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FREE SHIPPING — Klutch MIG 140SI Flux-Core/MIG Wire-Feed Welder — 115V, 140 Amp, Inverter-Powered

Item# 44725
FREE SHIPPING — Klutch MIG 140SI Flux-Core/MIG Wire-Feed Welder — 115V, 140 Amp, Inverter-Powered

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Reg. $419.99
Sale $389.99

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  • Increased power in a super lightweight package for exceptional portability
  • The inverter system better handles fluctuations in input power for consistent output and better welds
  • Requires less input amperage, reducing the overall input power requirement by up to 25% when compared to traditional transformer welders
  • Versatile welder handles mild steel, stainless steel and aluminum
  • Welds 24-ga. to 3/16in. steel in a single pass
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Product Summary

This Klutch® MIG 140SI Flux-Core/MIG Wire-Feed Welder is a versatile, professional-grade inverter-based 115V welder built to handle industrial and commercial tasks. The inverter-based system offers increased power output from a smaller transformer, resulting in a super lightweight system that weighs up to 50% less than comparably powered traditional models. The MIG 140SI offers ultimate welding control with an amperage output range of 30–140 DC that can handle mild steel, stainless steel and aluminum.

What's Included
  • (1) Wire-feed MIG welder
  • (1) Regulator
  • (1) Gas hose
  • (1) MIG torch
  • (1) Ground cable with clamp
Technologically Savvy

Technologically Savvy

New Inverter-Based Technology — Light, Efficient And Consistent

Great news if portability is important to you … the new inverter-based technology allows for the same weld output as standard transformer-based welders, but at up to 50% less weight! This welder also delivers the same brute power as its transformer-based counterparts, but at lower electricity costs. To top it all off, the inverter-based technology also adds extra features like line voltage compensation, hot start for stick welding, arc force and more to help you achieve a more consistent weld.

Easy to Use — Ready for Action

Ready To Use Right Out Of The Box

This complete welding package is ready to help you dive right into the flux core welding process. The package also includes a regulator with gas hose for MIG welding. Just hook up your bottle of shielding gas and add wire, and you are in business!

The Ultimate In Voltage Control

This unit features an infinite voltage control that allows you to fine tune the voltage independently of the wire feed speed. Use the control to gain more freedom in making the weld puddle perform the way you want it to. Dial out spatter or control the weld puddle while welding overhead. Infinite voltage control puts total control of the welding arc in your own hands, allowing you to get the results you want.

Handy Onboard Settings Guidance

A quick setup guide is located right on the door of the welder, offering easy reference to the preferred settings and other tips you'll appreciate, to help you get your project started on the right foot.

Spoolgun-Ready Design

Now you can add a spoolgun to a 115V machine — without the need for any additional equipment! The MIG140Si accepts the optional Klutch spoolgun (Item# 44453, sold separately) designed specifically for welding aluminum. No more messy and frustrating aluminum projects.

Easy to Use — Ready for Action
Tough, Capable and Versatile

Tough, Capable and Versatile

Ready To Handle The Tough Projects

When it comes to serious work, this welder has some serious capabilities, welding up to 3/16in. steel in a single pass! Need to weld even thicker materials? You can take care of that, too, by using multiple passes.

Delivers Process Flexibility

Built-in polarity control allows you to set the stage for working in the shop or out in the field. Adjust the polarity control for good, clean welds using MIG welding with MIG wire and shielding gas. When your work takes you out and about, the polarity control offers the flexibility to set up for flux core welding with flux core wire almost anywhere that 115V power is available.

On-The-Spot Control

When your project requires multiple spot welds where consistent welding is essential, the MIG 140Si delivers with an adjustable spot timer for precise welding control. This spot timer offers the consistency you need, helping you avoid costly scrap and untimely reworks.

Works With A Variety Of Materials

A wirefeed welder that can only handle one kind of metal can really limit your capabilities. That's why you'll appreciate the versatility of the MIG 140Si — it allows you to weld steel, stainless steel, and even aluminum (with the optional spoolgun Item# 44453, sold separately) with ease.

Use it Almost Anywhere

Performance On The Go

You can't always bring your project to your welder, so the MIG 140Si is designed to perform where and when you need it. From in-shop MIG welding to flux core welding on the go, you'll appreciate the freedom and flexibility that this welder provides.

Powered By Standard Shop Current

No special wiring is required. From workshop to basement or garage, the MIG 140Si plugs right into any standard 115V outlet to get you going on that next project.

Detail Work On Your Prized Possessions

If you're looking to restore that prized old car or take care of your own body work, the excellent MIG characteristics ensure quality welds. No matter how delicate or how tough the project may be, you'll be able to weld with confidence.

Use it Almost Anywhere
Safety matters

Safety Matters

No More Overheating

Dual-purpose overload protection helps keep your equipment safe — protecting your machine from incoming power voltage spikes. It also turns off weld output when the machine is at too high of an operating temperature.

