Rank #6 in Best MIG Welder 2026: 10 Ranked by Numbers That Add Up
Sealey Mightymig150 150A Gas/Gasless MIG Welder
Price and rating as shown on Amazon when we collected them. Both change.
The Sealey Mightymig150 is a 150A MIG welder that runs on 230V and does both gas and gasless work. It sells for £282.52 and holds 4.2 out of 5 from 177 ratings, which puts it sixth in this guide. It arrives set up for gasless welding, with four power levels, variable wire speed control and thermal overload protection, and switching to gas needs no more than a polarity change plus a gas conversion kit. Wire capacity is 0.9 kg gasless and 0.7 kg mild steel.
Its own listing is where it gets interesting. The spec table gives an item weight of 24.6 kg and then gives item dimensions of 10L x 10W x 10H millimetres - a machine that heavy is not one centimetre on every side, so the two numbers cannot both be describing the same welder. The same table carries a maximum temperature of 300 degrees Fahrenheit, and the review breakdown shown adds up to 100 (66 five-star, 13 four-star, 10 three-star, 4 two-star, 7 one-star) while the listing reports 177 ratings. Everything on this page comes from the Amazon listing, none of it from testing we carried out.
How those 177 ratings break down
An average hides its own shape. This is the spread behind the 4.2 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £282.52 |
|---|---|
| Rating | 4.2 out of 5 from 177 ratings |
| Maximum performance | 150A |
| Item weight (as listed) | 24.6 kg |
| Item dimensions (as listed) | 10L x 10W x 10H millimetres |
| Wire capacity | 0.9 kg gasless, 0.7 kg mild steel |
| Power levels | 4, with variable wire speed control and thermal overload protection |
| Maximum temperature (as listed) | 300 degrees Fahrenheit |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“The Mightymig is performing well. You can configure the welder to gasless or gas welds depending upon your requirements. Both systems work well. It's been great to use in the restoration of my classic car.”
Verified purchase“Well supplied with flux cored wire. Took a bit to get hold of the correct bits to connect pipe to single use gas bottles. But it worked in the end . Plastic wheels are a bit naff but functional. Lot of play in handle extension. Hey. It's a welder.”
What it is up against
The rivals it was ranked against in Best MIG Welder 2026: 10 Ranked by Numbers That Add Up.
Questions people ask
Is the Sealey Mightymig150 a gas or a gasless welder?
Both. The Sealey Mightymig150 is supplied in gasless mode and can be switched to use with gas by a simple change of polarity and the purchase of a gas conversion kit, model number 120.802032.
How much does the Sealey Mightymig150 weigh?
The listing's spec table gives an item weight of 24.6 kg, and the same table gives item dimensions of 10L x 10W x 10H millimetres. Those two figures sit in the same table but do not describe the same machine.
What wire does the Sealey Mightymig150 take?
Wire capacity is 0.9 kg gasless and 0.7 kg mild steel, and the welder is supplied with 0.45 kg of flux-cored wire and a 1mm contact tip.
What comes in the box with the Sealey Mightymig150?
A comfort grip non-live torch, 1.8m earth cable, 1m gas hose, 0.45 kg flux-cored wire and a 1mm contact tip.
How is the Sealey Mightymig150 rated?
4.2 out of 5 from 177 ratings. The breakdown shown adds up to 100 - 66 five-star, 13 four-star, 10 three-star, 4 two-star and 7 one-star - while the listing reports 177 ratings.
What is the maximum output of the Sealey Mightymig150?
150A, on a 230V supply, with four power levels, variable wire speed control and thermal overload protection.
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