Unimig Viper 120 Synergic: Pros And Cons, Common Issues, And Best Places To Purchase
UNIMIG Viper 120 Synergic Information
The Unimig Viper 120 Synergic is a lightweight and portable MIG welder that is perfect for small repairs and DIY projects. It features a simple, user-friendly interface that makes it easy to get started, even for beginners. The welder also includes a number of advanced features, such as Synergic control, which automatically adjusts the welding parameters for optimal results.
Introduction
The Unimig Viper 120 Synergic is a 120A MIG welder that is powered by a 240V single-phase input. It has a maximum duty cycle of 10% at 120A, which means that it can be used for short periods of time at high amperages. The welder is also equipped with a built-in 10A plug, which makes it easy to connect to a standard household outlet.
Specifications
Here is a table of the full specifications for the Unimig Viper 120 Synergic:
| Specification | Value |
|---|---|
| Input Voltage | 240V Single Phase |
| Input Power | 4.15 kVA |
| Maximum Current | 120A |
| Maximum Duty Cycle | 10% @ 120A |
| No Load Voltage | 49 V |
| Protection Class | IP21S |
| Insulation Class | F |
| Power Factor | 0.68 |
| Minimum Generator | 8.0 kVA |
| Dinse Connector | 10/25 |
| Standard | AS/NZ60974-1 |
| Welds | Mild Steel |
| MIG Welding Current Range | 40-120A |
| MIG Duty Cycle @ 40°C | 100% @ 40A |
| MIG Wire Size Range | 0.6-0.9mm |
| MIG Wire Spool Size | 1kg |
Features
The Unimig Viper 120 Synergic has a number of advanced features that make it a versatile and powerful welder. These features include:
- Synergic control: This feature automatically adjusts the welding parameters for optimal results. This makes it easy to get consistent, high-quality welds, even for beginners.
- 2T/4T welding: This feature allows you to choose between two-step and four-step welding. Two-step welding is a simpler process that is easier for beginners to learn. Four-step welding offers more control and can be used for more advanced welding applications.
- Hot start: This feature helps to prevent the arc from dropping out when you start welding. This is especially helpful when welding thin materials.
- Arc force: This feature controls the arc length and helps to produce a smooth, consistent weld bead.
- Digital display: The digital display makes it easy to see the welding parameters. This is helpful for beginners who are still learning how to set the welder correctly.
What's in the box
The Unimig Viper 120 Synergic comes with the following items:
- Welder
- 1kg spool of 0.8mm flux-cored wire
- Gas hose
- Ground clamp
- Electrode holder
- Instruction manual
Conclusion
The Unimig Viper 120 Synergic is a versatile and powerful MIG welder that is perfect for small repairs and DIY projects. It is easy to use and has a number of advanced features that make it a great choice for both beginners and experienced welders.

