Longevity TIGWELD 250 EX Operating Manual
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Longevity TIGWELD 250 EX Operating Manual

250 amp ac/dc pulse igbt tig welder with pfc technology
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250 Amp AC/DC Pulse IGBT TIG Welder With PFC Technology

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Summary of Contents for Longevity TIGWELD 250 EX

  • Page 1 Operating Manual 250 Amp AC/DC Pulse IGBT TIG Welder With PFC Technology...

  • Page 2: Table Of Contents

    TIGWELD® 250 EX Table of Contents Table of Content Pg. 1 Thank you From LONGEVITY Pg. 2 Warranty/Shipping Damage/Order Information Pg. 3 Safety Information Pg. 4-5 Specifications and Ratings Pg. 7-8 Main Unit Knob/Button/Function Diagram Pg. 9-10 TIG Pulsing Pg.11 TIG Section: Torch Assembly Pg.

  • Page 3: Thank You From Longevity

    TIGWELD® 250 EX We, at LONGEVITY, want to thank you for purchasing our product. You are almost ready to experience Longevity Welding first hand. Longevity definitely appreciates your business and understand that this equipment may be overwhelming to setup and operate so we have prepared a manual that will assist you in understand your new plasma cutter/welder.

  • Page 4: Warranty/Shipping Damage/Order Information

    LONGEVITY customers with repairs, replacement, and service. If your unit is not manufactured by Longevity and you cannot receive service from your manufacturer or seller, Longevity will lend out hand. Our warranty policy is also available for all plasma cutters and welders.

  • Page 5: Safety Information

    Surface noise generated while welding or cutting can be harmful to hearing. In the event of a machine fault.  Refer to this instruction manual.  If the fault cannot be determined, contact your local dealer or supplier for assistance. www.longevity-inc.com...
  • Page 6 Use a screen or curtain designed to keep passers by from viewing the arc.  The arc spray and metal spray from machine use may cause nearby fires. Use caution.  If, after reviewing this manual, you have any problems in setting up or operating your machine, contact us at help@longevity-inc.com. www.longevity-inc.com...
  • Page 7 TIGWELD® 250 EX  Main Unit  Amp Adjust TIG Torch and TIG Torch Pieces  Stick Electrode Holder  Foot Pedal  Ground Clamp  Air Hose and Ground Clamp *Not pictured  Argon Regulator *Different then pictured. www.longevity-inc.com...

  • Page 8: Specifications And Ratings

    100% @ 100 A Max Amps 10-250 A 220v STICK 35% @ 160 A 60% @ 130 A 100% @ 100 A Rated Duty Cycle at Max Amps 110v 35% @ 100 A 60% @ 90 A 100% @ 80 A www.longevity-inc.com...
  • Page 9 HF TIG LIFT TIG Pre Flow 0.1-9.9s P.P. Current Post Gas 0-25s Up-Slope Time 0-10s Down-Slope Time 0-10s Pulse Frequency (DC 0.5-500Hz TIG) Pulse Wide Range (AC 0.5-10Hz TIG) Cleaning Effect +30% -30% I/Hot 0-2s Arc Force 0-100% T/Hot 0-100% www.longevity-inc.com...

  • Page 10: Main Unit Knob/Button/Function Diagram

    For TIG Welding Argon Stopping Indicator For TIG Welding Foot Switch Indicator Lights up if foot switch is connected Hot Start For Stick Welding Arc Force For Stick Welding TIG AC Welding Indicator ON/OFF TIG DC- Indicator TIG DC+ Welding Indicator www.longevity-inc.com...
  • Page 11 After you press this button, gas will flow out for 30s. Press the button again to stop the test gas flow before the 30seconds are up. Process Button Mode Button ON/OFF HF Contact Button Select Lift-TIG or HF Start. www.longevity-inc.com...

  • Page 12: Tig Pulsing

    Mode of operation of TIG pulsing when TIG DC welding is selected: Legend: - IS Starting current - IE Final current - tUp Upslope - tDown Downslope - F-P Pulsing frequency (1/F-P = time interval between 2 pulses) - dcY Duty cycle - I-G Base current - I1 Main current www.longevity-inc.com...

