Annealing / Heat Treating Induction Heaters
Last Updated: April 1, 2025
Description
Annealing and heat treating induction heaters are specialized devices used to heat metal objects. These heaters utilize an electrical source to drive alternating current through a coil, which in turn generates a magnetic field that heats the metal workpiece. The primary function of these heaters is to alter the physical and sometimes chemical properties of the metal, typically to increase ductility and reduce hardness, making the metal more workable.
Working Principle
Induction heaters operate on the principle of electromagnetic induction. When alternating current flows through the coil, it creates a rapidly changing magnetic field. This magnetic field induces eddy currents in the metal workpiece, causing it to heat up due to resistive losses. For ferrous materials, additional heating occurs due to hysteresis losses as the magnetic field repeatedly magnetizes and demagnetizes the iron crystals. This process is highly efficient because it directly heats the metal without any physical contact, allowing for precise control over the heating process. Induction heating is particularly useful because it is a non-contact method, ensuring that the heating is uniform and can be precisely controlled.
Applications
Induction heaters are used in a variety of applications. A specific example is the annealing of copper tubing for refrigeration, where a four-turn helical coil is used to heat the ends of the tubing for a precise duration to ensure uniform annealing. This process is crucial in preparing the tubing for further manufacturing steps. Induction heaters are also employed in processes such as metal forming, forging, shrink fitting, and assembly processes, as well as in welding and sealing applications.
Advantages over other Induction Heaters
Induction heaters used for annealing and heat treating offer several advantages. They provide a controlled application of heat to very specific areas, which results in faster process times and increased production efficiency. The process is highly efficient, leading to lower energy costs. Additionally, induction heating is a hands-free process that does not require operator skill, reducing the potential for human error and increasing consistency in manufacturing.
Limitations
One limitation of induction heaters is the initial high capital investment required to set up the system. Selecting the right induction heater is crucial, as overpowered systems can lead to increased costs, while underpowered systems can slow down production and extend the heating process. Additionally, the efficiency of the induction heating system is dependent on factors such as the characteristics of the part being heated and the design of the inductor.
Considerations
When considering the use of induction heaters for annealing and heat treating, it is important to evaluate the initial costs, which can be significant. Operating expenses are generally lower due to the high efficiency of the process, but this can vary depending on the specific application and system used. Durability and accuracy are strengths of induction heating, as the non-contact nature of the process reduces wear and tear on equipment. However, maintenance and replacement costs should be considered, particularly for components like coils and capacitors that may wear out over time.
from Ambrell Induction Heating Solutions
Equipped to operate over a broad frequency range from 150 to 400kHz the EASYHEAT-3542 is a versatile, reliable and efficient heating solution for applications requiring up to 4.2kW of power. EASYHEAT-3542 is frequency-agile, continuously optimizing the power delivered to the load for accurate,... [See More]
- Applications: Annealing or Heat Treating; Curing or Tempering; Melting; OEM / Custom (optional feature); Bond, Braze, Harden, Stake, Solder, More
- AC Voltage Required: 187 to 520
- Phase: Three Phase AC Voltage
- Output Power: 4.20
from Inductotherm Group
InductoVise ™ Adjustable Induction Heating System. Radyne ’s patented InductoVise ™ adjustable induction heating system combines the speed, quality, precision and repeatability of induction heating with the flexibility to easily accommodate a large variety of parts, sizes and... [See More]
- Applications: Annealing or Heat Treating
- Output Power: 0.00 to 10.00
from Ambrell Induction Heating Solutions
EKOHEAT induction heating systems for 15-40 kHz range provide reliable and repeatable solutions for heating larger parts when efficient heating of your part dimensions requires higher frequencies than our 10kHz models. Among the many typical applications are heat treating of steels, preheating for... [See More]
- Applications: Annealing or Heat Treating; Melting; OEM / Custom (optional feature); Heating Parts For Deeper Heat Penetration, Heat Treating Steel, Preheating For Forging Of Steel, Aluminum, Copper Or Brass, And Melting In Crucibles
- AC Voltage Required: 360 to 520
- Phase: Three Phase AC Voltage
- Output Power: 100.00
from Inductotherm Group
Banyard in-line induction Aluminium Tube Annealing systems are extremely compact, occupying a relatively small footprint over a minimal line length. They are designed to anneal, induction heat and water quench Aluminium tube ranging from 6mm to 30mm in diameter at speeds of up to 800m/min prior to... [See More]
- Applications: Annealing or Heat Treating
from Ambrell Induction Heating Solutions
EKOHEAT induction heating systems for 50-150 kHz range provide reliable and repeatable solutions for high-speed heating of smaller parts where the part geometry or the coil size requires high frequency for efficient heating. Among many typical applications are heat treating of steels, shallow case... [See More]