Arc Control At Your Fingertips

From seasoned pro to newcomer on the welding scene, you’ll appreciate the safety and security of a trigger activated arc. There's no need to worry about an accidental arc flash — when you're ready to weld, simply pull the torch trigger and get started.

Weld with Confidence

Expert Answers Are Available

Northern Tool + Equipment is here to help you succeed. Our field trained, dedicated team of welding experts is ready to help — call or email and you’ll get a prompt response.

The Klutch Welders Advantage

The Klutch MIG 140Si Welder comes backed by a 3-year limited warranty. You can be sure that if something ever does go wrong, you’re covered, and we’ll get you back up and on to your next project as soon as possible.

Guaranteed Satisfaction

Shop in complete confidence, knowing that Northern Tool + Equipment protects your investment and is ready to provide you with the assistance and helpful resources you need.

High-Quality Replacement Parts — Always Available

The MIG 140Si includes a high-quality MIG torch with 10-ft. removable hose and uses industry standard Tweco-style nozzles and contact tips, making replacement easy. Replacement parts are stocked at our Northern Tool + Equipment warehouse and ready to ship for your convenience. Easy-to-find Tweco style contact tips and nozzles for both the MIG gun and the spoolgun make finding the right parts easy.

Weld with Confidence

Features + Benefits

Features for FREE SHIPPING — Klutch MIG 140SI Flux-Core/MIG Wire-Feed Welder — 115V, 140 Amp, Inverter-Powered
  • Increased power in a super lightweight package for exceptional portability
  • The inverter system better handles fluctuations in input power for consistent output and better welds
  • Requires less input amperage, reducing the overall input power requirement by up to 25% when compared to traditional transformer welders
  • Versatile welder handles mild steel, stainless steel and aluminum
  • Welds 24-ga. to 3/16in. steel in a single pass
  • Infinite wire-feed and voltage controls provide maximum control
  • Spool gun-ready for easier welding of aluminum with optional Quick-Draw 150 spool gun (Item# 44453, sold separately)
  • Operates from 115V power source
  • Amperage output: 30–140; 30% duty cycle @ 90 Amps
  • For use with or without shielding gas
  • Includes regulator, gas hose, 10ft. MIG torch, 10ft. ground cable and clamp
Key Specs
Item# 44725
Brand Klutch
Manufacturer's Warranty 3 year limited warranty
Ship Weight 38.58 lbs
Volts 115
Amps Input draw: 20A; Ouput: 30–140 DC
Duty Cycle 30% at 90A
Mig Ready Yes
Wire Feed Speed Control Infinite
Weldable Metals Steel, stainless steel, aluminum
Weld Thickness (in.) 24 ga.–3/16
Clamp Cable Length (ft.) 10
Regulator and Gas Hose Included Yes
Shielding Gas Required MIG: Yes; Flux-core: No
Welding Wire Diameter (in.) 0.023–0.035
Power Cord (ft.) 6 1/2
Cart No
Dimensions L x W x H (in.) 17 1/2 x 9 1/4 x 14 1/2

Customer Reviews

Product Question + Answer
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Replacement Parts
Call To Order: 1-800-657-0516

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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Hide Similarities
Volts
115 115 115/230 230 230
Amps
Input draw: 20A; Ouput: 30–140 DC 140 210 250 250
Duty Cycle
30% at 90A 20% at 90A 30% at 150A 60% at 175A 60% at 175A
Output Amps - 25–140 - - -
Mig Ready Yes Yes Yes Yes Yes
Wire Feed Speed Control
Infinite Yes Infinite Yes, 0–700 IMP Yes, 0–700 IMP
Weldable Metals Steel, stainless steel, aluminum Steel, aluminum, stainless Steel, aluminum, stainless Steel, stainless, aluminum Steel, stainless, aluminum
Weld Thickness (in.) 24 ga.–3/16 24-ga.–1/4 in. steel 24 ga.–3/8 in. steel in single pass 1/2 1/2
Clamp Cable Length (ft.) 10 10 10 10 10
Regulator and Gas Hose Included Yes Yes Yes Yes Yes
Shielding Gas Required MIG: Yes; Flux-core: No Optional No for Flux Core; Yes for MIG Yes for solid wire, no for flux core wire Yes - for solid wire; No - for flux core wire
Welding Wire Diameter (in.) 0.023–0.035 0.023–0.035 0.024, 0.030, 0.035, 0.045 0.023/0.024, 0.030, 0.035, 0.045 0.023/0.024, 0.030, 0.035, 0.045
Power Cord (ft.) 6 1/2 10 5.6 10 10 ft. cord w/NEMA 6-50 type plug
Cart No Not included No Yes, integrated cylinder cart Yes, integrated cylinder cart
Dimensions L x W x H (in.)
17 1/2 x 9 1/4 x 14 1/2 12 x 18 x 24 19 1/2 x 10 5/8 x 12 3/8 31 1/2 x 18 7/8 x 36 1/2 31 1/2 x 18 7/8 x 36 1/2