Best Spot Welders 2020 – Reviews, Comparisons & Guide

Spot welders are designed to make small weld spots that clamp pieces of metal together.

These welds are often used on vehicles, watercraft and many other pieces of equipment and machinery.

The spot welders are the ones that can be used on the material types and thicknesses especially on the thinner metals that you work with most often.

Best Spot Welders

We asked our fabrication welding specialist to tell us which spot welders they used, and which ones they would recommend for novices and professionals alike. The following four machines were the most frequently suggested items.

Comparison Chart Of Our Favorites





Mophorn 737G Pulse Spot Welder

Suits for various sizes of battery pack

SUNKKO 737G+ Battery Spot Welder

New panel design with intelligent welding function

Stark Professional Electric 240 Volt Portable Spot Welder Machine

Simple Lever Function

Lenco Autobody Dual Spot Welder

Maximum capacity: 20 gauge Autobody steel

Best Spot welders 2020 Reviews

1. Mophorn 737G Automotive Spot Welders


  • Item Weight: 12.08 pounds
  • Dimensions: 9.1 x 5.5 x 8.3 inches
  • Style: 737G
  • Voltage: 110 volts
  • Batteries Required: No
Mophorn 737G Pulse Spot Welder

This welding device can be used for a wide variety of applications. It can be applied when working on a button battery, polymer battery and protection boards. It is useful for automotive body, stainless steel hardware repair and installation, stainless steel mesh installation and repair, or working on things like your mobile phone cameras.

It has foot pedal controls that give you the ability to weld a spot precisely where you need it at the temperature that you need for the material you are welding. It has a fixed welding type that is illuminated with LED lights. It is the pushup welding mode that is ideal for small battery pack work.

The LCD display panel shows you the pulse quantity and the current you are operating at. You can set or change the pulse and current with simple to use adjustments. It also has an efficient cooling system that uses a smart chip to help prevent the device from overheating.

2. SUNKKO 737G+ Battery Spot Welder


  • Item Weight: 15.32 pounds
  • Dimensions: 5.51 x 9.84 x 7.87 inches
  • Model Number: 737G+
  • Material: Iron, plastic, steel, copper
  • Power Source: Ac
SUNKKO 737G+ Battery Spot Welder

This welding device is battery powered. It has built-in temperature sensors, and it has a cooling system that automatically kicks in when the internal temperature of the machine reaches a pre-determined range.

This is a small device that is easy to carry and easy to use. It can be used to weld fixed copper that ranges in thickness from 0.03 to .03mm and can be used to weld nickel that is up to 0.15mm thick. It comes with a welding pen that is very easy to learn to control and use. The panel is designed to help you control the pen and keep your welding functions properly adjusted.

When you do not want to use the welding pen you have the option of using the fixed welding head and the foot pedal control to create the welds you need. You can use the welding pen in conjunction with the foot pedal to increase control or you can use the welding pen without the foot pedal. The variations of processes allow you to control the work you do.

3. Stark Professional Electric 240 Volt Pro Spot Welder


  • Item Weight: 28.4 pounds
  • Dimensions: 20.39 x 9.49 x 6.69"
  • Model Number: 55010
  • Manufacturer: Stark USA
  • Material: Mixed
Stark Professional Electric 240 Volt Portable Spot Welder Machine

This welding equipment is constructed on the single-phase design. It allows you to weld together a large variety of materials and thicknesses. It is easy to operate and you simply put the materials into position and press the lever to start the weld.

The welding tips of the device are formed from high-quality steel material. They provide the strength and ability your machine needs to make welds on thicker items. The machine even comes with replacement tips for when your tips need to change. The tips easily twist off and the new tips are simply screwed into a position where the old one was.

There is a lever that activates the welding process. You press down on the lever and hold slight pressure against it to hold it in position and the machine does the work. It has a convenient handle designed into it so it is very portable.

It has a 240 volt rating and provides 2.5 KVA with a 50% duty cycle or operating factor. It can handle mild steel that is up to 1/8” thick. It is a 16 amp device with a six inch throat depth.

4. Lenco Autobody Portable Spot Welders


  • Item Weight: 105 pounds
  • Dimensions: 20-1/2"H X 11"W X 16"L
  • Line fuse: 50 AMP
  • Single phase: 60/50Hz KVA
  • Welding cable length: 5'
Lenco Autobody Dual Spot Welder

This is a portable welding device that has wheels to help you move it. It weighs 105 pounds but the convenient handle and wheels help you to reposition the device with very little effort.