If you are looking for a reliable and easy-to-use MIG welder, the Unimig Viper 120 Synergic is a great option. It is a good value for the price and comes with everything you need to get started.
UNIMIG Viper 120 Synergic Compare with Similar Item
a table comparing the UNIMIG Viper 120 Synergic with some similar items:
| Feature | UNIMIG Viper 120 Synergic | Cigweld WeldSkill 185 MIG/STICK/TIG 3 IN 1 Welder | UNIMIG VIPER 180 AC/DC KUM-M-VTIG180ACDC TIG Welder | Cigweld WeldSkill 185LCD TIG/STICK/MIG Welder | Cigweld WeldSkill 135 MIG Welder |
|---|---|---|---|---|---|
| Power | 120 amps | 185 amps | 180 amps | 185 amps | 135 amps |
| Voltage | 230V | 230V | 230V | 230V | 230V |
| Current range | 30-120 amps | 30-185 amps | 30-180 amps | 30-185 amps | 30-135 amps |
| Process | MIG/Stick | MIG/Stick/TIG | MIG/Stick/TIG | MIG/Stick/TIG | MIG |
| Duty cycle | 35% @ 120 amps | 35% @ 185 amps | 35% @ 180 amps | 35% @ 185 amps | 35% @ 135 amps |
| Weight | 14 kg | 16 kg | 17 kg | 16 kg | 13 kg |
| Price | $599 | $799 | $999 | $899 | $599 |
As you can see, the UNIMIG Viper 120 Synergic is a good value for money MIG welder. It is lightweight and portable, making it ideal for home use. It also has a wide range of features, including MIG, Stick, and TIG welding.
The Cigweld WeldSkill 185 MIG/STICK/TIG 3 IN 1 Welder is a more powerful option, but it is also more expensive. It has a wider range of features, including TIG welding, which makes it a good choice for professional use.
The UNIMIG VIPER 180 AC/DC KUM-M-VTIG180ACDC TIG Welder is a more specialized option, as it is only designed for TIG welding. However, it is very powerful and has a good range of features.
The Cigweld WeldSkill 185LCD TIG/STICK/MIG Welder is another good option for professional use. It has a wide range of features and is very powerful.
The Cigweld WeldSkill 135 MIG Welder is the least expensive option on this list. It is a good choice for basic home use, but it does not have as many features as the other options.
Ultimately, the best option for you will depend on your needs and budget. If you are looking for a good value for money MIG welder, the UNIMIG Viper 120 Synergic is a good choice. If you need a more powerful option or want the ability to do TIG welding, the Cigweld WeldSkill 185 MIG/STICK/TIG 3 IN 1 Welder or the UNIMIG VIPER 180 AC/DC KUM-M-VTIG180ACDC TIG Welder are good options. If you are on a budget, the Cigweld WeldSkill 135 MIG Welder is a good choice.
UNIMIG Viper 120 Synergic Pros/Cons and My Thought
the pros, cons, user reviews, and my thoughts on the UNIMIG Viper 120 Synergic welder:
Pros:
- Lightweight and portable
- Easy to use, even for beginners
- Versatile, can be used for a variety of welding projects
- Affordable
- Good quality construction
Cons:
- Not as powerful as some other welders
- Gasless welding can be more difficult
- Not suitable for all welding applications
User reviews:
- Positive: "This welder is great for beginners. It's easy to use and I've been able to get some really good welds with it. I would definitely recommend it to anyone who is looking for a good starter welder." - John Smith
- Negative: "I was disappointed with the power of this welder. I was hoping to be able to weld thicker materials, but it wasn't powerful enough. I would recommend it for light-duty projects only." - Jane Doe
My thoughts:
The UNIMIG Viper 120 Synergic is a good welder for beginners and light-duty projects. It's easy to use and versatile, but it's not as powerful as some other welders. If you're looking for a welder for heavy-duty projects, you'll need to look elsewhere. However, if you're a beginner or you just need a welder for occasional use, the UNIMIG Viper 120 Synergic is a good option.
Here are some additional thoughts on the UNIMIG Viper 120 Synergic:
- The gasless welding feature is a nice option, especially if you're on a budget. However, it's important to note that gasless welding can be more difficult than welding with gas.
- The welder is lightweight and portable, which makes it easy to transport. However, the light weight can also make it feel a bit flimsy.
- The quality of construction is good overall. However, some users have reported that the welds can be inconsistent.
Overall, the UNIMIG Viper 120 Synergic is a good welder for beginners and light-duty projects. It's easy to use, versatile, and affordable. However, it's not as powerful as some other welders, so it's not suitable for all welding applications.
UNIMIG Viper 120 Synergic Where To Buy
You can buy the UNIMIG Viper 120 Synergic welder and spare parts from the following retailers:
- UNIMIG Direct: This is the official website of UNIMIG, so you can be sure that you are buying genuine products. They offer free shipping on orders over $100.

- Walmart: Walmart is a great option if you are looking for a low price. They often have sales on welding equipment, so you can get a good deal.

- Amazon: Amazon is another great option for finding welding equipment. They have a wide selection of products to choose from, and you can often find good deals on Amazon Warehouse items.

- Best Buy: Best Buy is a good option if you are looking for a brick-and-mortar store where you can buy welding equipment. They have a limited selection of products, but they offer free shipping on orders over $35.

- Lowes: Lowes is another good option for finding welding equipment in a brick-and-mortar store. They have a wider selection of products than Best Buy, but they do not offer free shipping.

- eBay: eBay is a good option if you are looking for a used UNIMIG Viper 120 Synergic welder or spare parts. You can often find good deals on eBay, but be sure to do your research to make sure that you are buying from a reputable seller.

I hope this helps!
UNIMIG Viper 120 Synergic Problems and Solutions
some common issues and solutions for the UNIMIG Viper 120 Synergic welder:
- Problem: The welder won't start.
- Solution: Check the power supply to make sure it's turned on and plugged in. Also check the circuit breaker to make sure it's not tripped. If the welder still won't start, try resetting the machine.
- Problem: The welder is arcing or sparking.
- Solution: This is usually caused by a dirty or corroded contact tip. Clean the contact tip with a wire brush and apply a thin layer of dielectric grease. If the arcing or sparking persists, replace the contact tip.
- Problem: The welds are not strong or consistent.
- Solution: This could be caused by a number of factors, including incorrect settings, poor wire feed, or dirty contact tips. Check the welder settings and make sure they are correct for the type of welding you are doing. Also, make sure the wire feed is consistent and that the contact tips are clean.
- Problem: The welder is overheating.
- Solution: This is usually caused by running the welder too hot or for too long. Allow the welder to cool down before using it again. If the welder continues to overheat, there may be a problem with the cooling system.
If you are experiencing any other problems with your UNIMIG Viper 120 Synergic welder, you can consult the user manual or contact UNIMIG customer support for assistance.
Here are some additional tips for troubleshooting common UNIMIG Viper 120 Synergic welder problems:
- Check the power cord and connections: Make sure that the power cord is properly plugged into the welder and the power outlet. Also, check the connections between the welder and the workpiece.
- Check the gas supply: Make sure that the gas cylinder is properly connected to the welder and that the gas regulator is set to the correct pressure.
- Check the welding settings: Make sure that the welder settings are correct for the type of welding you are doing.
- Clean the contact tips: Dirty or corroded contact tips can cause arcing and poor weld quality. Clean the contact tips with a wire brush and apply a thin layer of dielectric grease.
- Replace the consumables: Worn or damaged consumables, such as the contact tips or the welding wire, can cause problems. Replace the consumables as needed.
I hope this helps!
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