- Applications: Annealing or Heat Treating; Curing or Tempering; Melting; OEM / Custom (optional feature); Heat Treating, Shallow Case Depth Hardening, And Heating Of Steel, Aluminum, Copper Or Brass For Brazing, Shrink Fitting, Curing, Forming And Melting
- AC Voltage Required: 360 to 520
- Phase: Three Phase AC Voltage
- Output Power: 15.00
from Inductotherm Group
Boost Heating Systems are perfectly adapted for rapid changes of steel temperature during the thermal cycling in annealing furnaces. Induction heating equipment can also be used for preheating the strip furnace entry by effectively “boosting ” the capacity of the line. Boost Heating... [See More]
- Applications: Annealing or Heat Treating
- Output Power: 7000.00
from Ambrell Induction Heating Solutions
EKOHEAT induction heating systems for 50-150 kHz range provide reliable and repeatable solutions for high-speed heating of smaller parts where the part geometry or the coil size requires high frequency for efficient heating. Among many typical applications are heat treating of steels, shallow case... [See More]
- Applications: Annealing or Heat Treating; Curing or Tempering; Melting; OEM / Custom (optional feature); Heat Treating, Shallow Case Depth Hardening, And Heating Of Steel, Aluminum, Copper Or Brass For Brazing, Shrink Fitting, Curing, Forming And Melting
- AC Voltage Required: 360 to 520
- Phase: Three Phase AC Voltage
- Output Power: 180.00
from Inductotherm Group
Radyne ’s Bright Annealing Tube Line fits directly inline with today ’s high-speed drawing and rolling lines, making them the preferred choice for lean, agile manufacturing. Utilizing a modular and expandable design, Radyne Bright Annealing Tube Systems meet virtually any line speed,... [See More]
- Applications: Annealing or Heat Treating
from Ambrell Induction Heating Solutions
EKOHEAT induction heating systems for 15-40 kHz range provide reliable and repeatable solutions for heating larger parts when efficient heating of your part dimensions requires higher frequencies than our 10kHz models. Among the many typical applications are heat treating of steels, preheating for... [See More]
- Applications: Annealing or Heat Treating; Melting; OEM / Custom (optional feature); Heating Parts For Deeper Heat Penetration, Heat Treating Steel, Preheating For Forging Of Steel, Aluminum, Copper Or Brass, And Melting In Crucibles
- AC Voltage Required: 360 to 520
- Phase: Three Phase AC Voltage
- Output Power: 20.00
from Inductotherm Group
The Inductoheat ® ACR Copper Tube Annealing system is a complete line solution designed for ease of use, efficient operation and high-speed production. This high-speed annealing system can process up to 600 m/minute in a “Basket to Basket application or up to 200 m/minute when going from... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 6 to 30
- Output Power: 1200.00
from Ambrell Induction Heating Solutions
Equipped to operate over a broad frequency range from 150 to 400kHz the EASYHEAT-0112 is a compact and efficient heating solution for applications requiring up to 1.2kW of power. EASYHEAT-0112 is frequency –agile, continuously optimizing the power delivered to the load for accurate, repeatable... [See More]
- Applications: Annealing or Heat Treating; Curing or Tempering; OEM / Custom (optional feature); Bond, Braze, Stake, Solder, Harden, More
- AC Voltage Required: 117 to 220
- Phase: Single Phase AC Voltage
- Output Power: 1.20
from Inductotherm Group
Radyne ’s Fastener Heat Treating equipment delivers uniformity, consistency and increased controllability that results in superior quality fasteners. This complete system is adjustable for a wide range of fastener/bolt lengths and diameters, and is capable of production rates of up to 600... [See More]
- Applications: Annealing or Heat Treating
- AC Voltage Required: 440 to 480
- Phase: Three Phase AC Voltage
- Output Power: 100.00
from Inductotherm Group
Thermatool ™ Full Body Annealers support both in-line and off-line solid-state induction heating of many different varieties of tube, pipe, and bar. Precise induction heating, like that provided by Thermatool ™ Full Body Annealers, is critical for post-processing applications such as... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 10 to 150
from Inductotherm Group
Inductotherm has pioneered reliable heating systems for high-frequency galvannealing. High-frequency tests have shown that rapid heating, controlled holding and rapid cooling of the strip enhance the development of the required intermetallic phase and thus the build-up of the appropriate metallurgic... [See More]
- Applications: Annealing or Heat Treating
- Output Power: 5000.00
from Inductotherm Group
The Thermatool ™ Mpower ™ is a compact, rugged Solid State HF Generator and power supply for heating applications. With its small footprint, the Mpower ™ power supply conserves floor space while ensuring reliable performance even under adverse conditions. This product can be used... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 80 to 300
- Output Power: 300.00
from Inductotherm Group
The Inductoscan ® Induction Induction Heat Treating Scanning System is a unique induction heat treating solution. It accommodates a wide range of power supplies, multiple spindle configurations and a wide array of automation options to optimize the heat treating process. This flexible system can... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 3 to 200
- Output Power: 50.00 to 800.00
from Inductotherm Group
The Statiscan ® II Induction Heat Treating Scanning System is a unitized vertical hardening system with two standard scanning spindles. This platform is designed for medium duty heat treating and tempering of various parts and applications. This flexible machine can be configured for multiple... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 10 to 200
