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Thank you for selecting the R-Tech PRO-MIG250 Portable Inverter MIG/MAG/MMA 
Welder.   

 

 

 

The PRO-MIG250 has many benefits over traditional transformer MIG welders, 
including infinite power control, adjustable arc force and a durable metal wire feed 
mechanism to provide very smooth wire feed and weld characteristics   
 
We want you to take pride in operating our PRO-MIG250, as much as we have taken in 
making this product for you. Please read all information in this manual before 
operation 

 

  

 

PLEASE EXAMINE CARTON AND EQUIPMENT FOR DAMAGE IMMEDIATELY 

 

 

 

When this equipment is shipped, title passes to the purchaser upon receipt from the courier.  
Consequently all claims for material damaged in shipment must be made by purchaser 
against the transportation company used.  
  
Please record your welding equipment identification below for future reference. This 
information can be found on data plate at rear of machine.  

  

Product 

PRO-MIG250 

 

Serial No. ___________________________________  
  
Date of Purchase _____________________________  
  
Where Purchased _____________________________  
  
Whenever you request replacement parts or information on this equipment please supply the 
information you have recorded above  
  

This product is covered by 2 years parts and labour warranty, we will cover cost of collecting and 
returning item to you (UK mainland only, other areas are RTB). External items, torch, earth lead etc are 
covered by 3 months warranty. Any faults/damage found caused by customer will be charged pro-rata

 

 

 
  
Please read this operator manual completely before attempting to use this equipment.  
Pay particular attention to the safety instructions we have provided you for your protection  
  
The level of seriousness to be applied to each section is explained below  

 

 

WARNING 

 

  
This statement appears where the information must be followed exactly to avoid serious 
personal injury.  
  

CAUTION 

 

  
This statement appears where the information must be following to avoid a minor personal 
injury or damage to this equipment.  
  
  
                                         

 
 

Summary of Contents for PRO-MIG250

Page 1: ...www r techwelding co uk email sales r techwelding co uk Tel 01452 733933 Fax 01452 733939 PRO MIG250 PORTABLE INVERTER MIG MAG MMA WELDER OPERATING INSTRUCTIONS Version 2017 1...

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Page 3: ...of machine Product PRO MIG250 Serial No ___________________________________ Date of Purchase _____________________________ Where Purchased _____________________________ Whenever you request replacemen...

Page 4: ...MMA 200Amps Welding Capability Duty Cycle Equipment Limitations The R Tech PRO MIG250 is rated at 250 Amps at 35 and 200 Amps 60 duty cycle on a ten minute basis If the duty cycle is exceeded a therma...

Page 5: ...rticles towards the welder An abundance of conductive material can cause plant failure Stacking This machine cannot be stacked Transport Unloading Never underestimate the weight of equipment never mov...

Page 6: ...sible and enclose as much of them as possible in metal conduit or equivalent shielding There should be a good electrical contact between this conduit and ground Earth 2 Keep the work and electrode lea...

Page 7: ...a 240V 50 60Hz 1 Phase 22A supply It comes with a 2 metre mains cable attached Connect wires according to national coding Brown wire Live Blue wire Neutral Green Yellow Wire Earth Ground Connecting t...

Page 8: ...ic shock keep the MIG torch in good condition and replace if any of the insulation is damaged 3 Mains input cable Fit required plug as per legal requirements 4 Gas inlet connection Connect gas hose to...

Page 9: ...e has cooled down The light will go off and welding may be carried out again 6 Warning LED This warning light will come on under these situations to warn of either low input voltage has been sensed or...

Page 10: ...g causing unwanted Burn back into tips or erratic weld beads size 3 Wire Feed Drive Assembly Make sure rollers are correct size for wire diameter selected to change roller size release retaining screw...

Page 11: ...n be dangerous Keep your head out of fumes gases produced from welding Use ventilation or exhaust to remove fumes gases from breathing zone and general area WARNING WELDING SPARKS can cause fire or ex...

Page 12: ...her and stops it snarling at rollers To fit a Teflon liner remove steel liner from torch and fit Teflon liner so you have about 10 inches left coming out end of MIG torch at the machine end In the bra...

Page 13: ...ET 3 0 CARBON STEEL 0 6 A18 ARGON 5 CO2 3 5 6 98 LAP JOINT 1 0 CARBON STEEL 0 6 A18 ARGON 5 CO2 1 5 4 62 LAP JOINT 2 0 CARBON STEEL 0 6 A18 ARGON 5 CO2 3 5 84 LAP JOINT 3 0 CARBON STEEL 0 6 A18 ARGON...

Page 14: ...EL 0 8 A18 ARGON 5 CO2 6 5 8 5 165 LAP JOINT 4 0 CARBON STEEL 0 8 A18 ARGON 5 CO2 7 9 186 LAP JOINT 5 0 CARBON STEEL 0 8 A18 ARGON 5 CO2 8 9 5 209 LAP JOINT 6 0 CARBON STEEL 0 8 A18 ARGON 5 CO2 9 10 2...

Page 15: ...BON STEEL 1 0 A18 ARGON 5 CO2 6 6 182 LAP JOINT 5 0 CARBON STEEL 1 0 A18 ARGON 5 CO2 6 7 218 LAP JOINT 6 0 CARBON STEEL 1 0 A18 ARGON 5 CO2 6 5 9 230 LAP JOINT 8 0 CARBON STEEL 1 0 A18 ARGON 5 CO2 8 1...

Page 16: ...same time otherwise an electric shock will occur Maintenance Routine and periodic maintenance WARNING ELECTRIC SHOCK CAN KILL Turn the input power OFF at the mains switch fuse box and remove mains plu...

Page 17: ...ecure and torch switch operation try replacing MIG torch No output Power light is lit Warning light is lit Welding application may have exceeded recommended duty cycle allow machine to cool down until...

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