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R-Tech 251 Digital Industrial MIG Welder (240v)

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Order in for UK Mainland delivery on 25/07/2024
£834.00 £695.00

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R-Tech 251 Digital Industrial MIG Welder (240v)
R-Tech 251 Digital Industrial MIG Welder (240v)
R-Tech 251 Digital Industrial MIG Welder (240v) R-Tech 251 Digital Industrial MIG Welder (240v) R-Tech 251 Digital Industrial MIG Welder (240v) R-Tech 251 Digital Industrial MIG Welder (240v) R-Tech 251 Digital Industrial MIG Welder (240v)
This is maximum weld with 1 pass, if you do multiple passes you can weld up to 22mm

9mm Max Weld

This is maximum weld with 1 pass, if you do multiple passes you can weld up to 22mm
This will weld ALL steels including stainless steel

Weld Steel

This will weld ALL steels including stainless steel
You can weld aluminium with the optional spool on gun, you will need PURE argon gas.


You can weld aluminium with the optional spool on gun, you will need PURE argon gas.
Optional spool gun makes MIG welding aluminium easy, wire reel is held on torch.

Spool Gun

Optional spool gun makes MIG welding aluminium easy, wire reel is held on torch.
If your workshop needs that extra oomph, look no further than the MIG251 digital MIG welder. With it's 15KG spool capacity, durable metal wire feed and new Easy Mode synergic setup; the MIG251 is the ideal heavy duty companion.
  • Crystal clear LCD Display - See all settings on one screen. Get welding quickly!
  • EASY SETUP MODES - Professional weld settings built in for 0.6mm, 0.8mm and 1.0mm wire - Get great results
  • EASY MMA/STICK modes for 6013 and 7018 rods
  • Simple to use - Easy navigation - no complicated menus
  • Full manual mode with burnback control.
  • Spool on gun - ideal for aluminium - easy welding of aluminium with optional spool on gun.
  • Metal wire feed assy - Consistent weld bead
  • Low splatter weld due to inverter technology
  • Infinite control of welding amperage
  • High duty cycle - 60% @ 200 amps, 35% @ 250 amps
  • Euro style MIG torch
  • Heavy duty earth / MMA connections
  • 5 year collect and return UK warranty
  • Easy welding of aluminium with optional spool on gun - See the MIG Welder Spool Gun Videos

    Book a welding demonsratation
    Want to try before you buy? Book a demonstration at our Tewkesbury HQ - Available 5 days per week 9am-12pm and 2pm-4pm.
 Amperage Range MIG  30 - 250A
 Input voltage/amps  240v 32A 
 Duty cycle  35% @ 250A - 60% @ 200A
 Amperange range MMA  20 - 200A
 Wire reel size  5KG & 15KG
 Wire diameter  0.6mm , 0.8mm, 1.0mm
 Roller size fitted  0.6mm , 0.8mm, 1.0mm
 Net weight  20KG
 Dimensions  480 x 270 x 600 mm (H x W x D)
 Euro style torch  Yes - Easy fitment of torch
 Gasless wire  Yes - Easy reversal of polarity for gasless wire
 Max Thickness Steel  9MM Single Pass
 Max Thickness Steel  19MM Multiple Passes

5 year collect and return UK warranty - What is this?in the unlikely event of machine failure, R-Tech will pay to collect, repair and return the MIG welder to you quickly- No quibble warranty

Generator Friendly - Generator must be minimum of 7KVA 240V and fitted with AVR (auto voltage regulation)

Package Includes, R-Tech MIG251 MIG Welder, 3M MB25 Air Cooled MIG Torch, Earth Lead, Gas Hose, Mains Cable, Gas Regulator, Owners Manual

The R-Tech MIG251 carries the following warranty:-

  • MIG251 - 5 Year Warranty
  • Regulator - 1 Year Warranty
  • R-Tech MIG Torches - 3 Month Warranty
  • Earth Lead - 3 Month Warranty
  • Optional Spool Gun - 1 Year Warranty

R-Tech machines are designed to be robust, easy to use and highly reliable but in the unlikely event that your welder or plasma cutter requires attention, R-Tech promise to:-

  • Arrange collection via next working day UK courier [48hr offshore]
  • Quickly repair the machine at our Technical and R&D centre in Gloucester
  • Deliver back via next working day UK courier  [48hr offshore]
  • All costs covered by R-Tech - Yes, Collection, repair and delivery!

