Best Spot Welder Reviews 2021 – Buying Guide & Top Picks

best spot welder

This detailed review will help you choose the Best Spot Welder for your welding workshop. My Welding Yard has discussed all the features of the welding machines based on my practical knowledge and experience. The prices, workability, work cycle, and a detailed comparison of different qualities will genuinely help you in your purchase.

For a welding professional, it is important to find reasonable and the best machine so to ensure that you can weld the thinnest metal together as other techniques become useless at this scale. I have experienced different machines that work best in hands but do not provide smooth or clean welds and I do not want this to happen to you.

This guide will help you in making a good decision as a wise man once said, “A man learns from his own experiences, but a wise man learns from the experiences of others.”

Good Luck!


SUNKKO 709AD+ Battery Spot Welder for Welding Lithium-ion Battery Pack

  • 30% Duty Cycle
  • versatile welder


Stark Portable 240V

Stark Portable 240 V Spot Welder

  • 50% Duty Cycle
  • 240 Volts
  • Replacments tips


Stark Electric 120v

Professional Electric 120-Volt Spot Welder

  • Light Model 120V
  • Single Phase


6 Top Spot Welding Machines for 2021

1.Stark Portable 240V Spot Welder

Stark Portable 240 V Spot Welder

The first mentioned welder is STARK Portable 240 V Spot Welder. It works on the simple lever mechanism and can give strong spot welds on a wide range of metals. It can weld mild, un-coated galvanized or stainless steel as well as cast iron. The size of this welder is approx. 18.5×4.5×7.5 inch.

It weighs almost 29 lbs so one can carry and transport it from one workplace to another with ease. The fixed handle on the top makes it the best portable spot welder in town.

Its single-phase mechanism allows you to directly insert the metal and start welding. It is the best choice for a beginner as well as the DIY for its quick and reliable working. It has a quick process and the working mechanism assures a 50% duty cycle, it comes with an extra pair of welding tips for multiple uses. The tips are easily replaceable with the twist-off and screw-on technique.

The price is very affordable as compared to many other welders of the same quality. Its performance is not affected in welding even with the thicker pieces of metals and gives smooth welds. The easy to use, long term working and good quality of this welder pays off the price.

  • Simple Lever Mechanism
  • Affordable and Cheap
  • Portable
  • Can work with a variety of materials

  • It does not have a power plug
  • A bit heavy to carry along

2.SUNKKO 709ADSUNKKO 709AD+ Battery Spot Welder for Welding Lithium-ion Battery Pack

SUNKO 709AD has a new panel design for better welding function which improves the efficiency of the battery pack welding process. This spot welder has an intelligent cooling system.

The built-in sensor senses the temperature of the machine and automatically cools it down to the required temperature. It is specifically designed for battery welding (18650, 14500, and any other lithium batteries, etc) The welding thickness for various materials varies as 0.03-0.2 mm for welding pen, 0.03-0.3 mm for fixed copper head, and 0.03-0.15 mm for a pure nickel.

The welder has also a soldering function and it works very efficiently. The soldering temperature can go up to 300°C within 7-8 seconds which is definitely a plus point. It comes with a welding pen and a pedal so you can work with ease.

It has an auto-welding and auto-cooling option and it also has a mini-grinder for copper rods. The maximum welding current can go up to 800 A as an output. You can improve the performance of spots by adjusting the welding current between 1-8 level, the pressure knob between the copper rods and nickel strips, and the pulse quantity from 2-18 level.

The maximum welding thickness for pure nickel is 0.25 mm and 0.3 mm for nickel-coated steel. It has a 30% work cycle which means the temperature goes 300°C within 7 seconds. For the soldering function, you need to turn on the welding function as well.

The core and the case of the soldering pen are separable, if the pen doesn’t work that means the connection between the case and core is weak. Pull out the core and insert it back into the case and you are all set.

  • Auto-cooling and welding mode
  • Portable
  • Soldering Pencil
  • Cannot be used for cast iron or aluminium

3.Stark Electric 120-Volt Spot Welder

Professional Electric 120-Volt Spot Welder

STKUSA Electric Spot Welder is equipped with similar features to the above spot welders. The difference arrives in the plug-in properties of this welder where it has a power cable that can be connected with a switch. It requires a voltage of 120 V and smoothly welds up to 1/8’’ combined thickness of the metal.

you can rely on its excellent working on galvanized, un-coated mild and stainless steel. Although, It is not designed for cast iron or aluminum and the working might be affected on these metals if you are not well-trained. Owing to its lightweight of 29 lbs it is highly portable.

It welds by a press and weld technique and you only have to place the metal between its jaws. There is a lever on the top for applying pressure on the jaws. One of my friends bought it for a fabricating project and it proved the best in itself for the project. A typical weld takes less than 1 second if the arms are adjusted perfectly.

Check: Best Tig Welder Reviews 2021

Though it is not designed for aluminium sheets but to my experience it can work for that too. You just have to sandwich the aluminium sheet between two thin sheets of stainless steel. It is a quick and reliable source of weld for DIYers as well as professionals and you won’t regret buying it.

  • Clean Welds
  • Good Price
  • Works for a wide range of metals
  • Heavy to carry
  • Arms need proper adjustment

4.Mophorn 737G Pulse 

Mophorn 737G Pulse Spot Welder 0.2 mm Battery Welding Machine


Mophorn Pulse Spot Welder has multi-mode technology features and allows the user to easily select the mode of his choice. These modes include different pulse rating, welding current, and voltage. 737 G battery spot welder is designed with a dual pulse mode selection and 0-99 level of welding current. The current and pulse ratings can be clearly seen on the screen, making it easily understandable for the worker.