It has the ability to weld up to 20 gauge auto-body steel. It has a five foot welding cable, and a 50 foot power input cable. There is ample storage space for commonly used items included on the device so you can have everything you need readily available.

The control panel is protected so there are no accidental setting changes while you work. It has an easy to reach on and off switch and a solid-state timer.

This auto body spot welder is a solidly built machine that is durable and will provide you with the ability to weld on the majority of metals you want to use it on. It is a single-phase device that is rated 60/50Hz KVA. The primary voltage is 208/230 and the line fuse is a 50 amp.

How to Choose the Best Spot Welder

Spot welding requires you to have welding equipment that can perform the process on the thickness of materials that you will normally be using. Before you buy a machine familiarize yourself with the following terminology and common feature descriptions that manufacturers use. Then you will understand the product descriptions more clearly and be able to choose the best equipment based on your needs.

Machine Type

There are basically two types of spot welding machines to choose from. The design of the machine will be determined by the work you will be using it to do and where you will be working.

Stationary machines are larger, heavier and harder to use. They are often more powerful and can be used to work on thicker pieces of metal than the smaller portable machines can.

Portable machines give you the ability to take the welding equipment with you. The portable machines are very handy for repair work around a farm or on a large ranch. You cannot weld materials that are as thick as you could if you were using the stationary device.

Power Considerations

The power supply for your machine will play a huge role in the capability of the machine. A generator that is a 230 volt machine will provide you with the ability to operate the typical portable spot welder. If you have a stationary welder you need a generator that is a 400 volt for sufficient power.

Operating Factor

The operating factor will often be described on the machine package and if you are unfamiliar with this term it is the same as a duty cycle. If the machine is described as having an operating factor of 70% at 100 amps then in a ten minute time period of machine operation at 100 amps the device will work 7 out of those ten minutes and take 3 minutes to re-cooperate.

A machine that is a higher current machine will have a higher operating factor and be more efficient.

Spot Current

When you see something on the machine advertisement that says 3-6000A or 15000A spot currents you can see what quality of welds the machine is capable of producing. The higher the spot current number is the better the weld quality will be.

Secondary Vacuum Voltage

This will tell you the priming quality the machine has. This voltage is measured at the terminals of the device prior to the application of welding current.

Isolator Fuse

An isolator fuse is a voltage surge protection feature and it can lengthen the normal life expectancy of the welding equipment.

Frequently Asked Questions 

How strong is a spot weld?

A spot weld is as strong as a normal weld. It is a permanent weld solution that clamps or joins two pieces of metal together. These welds can be relied upon to hold under all types of situations. They are used frequently in automotive design and metal watercraft construction.

What is meant by spot welding?

Spot welding is the process of joining two pieces of metal with a very small weld. Spot welding does not create a large visible weld line and can be used when the materials being joined are different thicknesses or different metals.

What does a spot weld look like?

A spot weld looks like a small section of a weld. It is a process used to join two items without doing a solid bead line of welding. You really will not notice the spot welds on items, like the 5000 welds on a car body, unless you are looking very carefully for them.

How many spot welds do a car have?

On the typical car body, there are 5000 spot welds. These spot welds join components that make up the car, the frame and the body together so you have one complete and solid structure when you are finished.

What is the difference between spot welding and tack welding?

Tack welding is a process of welding something in place just enough to secure it and keep it in place while you do a more permanent welding process. Spot welding is a permanent process designed to be durable and create a long-lasting joining of the materials.

What is the difference between spot welding and resistance spot welder?

Projection welding is actually spot welding with a few changes so that the welds can be created on thicker substances of 0.035 inches or more. Pioneer resistance welding processes can be used on thinner materials but most people do not try to apply it to materials thinner than 0.035 inches.

Final Note

If you are looking for the best spot welder machine for use on battery packs then we recommend the Mophorn 737G Pulse. It is small and powerful and has plenty of safety features designed into it so you can make the best welds on the items you need to work on.

If you are looking for a spot welder that can be used on larger items like when you are doing auto body work then we recommend the Lenco LNXL4000. It has wheels designed onto it to make it easy to move the machine around your shop, and it has the power to weld on most auto body parts.

Richard Boyer

Richard wants to educate you, inform you, and prepare you to make the best decision you can concerning welding related items.

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