Press release
TIGMASTER-250COLD: The World's Most Portable 250A Pulse TIG/MMA Welder
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.
Why TIGMASTER-250COLD(https://www.keygree.com/tigmaster-250c0ld-tigmaster-315cold-product/)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 (5-pin) 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%, 1-phase
Generator Requirement ≥8 kVA recommended
Pulse Frequency 0.1-500 Hz
Pulse Duty Cycle 10-90%
Slope Up / Down 0-25 s
Pre-Gas / Post-Gas 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 5-pin (wired remote / foot pedal)
Cooling Intelligent fan - on-demand
VRD ON/OFF switchable
Protections Overvoltage, Undervoltage, Overcurrent, Thermal
Enclosure Rating IP23
Standards EN 60974-1, 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 Studies
Precision 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: Fracture 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 fracturerepairs
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 workforce
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 datasheet with pulse curves and duty cycle certification
Weld test videos (5 A start, pulse modes, spot welding)
Distributor pricing for 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.*
Branch 1:Yueqing City,Wenzhou City,Zhejiang,China(Wenzhou KeyGree Electric Co., Ltd. )
Branch 2:Qingbaijiang Industrial Zone,Chengdu,Sichuan,China(Chengdu KeyGree Technology Co., Ltd.)
KeyGree Focus on welding machine and Automatic solution: Cobot, industrial robot system, laser welding/cutting machine ,etc.
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