Brazing Carbide-Steel Tool with Induction

Brazing Carbide-Steel Tool with Induction Objective: Provide a solution to this steel-carbide brazing application Material • Body 10mm; carbide tip 57 x 35 x 3 mm • Braze shim • Braze flux white Temperature: 750°C (1382ºF) Frequency: 150 kHz Equipment DW-UHF-20KW induction heating system, equipped with a remote heat station containing (2) 1.0 μF capacitors (for a total of 0.5 μF) A 4.5" helical induction heating coil designed and developed specifically for this application. Process: The body shim and carbide are cleaned and braze flux as applied to the entire surface of the assembly. The parts are placed together in the induction coil. Two ceramic tubes are then placed thru the coil opposing each other to hold the parts during heating. The flux on the parts is allowed to dry before heating. The induction heating power is applied until the braze flows in the joint. Results/Benefits • targeted heating of the braze joint is efficient • flameless process is more precise, controllable • results are reproducible

Induction Brazing Copper Pipe Fittings

Induction Brazing Copper Fittings Objective: Copper 'tees' and 'ells' are to be brazed to the aluminum body of a refrigeration valve Material: customer's valve copper fittings braze Temperature: 2550 ºF (1400°C) Frequency: 585 kHz Equipment: DW-UHF-10kw induction heating system including a workhead containing two 1.5μF capacitors (total 0.75μF) and a three-turn helical coil Process: The valve is placed inside the coil and RF induction heating power is applied until the part is heated to the required temperature and the braze is seen to flow into the joint. Two tube sizes were run using the same induction heating system settings with differing cycle times. Results/Benefits • energy is applied only to the zone to be heated • heating of the joint/braze is uniform and repeatable

induction brazing stainless steel to steel

High frequency magnetic induction brazing stainless steel to steel process

HLQ team was provided with 2 different parts to be brazed in our test laboratory. Objective: Induction Brazing of a 0.15’’/ 3.81mm stainless steel pin to a steel base. Equipment:  DW-UHF-6KW-III handheld induction brazing system  Industry: Appliances & HVAC Materials: Steel hexagon (base 1’’/ 25.4 mm diameter; 0.1’’/ 2.54 mm wall thickness) A stainless steel pin (0.15’’/ 3.81 mm) Other Materials:  All-purpose black brazing flux Power: 1.43 kW Temperature: 1400 °F/ 760°C Time: 8 seconds Process: The two workpieces were carefully positioned together. All-purpose induction brazing black flux was added because it is ideal for high-temperature applications where rapid, localized heating is needed. The process of induction brazing was performed successfully within 8 seconds by using the  DW-UHF-6KW-III handheld induction brazing system, producing the induction heating power of 1.43 kW at 1400 °F/ 760°C.

Induction inline wire heating process

Objective Induction Heat several different inline wire diameters to 204°C (400°F) in 0.8 seconds with the same induction coil. Equipment DW-UHF-10kw induction heater

Test 1 Materials • 0.110″(2.79mm) dia wire Power: 2.22 kW Temperature:  204°C (400°F) Time: 0.9 sec

Test 2 Materials • 0.067″ (1.70mm) dia wire Power: 5.25 kW Temperature:  204°C (400°F) Time: 0.9 sec

Test 3 Materials • 0.06″ (1.52mm) dia wire Power: 5.25 kW Temperature:  204°C (400°F) Time: 0.60 sec

Test 4 Materials • 0.05′ (1.27mm) dia wire Power: 3.77 kW Temperature:  204°C (400°F) Time: 0.70 sec

Process Steps: 1. Clean and apply 204°C (400°F) Tempilaq over the length of the wire. 2. Apply induction heat for 0.8 seconds. Results and Conclusions: All wires exceeded 204°C (400°F) over full length of coil. Further development testing will be required to optimize the equipment for the application for the fastest rates available. Tuning and optimization of the equipment would need to be done with a continuous wire feed in the unit. Based on the results, a 5kW power supply can be used, and further development testing would guarantee the desired rates. A 10kW power supply will recommended. The additional power will make the tuning and development testing easier for the end user and leave additional power for production rates to be easily increased in the future. [wpforms id="3947"]

induction coating removal for removing paint

Induction coating removal principle

The induction disbonder works by the principle of induction. Heat is generated in the steel substrate and the bonding is broken. The coating is then removed entirely without disintegrating and completely free from contaminating agents, i.e. blast media.This obviously makes disposal and recycling of waste easier and cheaper. Even inside the pittings and cracks in the surface the coating is disbonded. The HLQ Induction heating works by fast transfer of energy to the steel substrate, as a result securing a controlled heating of the surface and fast removal of most types of coatings.

