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KF-100A Submerged Arc Flux Holding Oven

Submerged Arc Flux Holding OvenAt Keen, we offer a wide range of welding consumable storage ovens to satisfy the most demanding welding requirements. Our
high-performance products are manufactured exclusively in the USA at our facility in Hammond, Louisiana. We are currently one of the largest manufacturers of welding electrode and welding flux ovens in North America, and proudly serve welding industry professionals worldwide.

Product Description:

The Keen KF-100A is a portable, hopper-style, electric oven that is used for storing granulated submerged arc welding flux. It has a 125 lb. storage capacity and a temperature range of 150°F-300°F (38°C-149°C).



Flux Capacity: 125 lbs. (56.7 kg) flux
Volts: 120V & 240V.
Watts: 500W
Thermostat: Dial Adjustable
Temperature: Range 150°- 300°F (38°-149°C)

Insulation: 2" (5.08 cm) Thermal Insulating Wool
Interior Dimensions:
12" (30.48 cm) x 16" (40.64 cm) x 22" (56 cm)
Shipping Weight: 166 Lbs. (75.30 kg)

Shown with optional slag screen

Optional slag screen


Frequently Asked Questions:

How is the KF-100A subarc flux storage oven used in the field?

Subarc flux is top-loaded by way of a removable lid and discharged through a slide valve located on the bottom of the unit. A container placed by the user beneath the hopper catches the granulated flux as it is dispensed. Flux temperature inside the oven is regulated by a field adjustable dial thermostat with on-indicating light, and monitored with a bimetal thermometer. The KF-100A flux oven is equipped with lifting lugs. This oven may be used as a portable oven or may be readily detached from its carrier and mounted directly to the welding manipulator.

Why choose the KF-100A flux oven over a different model offered by Keen?

The KF-100A is the smallest flux oven in our range, and is an excellent choice for subarc welding operations where portability is a necessity. This particular unit is very easy to use, light in weight and can be moved from station to station with ease using the heavy-duty stand and wheels. Each subarc operation is unique- some customers centrally locate our large flux ovens, and many other customers enjoy the versatility of the KF-100A by having multiple units on hand spread among welding stations. The KF-100A flux oven is easily adapted to a variety of workflows, and particularly allows mobile operations to easily transport just the right amount of ovens they need for a particular job.

Do Keen Ovens come with a manufacturer’s warranty?

Yes. Our ovens have a 1 year manufacturer’s limited warranty.

What is granulated submerged arc welding flux?

Used as a protective layer in the process of submerged arc welding (SAW), subarc flux is a granulated, fusible material consisting of lime, silica, manganese oxide, calcium fluoride, and other compounds. The flux forms a hardened layer after it is heated and becomes molten. In this melted state the flux becomes conductive, thus enabling it to supply a constant current between the electrode and the welding work. The remainder of the flux is recovered and reused, unless it has become contaminated.

The granular flux used in SAW serves several functions. In addition to providing a protective cover over the weld, the flux shields and cleans the molten puddle. The flux also affects the chemical composition of the weld metal, the weld bead shape, and the mechanical properties of the weld. Another function of granular flux is to act as a barrier that contains and concentrates the heat into the weld area thus enabling deeper weld penetration.

Why does granulated submerged arc welding flux need to be stored in an oven?

In order to answer this question, it is pertinent to describe the four types of welding fluxes that are commonly available: fused, bonded, agglomerated and pre-mixed fluxes.

Fused — this type of flux is non-hygroscopic (does not absorb moisture from the air). Any surface moisture on the particles can be removed at a low temperature oven setting of 300°F.

Bonded — this type of flux is hygroscopic (absorbs moisture from the air) and is comprised of a combination of dry ingredients that are glued together with a liquid binder, then baked at a low-oven temperature.

Agglomerated — this type of flux is hygroscopic and is manufactured the same way as bonded fluxes only a ceramic binder is used instead of a liquid binder.

Pre-Mixed — this type of flux is hygroscopic and is simply a combination of two or more bonded or agglomerated fluxes.

Just as stick welding electrodes readily pick up moisture from the surrounding atmosphere, the same applies to bonded welding fluxes that are comprised mostly of dry, powdered ingredients. As described above, the purpose of flux is to clean and shield the weld area from impurities. If moisture has contaminated the flux, hydrogen is released into the metal when heat is applied. When the weld cools, it can become brittle, crack and/or develop pinholes. Moisture-contaminated flux can also accelerate corrosion to certain metals like aluminum and must be kept dry throughout the welding process.

Keen welding flux holding ovens and rebake ovens are an indispensable addition to any subarc welding operation to help ensure quality welds. Our flux holding ovens and rebake ovens are suitable for almost any flux heating application that is required for today’s professionals.

How do I store unopened packaging of sub-arc welding flux?

Submerged arc welding flux is available in a wide-variety of packaging and in various amounts according to how much is used, bulk pricing, etc. It is commonly purchased in single wall plastic or multi-wall plastic bags, paper bags, bulk bags with liners, plastic pails and steel drums. It is recommended by most manufacturers that users follow basic guidelines when storing unopened packaging. For example, storage of unopened bags must be indoors with moderate relative humidity below 70% (RH suggestions vary among flux manufacturers) and within a temperature range of 48°F-122°F. A bag of welding flux is the least durable form of packaging available, and care must also be taken to avoid puncturing or tearing the packaging. Avoidance of condensation is critical and is the main objective when storing unopened bags of welding flux. The more durable plastic pails and steel drums are tightly sealed and are often stored outdoors. Care must be taken to protect the containers from rain and snow. Again, condensation and moisture is damaging to flux and must be avoided. Labeling must never be removed from flux packaging while in storage.

Once I opened packaging, how should I store new, unused flux?

As discussed above, sub-arc welding flux is hygroscopic and once exposed to the atmosphere it will absorb moisture; the amount absorbed depends upon the relative humidity in the air and the period of time the flux remains exposed. It is recommended by most manufacturers of welding flux that unused amounts be stored at elevated temperatures in an oven to stave off moisture and ensure quality welds. Keen flux holding ovens are designed to hold welding flux that has not been exposed to moisture (either new or recycled) in order to preserve quality and maintain performance of the flux in operation.

What is the procedure for recycling welding flux and what are slag screens?

After the weld is completed flux that is not consumed can be collected and recycled to the flux oven hopper. However, contained in the non-consumed flux may be some contaminants such as slag, metal, mill scale, grindings, etc. that need to be filtered out before the flux is introduced back into the hopper to mix with new flux. Many manufacturers of sub-arc flux recommend maintaining a ratio of new flux to recycled flux. Some suggest adding 20% new flux by weight to recycled flux, others recommend a rule of thumb that one part new flux be added to three parts reused. it is always best to check with the manufacturer of your consumable for guidelines.

Keen flux oven slag screens are designed to be a sieve for filtering out contaminants in reused flux as it is being poured back into the flux oven hopper. The hole size on our flux oven slag screens is standard, but we can adjust the screen hole size if you have a different requirement. The slag screens are a fixed size according to the flux oven with which they are used.

Download KF-100A Spec Sheet (PDF)


For more information or to find a Keen distributor near you:
Call: (888) 512-2870 (USA only)
Email: Sales@keenovens.com


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