Therwen Flux Core Gasless Nozzle Tips Kit KP1939-1 review

? Want a dependable, ready-to-replace kit that keeps your flux core welding sessions moving without fuss?

Product Overview

You’re looking at the Thermwen Flux Core Gasless Nozzle Tips Kit KP1939-1 Flux Core Welder Mig Welder Flux Welder Contact Tips Gasless Nozzle Gas Diffusers for Mig Welder Mig Gun (24 Pcs,0.035″(0.9mm) kit). This package aims to give you a practical set of spare parts so you can replace worn tips and nozzles quickly and keep your workflow steady. In this review, you’ll find detailed information about what’s included, how the parts perform, and whether the kit suits your welding projects.

What this kit is for

You’ll use this set when you need to replace worn contact tips, gasless nozzles, or gas diffusers on a flux core MIG gun. It’s targeted at hobbyists, DIYers, and light-to-medium duty welders who rely on flux core (gasless) welding and want an affordable replenishment pack of consumables.

What’s in the Box

You’ll want to know exactly what arrives in the kit so you can plan replacements and maintain your torch without interruptions. The package is straightforward and focused on essentials.

Package contents breakdown

You get a total of 24 pieces: 2 flux core gasless nozzles KP1939-1, 20 conductive tips 0.035″ (0.9mm), and 2 gas diffusers. That quantity should cover several sessions of typical hobby or light professional work before you need another refill.

Quick practical note

You’ll find the mix of parts makes this kit useful for both immediate swaps and to keep spares in your toolbox. The high count of contact tips addresses the most frequently replaced item, which helps you save time and avoid downtime on projects.

Specifications Table

You’ll find this table helpful to quickly compare the key specs and contents at a glance.

Item	Quantity	Size / Model	Purpose
Flux core gasless nozzle (KP1939-1)	2	KP1939-1	Directs molten metal and shields the arc in gasless operation
Conductive contact tips	20	0.035″ (0.9mm)	Transfers welding current to the wire and guides wire feed
Gas diffusers	2	Universal fit for gasless nozzles	Stabilizes flow and helps prevent spatter accumulation
Total pieces	24	—	Spare consumables set for flux core MIG guns

Materials and Build Quality

You’ll want parts that last under heat and spatter. The kit is described as made from quality materials with wear resistance, high strength, and heat resistance. That matters because contact tips and nozzles take the most abuse.

Contact tip construction

The contact tips are conductive and sized at 0.035″ (0.9mm). You’ll find that consistent internal diameter matters for stable arc and wire feed. These tips aim to reduce arc heat loss and maintain a steady weld.

Nozzle and diffuser durability

The nozzles and gas diffusers are built to resist deformation at higher temperatures. You’ll get components that won’t warp quickly under normal flux core loads, which helps preserve weld quality and reduces the frequency of replacements compared with cheaper, poorly formed parts.

Compatibility and Fit

You should always verify fit before assuming compatibility. This kit markets compatibility with big-name machines and a range of MIG guns, which is helpful when you’re using different brands.

Which machines are compatible

The kit is claimed compatible with Lincoln, Forney, Chicago Electric, and other common brands. If you own a similar-style MIG gun for flux core welding, you’ll likely be able to use these parts without modification.

Fit tips

You’ll check the thread and inner diameter to confirm fit. The KP1939-1 nozzle and generic 0.035″ tips typically work well on guns designed for those sizes, but if your gun is an uncommon model, verify part numbers or bring an old tip along to match it physically.

Performance and Welding Results

You’ll care most about how the kit performs during actual welding. Performance depends on how well the tips transfer current, how the nozzle controls spatter, and how the diffusers maintain gasless arc stability.

Arc stability and wire feeding

You’ll notice that a correctly sized 0.035″ tip helps maintain stable wire feeding and consistent arc length. That stability translates into cleaner beads and fewer burnbacks if your feed tension and drive rollers are set properly.

Spatter control and bead appearance

You’ll see improved bead appearance compared to overly worn tips and damaged nozzles. While flux core welding inherently produces more spatter than gas-shielded MIG, these parts are designed to reduce arc heat loss and keep spatter from prematurely fouling the contact tip.

Heat and Wear Resistance

You’ll want tips and nozzles that resist heat cycling and spatter buildup. The product description emphasizes wear resistance and high strength, which are critical for flux core use.

Thermal performance in practice

During repeated welding runs, you’ll see that the alloy and fit of the components help the nozzle maintain shape and keep the tip seated properly. That means less wobble, fewer loose connections, and a longer effective life for the tip/nozzle assembly.

Wear and replacement cadence

You’ll typically replace contact tips more frequently than nozzles. With 20 contact tips included, expect multiple tip changes before the nozzles or diffusers need swapping, depending on how intensively you weld and how much spatter accumulates.

Installation and Replacement Guide

If you need to change a tip or nozzle, this kit is straightforward to work with. You’ll appreciate quick swaps when you’re mid-project.

Replacing the contact tip

You’ll remove the nozzle first, slip out the old tip, thread the new 0.035″ tip into place, and then reinstall the nozzle. Make sure the wire feeds smoothly through the new tip before you fire the gun.

Replacing the nozzle and diffuser

You’ll unscrew the worn nozzle, clean the shroud area to remove spatter, then screw in the new KP1939-1 nozzle and seat the diffuser as needed. Cleaning the torch throat before installing a new nozzle helps you avoid trapped spatter that can cause overheating or misalignment.

Portability and Storage

You’ll like that this kit is compact and light. It’s designed to be portable so you can carry spare parts to a job or store them neatly in your toolbox.

