The Ultimate Guide to Choosing Induction Heating Machines

Jun. 16, 2025

How Experts Choose Induction Furnaces - Amelt Corporation

Companies that deal with molten metal know that they have to choose the best induction furnace to meet the needs of their customers. The conditions under which the melt metals determine the quality of their products. Therefore, you have to be careful when choosing your equipment. Choosing the right heating equipment is not something that you can take lightly. Companies can easily experience problems because of the mistakes they made when buying, so you’ll want to avoid that scenario at all costs.

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When you start shopping for these items, you will notice that there’s a huge variety of equipment and purpose. In addition to that, these furnaces have various heating capacities. The best approach would be to think about the needs of your company and come up with the features that you would want in a metal melting furnace. Here are some tips on how experts determine the best options.

Know the Melting Points of Different Metals

An induction furnace is meant to heat to a specific limit. You have to find out if the heat will be enough to melt all your materials. You will notice that when it comes to metals, every type has a different melting point. For instance, steel melts at 1,370 degrees Celsius. This means that if you are melting steel, you will not be looking for a gold or copper melting furnace.

No matter the kinds of metals you want to melt, there will always be a furnace that is meant for them. It is because of this reason that experts choose to focus on other essential features after they are sure that they will have enough heat for their work.

Look For High-Quality Furnaces

Experts often look at the quality of every induction furnace before buying it. They want to make sure that the materials used to make it will be suitable for their own purposes. Some furnaces are made from the best materials, but others may not be what you expect. Because of that, take time to look at how they have been made to know if they will be helpful for your work.

Quality is more important when you are looking for a used furnace because you never know the condition that it will be in. Once you find a used induction furnace for sale, check to make sure that all the parts are working optimally. You may also want to ask if they have been repaired and if they have any other faults. You should not agree to buy something that is worn out just because it comes at a lower price.

Think About the Melting Capacity and Energy Needs

The size of an induction furnace will also determine its suitability for your company because every company has its unique needs. You will notice that some of these furnaces are as small as 60gr (2.5 ounces) while others are as big as 25,000Kg (55,000 lbs.) Your choice should be determined by the amount of metals that you want to melt.

As for power suppliers, you have to know how much energy is needed to keep the induction heating equipment running. You will notice that while some of the equipment need high voltages, others only need a moderate supply of power. The main point is to ensure that you have enough power to run your machines and that you can produce enough molten metals to meet your demand.

10 Considerations When Selecting an Induction Heating System

Induction heating has considerable advantages over other common heating methods in specific applications. Is yours one of those applications?

Induction heating offers many benefits to manufacturing processes because it is a rapid, energy-efficient, flameless method of heating electrically conductive materials. A typical system involves an induction power supply, workhead with a copper coil and a chiller or cooling system. Current flows through the coil to create an electromagnetic alternating field. When a conductive part is placed inside the coil, current is induced to run through it. Current flow combined with the resistance properties of the conductive part results in heat generation.

10 Selection factors to consider

Your Part’s Material

Induction directly heats conductive materials such as metals. Nonconductive materials are sometimes heated with a conductive susceptor. Due to hysteresis, magnetic materials are heated more easily than nonmagnetic materials; consequently, nonmagnetic materials often require more power. Metals with high resistivity like steel heat quickly, while low-resistivity metals like copper or aluminum require more heating time.

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Depth of Heating Penetration

The induced current will be most intense on the surface of your part. In fact, more than 80% of the heat produced in the part is produced on the “skin,” or surface. Consequently, larger parts and parts that require through-heating take more time to heat than those that are thin or small.

Operating Frequency

Lower-frequency, higher-power systems are generally suited for heating larger parts that require through heating. Lower-power, higher-frequency systems are often the right choice for surface heating. As a general rule, the higher the frequency, the shallower the heating of the part.

Applied Power

The output power of your induction heating power supply determines the relative speed at which your part is heated. The mass of the part, rise in temperature and heat losses from convection and conduction need to be considered. Often, the induction equipment manufacturer can help you make this assessment.

Rise in Temperature Required

Induction can generate a significant change in temperature, but, generally speaking, more power is needed to accommodate a significant temperature change and will impact your power-supply choice. The rate of temperature change also affects your power-supply choice. The faster the rate of change, the more significant the power requirement.

Coil Design

Your coil, which is generally water-cooled and made of copper, needs to follow the shape of your part and take the variables of your process into account. An optimal coil design will deliver the right heat pattern to your part in the most efficient way. A poorly designed coil will heat your part more slowly and deliver an improper heating pattern. Flexible coils are now available and work well with large parts and unique part geometries.

Coupling Efficiency

The part being closely coupled with the coil elevates the flow of current, which increases the amount of heat generated in the part. Coupling enables faster and more efficient heating, which can increase manufacturing efficiency. Poor coupling has the opposite effect.

Your Facility and the Footprint

Induction requires cooling from a chiller or cooling system. Lower-power systems generally require a compact water-to-air heat exchanger, while a higher-power system may require a larger water-to-water heat exchanger or chiller. Additionally, you will need space for the induction heating power supply and workhead. Generally speaking, an induction system will save considerable space over an oven, especially when you consider that the workhead can be placed a significant distance away from the power supply. Of course, you also need to be sure your facility can handle the amount of power the system requires.

Additional Heating Requirements

Will you need to measure and store heating data? Some induction solution providers can offer a full system that includes an optical pyrometer and temperature-monitoring software so such data can be recorded and stored. A comprehensive solution can lead to a smooth installation and start-up.

Industrial Expertise

Many induction manufacturers have expertise with certain applications, and if they’ve worked with your application, it will provide peace of mind. Additionally, some providers offer laboratory testing and a tailored system recommendation based on your heating requirements. This type of service takes the guesswork out of selecting a system and helps you account for the aforementioned factors.

In conclusion, induction heating has considerable advantages over other common heating methods. Buying the right system for your application’s needs and ensuring it meets any needs you may have for it in the future will help your company fully benefit.

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