 9.5kg | 100% Duty Cycle @ 250A / 40°C | 5A TIG Start | 0.1-500Hz Pulse | 2T/4T/S4T/SPOT Modes Built by KEYGREE – 700,000 Units/Year of Welding Equipment
KEYGREE GROUP CO., LTD. produces 700,000 sets of welding equipment annually, trusted by professionals in over 100 countries — from European fabrication shops to Middle Eastern pipeline contractors, from Southeast Asian shipyards to African mines.
Certified Quality: CE, ISO 9001, BSCI, FCCA (CNAS pending) — your guarantee of safety, reliability, and ethical production.
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Why TIGMASTER-250COLD Sets a New Standard
Feature
TIGMASTER-250COLD
Typical 250A Class Welder
Weight
9.5 kg – truly portable
12-15 kg
TIG Start Current
5 A – ultra-clean arc initiation
~8 A
MMA Start Current
10 A – smoot
h ignition for 6010/7018
~10 A
Duty Cycle @ 250 A / 40°C
100% – weld all day non-stop
35-60% @ 220-250 A
Pulse Frequency
0.1-500 Hz – from soft ripples to stiff arc
Typically up to 200 Hz
Pulse Duty Cycle
10-90% adjustable
Fixed or limited range
Slope Up/Down
0-25 s adjustable
Often fixed or narrow
Cold Welding Time
1-500 ms
Not available on many models
Spot Welding
0.1-9.99 s + interval
Basic timer only
Torch Modes
2T / 4T / S4T / SPOT
Usually 2T/4T only
Remote Control
Standard (5pin)
Optional accessory
Cooling System
Intelligent fan – runs only when needed
Continuous or basic thermal
Generator Compatibility
… Excellent – wide voltage tolerance
… Good (PFC)
VRD
… ON/OFF switchable
… Available
Price Position
High value
Premium
*Comparison based on published specifications of leading brands in the 250A DC TIG/MMA class.
Full Technical Specifications
Parameter
Value
Processes
DC TIG (Lift), MMA (Stick)
Model
TIGMASTER-250COLD
Weight
9.5kg
TIG Start Current
5 A
MMA Start Current
10 A
Current Range
5-250 A (TIG), 10-250 A (MMA)
Duty Cycle @ 250 A / 40°C
100%
Input Power
220 V ±15%, 1phase
Generator Requirement
8 kVA recommended
Pulse Frequency
0.1-500 Hz
Pulse Duty Cycle
10-90%
Slope Up / Down
0-25 s
PreGas / PostGas
0-25 s / 1-25 s
Cold Welding Time
1-500 ms
Spot Welding Time
0.1-9.99 s
Spot Interval
0.1-9.99 s
Torch Modes
2T / 4T / S4T / SPOT
Remote Connector
5pin (wired remote / foot pedal)
Cooling
Intelligent fan – ondemand
VRD
ON/OFF switchable
Protections
Overvoltage, Undervoltage, Overcurrent, Thermal
Enclosure Rating
IP23
Standards
EN 609741, ISO 9001
Certifications
CE, ISO 9001, BSCI, FCCA (CNAS in process)
Global Service & Support
Wherever you are, KEYGREE ensures you stay productive:
- Worldwide Distributor Network– Spare parts and service in over 50 countries
- 24/7 Technical Support– English, Spanish, Arabic, Russian, French
- 2-Year Warranty– Standard on all TIGMASTER series
- Fast Logistics– Air, sea, and rail options with tracking
- Online Training– Video manuals, webinars, and on-site training available
- Generator-Ready– Stable performance even in remote sites with unstable power
Global Application Case StudiesPrecision Fabrication – Germany
Challenge: TIG welding 0.8mm stainless steel for high-end automotive components required ultra-clean starts and precise heat management.
Solution: TIGMASTER-250COLD with 5A TIG start, 0.1-500Hz pulse control, and intelligent cooling.
Result:
- 30% equipment cost savings compared to previous premium brand
- Cleaner starts eliminated post-weld cleanup on thin sheet
- Finer pulse control enabled heat management for distortion-free welds
- Now standard equipment across their precision fabrication line
Pipeline Construction – UAE
Challenge: On-site pipeline welding in 45°C ambient temperatures required equipment that could withstand heat and be easily transported.
Solution: TIGMASTER-250COLD with 100% duty cycle, 9.5kg portability, remote control, and switchable VRD.
Result:
- 20 units deployed across major oil & gas projects
- Zero thermal shutdowns despite 45°C+ ambient temperatures
- One technician can carry and operate — reduced crew size by 2 per site
- VRD enabled safe multi-crew operations in confined spaces
Mining Maintenance – South Africa
Challenge: Crack repair on heavy mining equipment required precision welding without distortion; harsh, dusty environment demanded reliable equipment.
Solution: TIGMASTER-250COLD with cold welding (1-500ms), spot welding with adjustable interval, and intelligent cooling.
Result:
- Cold welding mode eliminated distortion on crack repairs
- Intelligent cooling reduced dust ingestion — extended equipment life by 40%
- Repair time reduced by 35% with quick spot tacking
- Now standard across 3 mine sites
Shipbuilding – Indonesia
Challenge: Aluminum TIG welding on passenger ferries required focused arc control and equipment that could operate on generator power in a tropical shipyard.
Solution: TIGMASTER-250COLD with 500Hz pulse frequency, S4T mode, and generator compatibility.
Result:
- Replaced bulky machines — freed up workshop space by 30%
- S4T mode reduced operator fatigue on long hull seams
- Generator-friendly operation on 10kVA diesel genset — no grid power needed
- Fleet expanded to 15 units across 2 shipyards
Agricultural Equipment Manufacturing – Brazil
Challenge: Mixed production of carbon steel and stainless steel components required quick process switching and export compliance.
Solution: TIGMASTER-250COLD with TIG/MMA dual-process capability, adjustable post-gas up to 25s, and CE certification.
Result:
- Quick switch between TIG and MMA — reduced changeover time by 80%
- 25s post-gas enabled titanium welding for specialized components
- CE certified — hassle-free export to EU markets
- Production capacity increased by 25% with same wrkforce
Why Global Professionals Choose TIGMASTER-250COLD
- Ultra-portable + full duty cycle — 9.5kg with 100% duty cycle at 250A — no compromises
- Precision control — 5A start, 0.1-500Hz pulse, 10-90% pulse duty cycle — finer adjustment than class leaders
- Advanced torch modes — S4T for automated slope, SPOT for production tacking
- Intelligent cooling — runs only when needed — cleaner, quieter, longer life
- Global support network — parts and service in over 50 countries
- Private labeling available for volume partners
Ready to Elevate Your Welding Capability?
Contact us today for:
- Free sample testing– we’ll ship a unit to qualified partners
- Detailed datasheetwith pulse curves and duty cycle certification
- Weld test videos(5 A start, pulse modes, spot welding)
- Distributor pricingfor global markets
- OEM/ODM collaboration
Contact KEYGREE: www.keygree.com | Response within 24 hours
*Specifications subject to change without notice. TIGMASTER is a trademark of KEYGREE GROUP CO., LTD. Third-party test reports available upon request.*
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