What is induction coating removal?

The HLQ Induction coating removal system is a state-of-the-art induction heating tool that rapidly strips paint and tough, high-build coatings. It is a faster, cleaner and safer way to strip coatings.

What are the benefits?

Induction heating can outperform traditional paint-stripping methods. Abrasive blasting or disk grinding are generally more labour intensive and come with other issues such as the cost of enclosure or containment and collection of blast media, plus the filtration or separation of the coating materials for disposal. In many urban projects these are prime considerations and extremely costly to overcome. Whereas, when coatings are removed by induction, the only waste is the coating itself which in most cases can be swept or even vacuumed like any other workshop waste.

Safer working environment: The controlled, localized heat results in significantly reduced fumes and toxic dust.

Easy clean-up: The coating material mainly peels off in flakes rather than being pulverized.

Noiseless operation: Operators can work in public areas without creating a disturbance.

Mobile: The equipment is rugged and reliable but still light-weight and easy to move around worksites.

Reduced energy consumption: Fast, accurate and repeatable heat delivery makes the coating removal process extremely energy efficient.

Method flexibility: Spot heating, scanning, freehand and semi-automatic.

No limitations: The system can be used at flat surfaces, round contours, inside/outside corners, both sides of substrate, round rivets, etc.

Where is it used?

Induction coating removal is used in many industries, such as ships/marine, buildings, storage tanks, pipelines, bridges and offshore.

induction heating involves using alternating current and an induction coil to generate a powerful electro-magnetic field. When used properly, this field generates heat below a coating on a steel substrate, resulting in the coating de-bonding quickly and easily from the metal surface. At Alliance, we use this process to remove coatings from steel such as:

• Multiple coatings including epoxies, urethanes and others
• Lead paint
• Fire-retardant coatings (PFPs)
• Glued and vulcanized rubber as well as chlorinated rubber

Induction Coating Removal On Storage Tanks – The Induction Heating System for coatings removal is highly suitable for fast and efficient stripping of large surfaces or for inspection of weld seams in storage tanks. Experience from work on tank bottoms have shown that thick glass-fiber (5-6 mm) can be removed with stripping rates up to 10-12 m2/hr. while thinner traditional painting systems can be removed in rates up to 35 m2/hr. Not only does the Induction system yield great economic benefits like higher stripping rates and minimal waste disposal, but it is also enables environmentally – and operator friendly operation. Induction Coating Removal On Pipelines – The patented HLQ Induction Heating System for coatings removal has proven to be very effective on pipes and live pipeline projects around the world. It efficiently and safely removes coatings such as Coal Tar, Ebonite, 3LPE/3LPP, rubber and other tough linings with thickness up to 30 mm. Coatings removal with HLQ Technologies is cost effective and does not produce additional grit or water waste, yielding great potential for savings in logistic handling, especially in remote areas.The coatings is removed easily in strips or pieces that is easy to put in waste bags for disposal without risk of contamination to air, ground or water. ​ Working distance from the main unit is up to 100m that allows a flexible and efficient operation. HLQ has developed a patented solution that eliminates the risk of overheating the surface when using the induction system on steel. This has been a prerequisite in the process of successfully receiving approval for use on live oil- and gas pipelines.

induction brazing stainless steel to steel

High frequency magnetic induction brazing stainless steel to steel process

HLQ team was provided with 2 different parts to be brazed in our test laboratory. Objective: Induction Brazing of a 0.15’’/ 3.81mm stainless steel pin to a steel base. Equipment:  DW-UHF-6KW-III handheld induction brazing system  Industry: Appliances & HVAC Materials: Steel hexagon (base 1’’/ 25.4 mm diameter; 0.1’’/ 2.54 mm wall thickness) A stainless steel pin (0.15’’/ 3.81 mm) Other Materials:  All-purpose black brazing flux Power: 1.43 kW Temperature: 1400 °F/ 760°C Time: 8 seconds Process: The two workpieces were carefully positioned together. All-purpose induction brazing black flux was added because it is ideal for high-temperature applications where rapid, localized heating is needed. The process of induction brazing was performed successfully within 8 seconds by using the  DW-UHF-6KW-III handheld induction brazing system, producing the induction heating power of 1.43 kW at 1400 °F/ 760°C.