- Output Power: 50.00 to 300.00
from Inductotherm Group
The Statiscan ® IV Induction Heat Treating Scanning System is a unitized vertical hardening system with four standard scanning spindles. This flexible platform is designed for medium duty heat treating and tempering of various parts and applications. This system can be configured for multiple... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 10 to 200
- Output Power: 50.00 to 300.00
from Inductotherm Group
FlexScan ® induction scanners break new ground by delivering the most affordable scanner in the marketplace. Initially designed for heat-treating processes for both in-place or scan, the Radyne FlexScan ® Induction scanner can be adapted for different heat-treating and brazing applications. [See More]
- Applications: Annealing or Heat Treating
from Inductotherm Group
Process spring wire at high speeds: the Radyne Spring Wire Line is the world ’s fastest Induction Tempering Spring Wire System, setting the industry standard for speed. Radyne high speed Spring Wire Systems operate at line speeds up to 590 ft./min [180 m/min], producing up to 6600 lb./hr [3000... [See More]
- Applications: Annealing or Heat Treating
from Inductotherm Group
CrankPro ® Induction Heating Systems utilize patented SHarP-C ™ (Sstationary Hardening Pprocess for Crankshafts) hardening technology, which eliminates workpiece rotation during the induction heat treating process. This revolutionary approach enables faster part production while delivering... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 10 to 30
- Output Power: 150.00 to 450.00
from Inductotherm Group
IROSS ™ Line Frequency Systems contain flux concentrators that utilize patented technology for yielding superior temperature uniformity. These units are used in a wide variety of industries, including: Automotive, Off-Road, Construction and Electric Motor. IROSS ™ Line Frequency Heating... [See More]
- Applications: Annealing or Heat Treating
- Phase: Single Phase AC Voltage
from Inductotherm Group
Mill Roll Hardening Systems are becoming increasingly popular with the expanding development of cold mills which subject the rolls to high stresses. These systems are used to obtain rolls with high strength and resistance to surface wear. Induction heating has greatly contributed to improvements in... [See More]
- Applications: Annealing or Heat Treating
from Inductotherm Group
The Inductoscan ® XL Modular Heat Treating Scanning System is a heavy-duty induction heating system designed for the most demanding parts. This system is built to accommodate the material handling systems and process requirements associated with large parts. This flexible system can be... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 3 to 200
- Output Power: 50.00 to 800.00
from Inductotherm Group
Radyne and the Inductotherm Group leverages over 60 years of experience in heat treating processes, for hardening, tempering, and annealing, induction systems integration and machine design to support heat treaters worldwide with Modular Heat Treating Systems that deliver precision heating and... [See More]
- Applications: Annealing or Heat Treating
- Output Power: 5.00 to 50.00
- AC Voltage Required: 240 to 480
- Output Frequency: 20 to 400
from Inductotherm Group
The Inductoscan ® VSM95 Induction Heat Treating Scanning System is ruggedly designed for high-volume scan hardening of most cylindrical parts up to 400 lbs. and as long as 80 in. It can be customized to perform various heat treating operations such as; scan, single-shot, lift/rotate and linear... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 3 to 200
- Output Power: 135.00 to 300.00
from Inductotherm Group
Radyne Offshore Clam Coils are designed for use in offshore pipe laying applications and utilized for a number of pipe heat treatment tasks. The coil is manufactured in a non-conductive composite frame to support the water-cooled coil wraps with an over center clamp to manually clamp the clam-type... [See More]
- Applications: Annealing or Heat Treating
from Inductotherm Group
Thermatool ™ Quench and Temper lines can process 2, 5, 10, 15, 20 or 30 tons per hour for Austenitizing, Quench and Temper utilizing induction, gas, or electric furnaces coupled with the Thermatool ™ Precision Quench ™. Thermatool ™ Quench and Temper lines feature Solid State... [See More]
- Applications: Annealing or Heat Treating; Melting
- Output Frequency: 0.2000 to 10
- Output Power: 50.00 to 38000.00
from Inductotherm Group
Rail Hardening systems utilize induction heating to effectively harden rails. These systems include pre-programmed ramping of power to homogenize the temperature over the length of the rail, and retractable inductor carriage for ease of maintenance. Rail Hardening Systems have specially designed... [See More]
- Applications: Annealing or Heat Treating
from Inductotherm Group
Thermatool ™ in-line Seam Annealing / Normalizing equipment is designed to effectively Post Weld Heat Treat (PWHT) HF welded tube and pipe across a wide range of product diameters and wall thicknesses. To provide rigorous quality control and to ensure process repeatability, Thermatool ®... [See More]
- Applications: Annealing or Heat Treating
- Output Frequency: 0.5000 to 6
- Output Power: 200.00 to 3000.00
from Inductotherm Group
IROSS ™ Fluxmanager ® Pipe-End Heating Units are designed for heating a variety of tubular products. These systems utilize patented Fluxmanager ® induction heat treatment technology that yields superior temperature uniformity compared to conventional medium frequency designs. [See More]
- Applications: Annealing or Heat Treating
- AC Voltage Required: 350 to 600