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Safety Precautions 

 

Read entire section before starting installation 

 

WARNING! 

 

 

Electric Shock can kill – Only qualified personnel should perform this installation. Turn off input 
power at the fuse box before working on this equipment.

  

Do not touch electrically live parts. Always 

connect the machine to an earthed mains supply as per national recommended standards. 

 
Select suitable location 
 

Place the welder where clean cooling air can freely circulate in and out of the front & rear louver 
vents. Dirt, dust or any foreign material that can be drawn through vents into welder must be kept to 
a minimum. Failure to observe these precautions can result in excessive operating temperatures 
which can lead to plant failure. 
 

Grinding 

 
Do not direct grinding particles 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 move or leave suspended in the air above 
people. Use recommended lifting equipment at all times. 

 

WARNING! 

 

Falling Equipment can cause injury. Never lift welder with gas bottle attached. Never lift above 
personnel. 

 

 

Tilting 
 

Machine must be placed on a secure level surface or on a recommended undercarriage/trolley. 
This machine may topple over if this procedure is not followed. 
 

Environmental Rating 
 

The welding power source carries the IP21S rating. It may be used in normal industrial and 
commercial environments. Avoid using in areas where water / rain is around. 
 
Read and follow the ‘Electric Shock Warnings’ in the safety section if welding must be performed 
under electrically hazardous conditions such as welding in wet areas or water on the work piece. 
 

Summary of Contents for TIG251

Page 1: ...www r techwelding co uk email sales r techwelding co uk Tel 01452 733933 Fax 01452 733939 TIG251 AC DC INVERTER TIG WELDER OPERATION INSTRUCTIONS Version 2014 1...

Page 2: ...2...

Page 3: ...on data plate at rear of machine Product TIG251 Serial No ___________________________________ Date of Purchase _____________________________ Where Purchased _____________________________ Whenever you...

Page 4: ...protected from overloads beyond the output ratings and duty cycle as per machine specifications with thermostat protection of the output coils and rectifiers Welding Capability Duty Cycle The R Tech...

Page 5: ...articles 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 mo...

Page 6: ...these contributing factors in mind installing equipment as per following instructions should minimize problems 1 Keep the welder input power lines as short as possible and enclose as much of them as...

Page 7: ...ot touch electrically live parts The TIG251 Inverter TIG Welder requires a 240V 50 60Hz supply It requires a 32A supply for TIG and MMA welding It comes with a 3 metre mains cable attached Connect wir...

Page 8: ...s etc 3 Fuse Holder 5A fuse for water cooling socket 4 Mains input cable Fit required plug as per your electrical installation 5 Gas input connector Connect input gas hose ensuring connection is tight...

Page 9: ...ting until tight 4 Torch control socket 7 Pin Connect torch control plug To avoid a High Frequency shock keep the TIG torch in good condition and replace if any of the insulation is damaged Connect th...

Page 10: ...ve power connector Connect the electrode holder by inserting and twisting until tight 2 Not used in MMA mode 3 Negative power connector Connect the earth lead to by inserting and twisting until tight...

Page 11: ...tment This sets pulse amperage and must be set above the base main current amperage If set to zero pulse welding is disabled 3 Pulse frequency adjustment This sets how often pulse will occur 0 5 25hz...

Page 12: ...machine will open gas valve to start flow of shield gas after a 0 5 seconds pre flow time to purge air from torch hose the welding output of machine will be turned on and the arc will be started Afte...

Page 13: ...machine will now decrease the welding output current to finish min in down slope time set Once at finish min output you can release the TIG torch switch to end weld the gas post flow will continue to...

Page 14: ...t more penetration and the machine will spend more time penetrating work negative part of cycle When welding dirty contaminated material more cleaning may need to be selected the machine will spend mo...

Page 15: ...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 16: ...setting 10 Adjust Pulse freq to desired setting 11 If welding on AC set AC Frequency to 100Hz and SP to 50 12 Press the TIG torch switch to start welding Notes When welding with Pulse the pulse ampera...

Page 17: ...re welding Tips for AC Welding The TIG251 offers two significant advantages over conventional silicon rectifier SCR transformer power sources 1 The AC square wave balance SP can be set to a higher per...

Page 18: ...SHOCK CAN KILL When machine is switched to MMA mode output terminals are always live take care and do not touch electrode and earth by person at same time otherwise electric shock will occur The foot...

Page 19: ...orch and cables in good condition 4 Clean air vents to ensure proper air flow and cooling 5 The fan motor has sealed bearings which requires no maintenance Troubleshooting Service repair should only b...

Page 20: ...tput Power light is lit Gas at torch end when trigger pressed Check torch condition possible break in torch power cable replace torch Machine keeps overheating Warning light is lit on machine Check if...

Page 21: ...r If welding at high currents are required try switching to fixed mains supply or Set AC balance SP to 50 position Arc Flutters when TIG welding 1 Tungsten electrode may be too large in diameter for t...

Page 22: ...points with clean dry low pressure air line HF PCB faulty Contact R Tech for repair MMA Stick welding problems Stick electrode blasts off when arc is struck Welding current set to high reduce amperage...

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