No questions, no hassle, just honest and reliable service - A true no quibble warranty

Most of our competitors only offer return to base [RTB] warranties - you have to pay and arrange to get it back to them which can be a hassle. Many others offer warranties that have clauses and if you don't have it serviced yearly by them, at your cost, the warranty will be void.

Other benefits of owning an R-Tech machine include:-

  • Free friendly and knowledgeable technical advice via phone and email
  • Free machine setup help always available - We want you to get the best from your machine
  • Ten year Duty-of-Care on all our machines, giving you piece of mind that spare parts will be available if needed
  • Video's to show how to use and setup your R-Tech machine.
  • 2 year extended warranties available at a minimal cost.

Don't just take our word for it - see our customer reviews page to see what real customers say about the R-Tech products and our service & support.

View File
R-Tech MIG251 MIG Welder Owners Manual

  • What is Easy-Set technology on the MIG251?

    Easy-Set technology takes the guess work our of setting up machine for your desired weld. You simply use two buttons to select wire size being used and material thickness to weld.
    The machine then sets the wire speed and welding power accordingly, you then just press the trigger and start welding - it is that simple!

    Easy-set is ideal for all users - the beginner / occasional / proffesional welder as you can get welding by the press of 2 buttons - no need for charts / remembered settings etc as it's all built in for you.

    You also have a trim for wire speed and welding power, so you can trim it +/- to suit your personal preference of travel speed / weld bead thickness.

    In image below, using 0.8mm wire, you have selections for 0.8, 1.0, 1.2, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0mm - Just select thickness and get welding.

    MIG181 Easy Setup Screen

    If you want to fine tune the weld characteristics to suit your personal preference.
    You can trim the wire speed by 1 m/min by turning wire speed knob.
    You can trim the welding voltage by 1V by turning welding voltage knob.

    MIG181 Easy-Set with trim

  • What settings are there in manual mode on MIG251?

    In MIG Manual mode, you have full control of machine settings including.

    Wire feed speed 1.5 - 15 m/min
    Welding voltage 13V - 27V
    2T/4T trigger options
    Burnback control 0s - 2s
    Spool on gun operation off/on

    2T - Press trigger to start weld, release to finish weld.
    4T - Press and release trigger to start weld, To finish weld press and release trigger.
    This is commonly know as trigger latching.

    Burnback is how long the welding power will continue after wire feed has stopped, this stops the wire from sticking to workpiece when weld finished

  • What is Meant by Duty Cycle on the MIG251?

    Duty Cycle refers to how long a machine will operate for before it automatically stops the welding ARC to protect its components from overheating.

    A 35% duty cycle at 250 amps would mean that you are able to weld at 250 amps for a maximum of 3.5 minutes out of 10 before the machine shuts off to cool down.

    Higher duty cycles at higher amperage indicate a machine is made from more high quality components, built to withstand the stresses welding places on them.

    We believe on a minimum of 35% duty cycle, most of our machines are 35%-60% at maximum amperage. Built to last, ideal for all users -  Industrial, D.I.Y, Home workshop. 

    The MIG251 has a 35% duty cycle at 250 amps and a 60% duty cycle at 200A (200A is about 8mm weld)

    At R-Tech we believe in building machines to last, with minimum down time to our customers, so we fit the most reliable power modules and IGBT's available coupled with oversized heatsinks. Therefore our machines are able to work harder for longer! 

    We also quote our duty cycles at machines MAXIMUM amperage unlike some manufacturers who sneakily quote duty cycles NOT at maximum amperage which can be quite misleading! Duty cycle is very important, 20% is not an industrial duty cycle.