Ease of storing in your toolkit

You’ll slip the small parts into a compartment or keep the entire kit in a labeled bag. The physical size makes it easy to keep spares at the bench or in a mobile rig without taking up much space.

Organization tips

You’ll label or separate contact tips from nozzles and diffusers so you avoid grabbing the wrong part in a hurry. A small parts organizer or resealable bag helps you manage the 24 pieces efficiently.

Use Cases and Project Types

You’ll find this kit is most useful for specific types of welding and user profiles. It’s not for every situation, but it matches some very common scenarios.

Best-fit projects

You’ll find this most useful for automotive repair, metal fabrication, fence and gate work, and general hobbyist projects that use flux core wire. It suits MIG guns built for 0.035″ wires and gasless operation.

Where it’s less ideal

You’ll avoid using this kit for fine, precision welding where smaller contact tips or gas-shielded processes are required, or for very heavy industrial welding needing higher-spec OEM parts.

Pros and Cons

You’ll want a clear list to evaluate whether this kit matches your needs. Here are strengths and trade-offs based on practical use.

Pros

• You’ll get a large number of contact tips (20) which addresses the most common replacement need.
• You’ll receive full replacements (nozzles and diffusers) to restore worn torch assemblies.
• You’ll benefit from parts designed with heat and wear resistance in mind.
• You’ll appreciate the kit’s portability and toolkit-friendly size.

Cons

• You’ll need to confirm exact fit for some unusual or proprietary MIG guns.
• You’ll find that heavy industrial usage may outpace the durability of aftermarket parts compared with OEM options.
• You’ll sometimes need to clean spatter thoroughly for optimal performance, which is a routine maintenance step.

Comparison with OEM and Alternatives

You’ll often have the choice between aftermarket kits like this and OEM parts. Understanding differences helps you make cost-effective choices.

Cost vs OEM

You’ll usually pay less for an aftermarket kit than for OEM individual parts. That makes it a strong value for general maintenance and saving money during frequent tip swaps.

Performance vs OEM

You’ll sometimes see slightly better or more consistent performance from OEM parts designed precisely for your gun. But for many users, this kit offers acceptable performance and value, particularly if you keep spares on hand.

Maintenance and Longevity Tips

You’ll keep the kit functioning longer by following a few simple habits. These tips will minimize downtime and extend component life.

Routine cleaning

You’ll clean spatter from the nozzle and throat area after each session. Use a brass wire brush and a nozzle cleaner to prevent buildup that shortens the life of contact tips.

Check and replace before failure

You’ll check the tip regularly for signs of erosion, and replace it before it leads to burnbacks or poor arc stability. Having tips on hand from this kit means you can swap them fast.

Proper wire feed settings

You’ll set your wire feed speed and tension correctly to prevent bird-nesting or tip wear from excessive drag. Consistent feeding reduces tip burring and premature replacement.

Troubleshooting Common Issues

Even with quality parts, you’ll sometimes run into problems. Here are common issues and how you can address them.

Burnbacks or wire sticking

You’ll check tip wear, feed tension, and drive roller alignment. Replace worn contact tips and adjust feed tension to reduce burnbacks.

Excessive spatter

You’ll clean the nozzle and diffuser and ensure the tip isn’t worn or improperly seated. Excessive spatter often results from worn or deformed nozzles trapping hot slag.

Poor arc stability

You’ll replace the contact tip if it’s eroded or misshapen. Also confirm that wire diameter matches the tip (0.035″) and that the wire is not contaminated with oil or rust.

Safety Considerations

You’ll prioritize safety whenever you handle consumables or work on your welding torch. These parts help, but safe practices are essential.

Safe handling of hot parts

You’ll allow the torch to cool before swapping tips or nozzles. Always wear gloves when changing hot components and avoid touching recent weld splatter.

Inspect for damage

You’ll examine replacement parts for cracks, severe deformation, or threads that won’t seat properly. Don’t use components that look compromised, as they can cause poor performance or unsafe conditions.

Frequently Asked Questions

You’ll likely have questions before you buy. Here are answers to common concerns.

Will these tips work with my brand of welder?

You’ll find they’re compatible with Lincoln, Forney, Chicago Electric, and other standard MIG guns that accept KP1939-1 nozzles and 0.035″ tips. Check your manual or compare part geometry if you have a proprietary torch.

How long do these tips last?

You’ll see life vary by use: light hobby use can extend tips for many hours, while heavy daily work will consume tips faster. Because the kit includes 20 tips, you’ll have ample spares for multiple sessions.

Can I use these tips for gas-shielded MIG?

You’ll generally use these for flux core (gasless) systems. Gas-shielded MIG often uses different nozzles and diffusers optimized for shielding gas flow; confirm compatibility before using them on a gas MIG setup.

Final Verdict

You’ll find the Thermwen Flux Core Gasless Nozzle Tips Kit KP1939-1 Flux Core Welder Mig Welder Flux Welder Contact Tips Gasless Nozzle Gas Diffusers for Mig Welder Mig Gun (24 Pcs,0.035″(0.9mm) kit) to be a practical, budget-friendly option for maintaining flux core MIG guns. The kit’s strong point is the high number of contact tips, which are the items you change most often. The included nozzles and diffusers round out the package so you can refresh the most critical parts of your torch on the spot.

You’ll appreciate the value, especially if you do regular DIY work or light professional welding where having spares matters more than paying OEM prices. If you require rugged industrial-grade longevity or have a proprietary torch that needs exact OEM parts, you’ll weigh that against the savings and convenience this kit offers.

If you want a concise recommendation: if you weld with 0.035″ flux core wire and want a ready supply of consumables to minimize downtime, this kit is worth considering. You’ll get practical parts, decent durability, and a setup that keeps your welding projects moving.

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