  • Page 13: Tig Section: Torch Assembly

    TIGWELD® 250 EX TIG Section: Setting Up The TIG Torch www.longevity-inc.com...

  • Page 14: Selecting The Right Tungsten

    2% Thoriated Tungsten (TT2) – (red tipped) - This tungsten is the most common tungsten currently being used with LONGEVITY DC TIG. It is generally utilized for DC welding of mild steel, bronze, and stainless steel and basically all metals except aluminum and offers excellent performance.
  • Page 15 Sharpening a tungsten is very important for a nice fine arc strike. There are auto sharpeners to place the perfect sharpening point on your tungstens or you can simply use a grinding wheel to sharpen your tungsten. Remember, after sharpening to a pencil point, you want to flatten the bottom for a good arc. www.longevity-inc.com...

  • Page 16: Selecting The Right Filler Rods

    E1/16" X 36" ER80SD-2 Steel Wire Longevity offers quality filler rods at affordable prices. Please take a look at the selection of filler rods that we carry to decide what the best application of rod will be for your weld.

  • Page 17: Argon Regulator Installation

    We recommend about 18 CFH. Remember, that you also have a post flow setting on the unit to pass more argon after the arc to cool the electrode. Argon Regulator Assembled. *argon regulator may not be the same as pictured. www.longevity-inc.com...

  • Page 18: Basic Tig Operation

    For the right tungsten electrode, please refer to earlier in this manual or go to www.longevity-inc.com Filler Rod Selection: Depending upon the metal to be welded, filler rod selection is critical. Consult with your local welding supplier for the optimum filler rod to properly complete the weld.
  • Page 19 5 seconds. 7. When finished welding always let the welder's fan run for a minute or two to cool the machine before turning the power switch off. Basic Diagrams of Welding Fig.1 Figure 1: Comparison chart of welds Fig. 2 www.longevity-inc.com...
  • Page 20 Remember: the length of the arc should be about equal to the diameter of the bare electrode except when welding in the vertical or over- head position. In either position, a shorter arc is desirable because it gives better control of the molten puddle and prevents atmospherical impurities from entering the weld. www.longevity-inc.com...
  • Page 21 TIGWELD® 250 EX Sample of a quality stainless steel weld: TALLATION www.longevity-inc.com...

  • Page 22: Basic Stick/Arc Welding Operation

    (welding rod) manufacturer for the type and size of the electrode used. When welding in the AC mode the AC Frequency control will affect how crisp the arc is, whether it is smooth and buttery or deeply penetrating. Use it to suit the desired weld finish. www.longevity-inc.com...
  • Page 23 =straight polarity (typical stock machine setup) electrode positive = reverse polarity Be sure to observe the electrode manufacturer recommendations regarding polarity. If the weld appears lumpy, porous or otherwise malformed, change the polarity of the ground cable and the www.longevity-inc.com...
  • Page 24 AC Welders. E7018AC Low-hydrogen electrode; for low, medium and high-carbon steels; 70,000 PSI AC,DCEP tensile strength; ideal for out-of-position welding and tacking; specially formulated to operate with small 208/230 volt AC welders. www.longevity-inc.com...
  • Page 25 TIGWELD® 250 EX www.longevity-inc.com...
  • Page 26 - Medium (can be more spatter also); DCEP - Most penetration Catalog and Capabilities LONGEVITY has what you need for stick welding, from welders to welding supplies and protective clothing. Stick welders come in two basic classifications; 115V stick welders and 230/460V stick welders.

  • Page 27: Routine Maintenance

     Replace any worn or damaged consumables before using machine.  For periods of prolonged non-use, remove cables and store them in their original boxes in a cool dry place, free of bug infestation. www.longevity-inc.com...

  • Page 28: Troubleshooting

    Problems Solutions Machine will not turn  Check cords and breaker. If nothing is found, contact LONGEVITY  The machine runs, but Check to see if you are in the right mode tig or stick. Check the torches and nothing is happening your ground.

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