    I.E Competitors state on thier 200amp machine, 60% duty cycle @140Amps.. So what is the duty cycle @ 200Amps?? 

  • Can I Stick/MMA Weld With An R-Tech MIG 251?

    Yes you can, the MIG 251 is fitted with stick welding functionality and will comfortably burn rods up to 4.0mm smoothly. This makes the MIG 251 suitable for agricutural welding jobs such as digger buckets, railings and gates posts.

    With the Easy-Set function, you simply select rod size being used I.E 2.4 / 3.2mm and thickness of material to be welded, the machine sets required power for you, then just start welding, it is that easy! 

  • What 240V supply is required to run the R-Tech MIG251?

    The MIG251 is a powerful machine with its 250A output and an industrial 35% duty cycle. Suitable for Industrial enviroments and also for the home user who wants to weld 6mm+.

    You will require a 32A 240V supply, which is quite easily fitted to most workshops.

    Even though it has a high 250A output ideal for thicker materials, it is also great welding thin material like car body work with its low starting amperage of 30A.

  • Why is a Euro MIG torch on MIG251 superior to a fixed torch?

    We fit Euro style torches on all of our MIG welder range.

    These have many benefits over machines with a fixed torch as found on the basic / DIY machines.

    They give consistent wire feed speed giving a more uniform weld.

    Easy fitment if torch becomes damaged - for fixed torches you will have to dis-assemble part of the machine.

    Easier to change liners if they become worn

    Better feel in the hand, Euro torches are generally better quality.

    You can easily select preferred style of euro torch and fit quickly and easily.

  • Can I Weld Aluminium With An R-Tech MIG251?

    Yes you can. The MIG251 has a spool gun attachment as standard, purchase a spool gun and a reel of aluminium wire and use pure argon gas and you will be welding aluminium quickly as easily with great results.

    You simply remove the standard torch, fit the spool gun onto euro socket and seperate 7 pin plug to machine spool socket (this controls wire feed speed on the spool gun).

    Welding aluminium on machines with no spool gun feature is difficult and can be very frustrating due to the wire snagging at wire feed and causing birds nests found when using just a teflon liner in the torch, the wire has to travel 3 metres and due to it being soft is difficult to feed long distances, on a spool gun, the wire only hass to travel a few inches before going into feed rollers.

    View our videos on how to weld aluminium with a spool on gun 

  • Which Are The Best Wire Diameters To Use In The MIG 251?

    You can use both 0.6mm, 0.8mm and 1.0mm diameters in the R-Tech MIG 251. We get excellent results when we use the following - 

    For anything 2mm and below, such as car body work, we would recommend 0.6mm wire thickness. This is because the wire requires a much lower amperage to achieve briliiant penetration and prevents burning holes in the work piece. 

    For anything 2-3mm and above, such as chassis work, steel fabrication we would recommend 0.8mm wire thickness and for 5-6mm+ 1.0mm wire. 

    Our machines are fitted with a double grooved roller to suite both 0.6mm / 0.8mm wire and also a spare 0.8mm / 1.0mm roller. Simply unscrew the retaining screw from roller, turn the roller around to match the wire diameter and re-install the retaining screw. 

  • Which Gas Do I Need To MIG Weld on the MIG251?

    We reccomend using a gas that contains 95% Argon and 5% Carbon Dioxide for any welding less than 6mm.

    If you are welding anything more than 6mm, we would suggest an 80% Argon and 20% Carbon Dioxide mixed gas. 

    Gas MIG welding will always give you the best results, the MIG251 also supports gasless MIG wire, this is ideal if welding outside or where gas is unavailable.

    Gas bottles can be purchased from many outlets and you have option of buying the bottle and gas, when bottle is empty - return bottle for a fully filled one, this is generally know as 'rent free bottles'

    For high / industrial use, you can purchase via a rental agreement normally paid by direct debit - more cost effective for high volume users.

Welding Guides, Videos & Support from the pros.

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