I found it very suitable for nickel-plated strips and the performance is good with 18650, 14500, and any other rechargeable lithium batteries. It has a wide variety of applications, it assembles and weld lithium batteries, repairs battery packs, welds lead sheets and wires of hardware parts. Its foot-pedal mechanism makes the welding more precise and smoother.

The maximum welding thickness for this welder is 0.15 mm for nickel-coated steel and 0.12 mm for a pure nickel. The 4100 rpm radiator works best against overheating and saves the welder for a long. You can use the push-up welding mode to assemble a small pack of batteries.

Its size is approx. 10.4×5.5×10.2 inch and weighs extremely light for almost 12 lbs. The fixed handle on the top makes it portable and easy to move. The tool tray is a plastic battery holder that comes with magnets to keep said batteries in place. It does 20 welds per minute at its maximum power, so it makes it a decent spot welder with a good duty cycle.

  • Portable
  • Works on AC and DC Supply
  • Reasonable Price

  • Not compatible with welding pen
  • It is low power and has to be set high

5.Lenco LNXL4000 

Lenco (LNXL4000)

This Autobody Spot welder is considered to be a high-quality welder and so is considered the premium choice for most of professional workers. It has an automated control panel, solid-state time, and a well-designed body.

The best thing about this spot welder is the automatic ON/OFF technology, you need to set the timer and it will automatically stop after finishing the weld. There are electrode guns that are set to the target and the switch is turned ON.

It weighs 110 lbs and provides an output power of 50-60 A. The working process is quick and self-controlled which makes it the best choice for professionals. It is not good for beginners as it requires a hands-on experience on the machines. It is not portable but has wheels for movement.

It does not require any extra wires and will minimize the additional cost for the accessories. This spot welder will cost you a price worth of its matchless qualities.

  • Smooth
  • Consistent welds
  • Mobility
  • High-quality
  • Costly
  • Not for beginners

6.SUNKKO 709A Spot Welder



SUNKKO 709A Li Battery Spot Welder is a complete package in itself. It comes with a welding needle, foot pedal, different welding tips, soldering pen, fuses, battery clamp, and other accessories.

The handheld soldering pen and adjustable pulse welder makes it quite handy and flexible in use. The foot pedal helps in achieving accuracy in precise welding spots. The adjustable pulse time makes it very reliable.

It works on 110/220 V and gives 50-800A of spot-welding current. you will find this spot welder competitive in welding and repairing different battery packs, button batteries, and power banks. I used it in welding stainless steel, iron, nickel, and other hardware accessories. In my opinion, it has a wide range of materials it can work on.

The machine is a combined source of spot welding and soldering which makes it more convenient over the other welding machines. The price range is quite good for its functioning and you will definitely find it the best choice for your work. See Also: Best Mig Welder 2021

  • Multi-purpose
  • Portable
  • Wide range of materials to work on
  • Complete working kit
  • Heavy to carry
  • A bit costly

Buying Guide

A buying guide is very important for you to know about the features you must look for in your product. I have shortlisted a few points to ease this work for you.


The first thing you must look for in your spot welder is durability and weld quality. The machine that provides quality welds with a smooth and clean surface, its duty cycle should be 50% or more, the list of materials that it can weld and the welding current, if it fulfills all these properties then it should be the pick.

There are different types of welders, some have tongs while others have cables. The ones with cables give you the advantage and stay at your table for a long. You can easily weld something on another side of the table without carrying it along every time. While the welder with tongs can help you if it is very easy to carry otherwise you will bear the weight every time you use it.


The second factor to consider is price. If the qualities are worth enough the price then go for it otherwise look for an affordable product so you don’t sell yourself up for a single machine.


Last but not the least, you must check for the warranty of the product before buying it. There are companies that offer different types of warranty, you must know what type of warranty is available for your product.

Frequently Asked Questions FAQs

What is a spot welder used for?

Spot welding is typically used for welding two or more metal sheets together by applying pressure and heat from an electric current to the welding area. It is also called a resistance welding process. The welding heat is generated by the electric current, which is transferred to the metal alloy through the electrodes, the material melts and fuses the parts together.

How do you spot weld at home?

Spot welding is precise welding and needs a bit of experience with the machine. You can do spot welding at home if you have a good understanding of the machine for making the adjustments. If you have not enough knowledge about the voltage and current ratings etc then it can be dangerous for you.

Can you get a shock from a spot welder?

In this type of welding, the current is very high but the voltage is low. So, there is no risk of getting a shock in spot welding.

What is the difference between spot welding and tack welding?

Tack welding is used as the temporary means to hold the components in proper location, place, alignment before the final welding while spot welding is used for the permanent joining of the plates.

How thick of metal can you spot weld?

Spot welding is normally used for a thickness of up to 3 mm. The ratio of the thickness of the targeted metal should be lesser or equal to 3:1. Spot weld diameter ranges from 3 mm to 12.5 mm.


The best spot welder has an application of providing the precise welds, a machine that goes best with the output current and precision should be definitely the one. My favorite spot welder is STARK PORTABLE SPOT WELDER because it has all the best of features, its price is good and it works for a variety of materials.

If I had to choose something other than this welder, then I will go for Sunkko 709AD+ Spot Welder for its automated technology. These machines not only provide smooth and clean weld but increase the efficiency of your work. These are quick and do more work in less time.

Hello Everyone, I am James from Kentucky and been into this welding fiasco for 13 years in that time I have worked as a private welder and did most of the auto restoration work. In this recent, COVID-19 outbreak I decided to start a welding blog and share welding tips along with product reviews.

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