Brazing Copper Bars with Induction

Brazing Copper Bars with Induction Objective: To braze bus bar assemblies together Material: • 2 copper bus bars 6" (152.4mm) wide, 2' (609.6mm)long, 2 copper bars 6"(152.4mm) wide, 18" (457.2)long & 3/8" (9.65mm) thick • braze shim preforms and white flux Temperature: 1292 ºF (700 ºC) Frequency: 80 kHz Equipment • DW-UHF-60KW induction heating system, equipped with a remote workhead containing eight 1.0 μF capacitors for a total of 2.0 μF. • An induction heating coil, designed and developed specifically for this application Process: A three-turn helical coil is used to heat the assembly. Three braze shim preforms are placed between the plates and white flux is applied to the assembly. It is heated for 5 minutes to evenly flow the braze alloy. A high current capable, aesthetic looking braze zone is produced. Results/Benefits Induction heating provides: • Consistently produced, quality parts • Heat into the part that is divided equally between the copper pieces, allowing for even flow and consistent use of braze • Hands-free operation that doesn't require skilled operators

Brazing Carbide Tool Tips With Induction

Brazing Carbide Tool Tips With Induction  Objective: Attaching carbide cutters to a steel meat cutter impeller Material carbide blocks; steel shank fitting Temperature 1400 °F (760 °C) Frequency 300 kHz Equipment DW-UHF-30KW induction heating systems including: Induction heating coil Workhead: two-cap 1.0μF (Total 0.5 μF) Process The entire part is placed in a five-turn helical coil, the power is applied until the part is heated to the required temperature and a uniform heat pattern is achieved. The coil allows for easy fixturing and uniformity of heating between the carbide and the steel shank for a premium braze joint. Results/Benefits Precision: Due to the size of the induction coil, the process allows for precise placement of the carbides on the steel shanks Economy: Power is consumed only during the heat cycle Repeatability: joint quality is maintained in this repeatable process

Soldering Steel To Brass With Induction Heater

Soldering Steel To Brass With Induction IGBT Soldering Heater Objective Heat an assembly of small, gold-plated steel connectors to a brass block. Material Approx. 1/8” (3.2mm) diameter gold-plated steel connectors, 1”(25.4mm) square x 1/4” thick brass block Temperature 600°F(315.6ºC) Frequency 240 kHz Equipment • DW-UHF-6kW induction heating system equipped with a remote workhead. • An induction heating coil designed and developed specifically for this application. Process A two-turn helical coil is used to provide uniform heat to parts assembly. Solder paste and flux are applied to the joint area and power is applied for 20 seconds to solder the parts. Proper fixturing is needed to hold the parts in position. Results/Benefits Induction heating provides: • Rapid, localized heating to specific regions of part • Neat and clean joints • Flameless processing

induction Brazing copper rods to brass strips

Objective Induction Brazing copper rods to brass strips to replace torch operation. The current torch process results in excessive contaminants on the assembly, and requires extensive rework after the induction brazing operation.

Equipment DW-UHF-10KW INDUCTION BRAZING MACHINE Two turn open end conveyor coil Materials • Copper coupon plate and copper rod • Braze wire – EZ Flo 45 • Braze alloy – 45% Silver, 1/32 DIA

Key Parameters – TEST 1 Power: 7.2 kW Temperature: Approximately 1350° F (732° C) Time: Average time – 100 seconds Process and Results: For Induction brazing copper plate to copper rod,, EZ Flo 45 braze wire was cut into 2” lengths and placed in the interface area. In a production situation, EZ Flo 45 brazing paste is recommended. The assemblies were set up and heated for an average time of 100 seconds to flow the alloy and achieve the braze.

Key Parameters – TEST 1 Power: 6 kW Temperature: Approximately 1350° F (732° C) Time: Average time – 2.5 minutes Process and Results: For Induction brazing copper rod to brass plate,, EZ Flo 45 braze wire was cut into 2” lengths and placed in the interface area. In a production situation, EZ Flo 45 brazing paste is recommended. The assemblies were set up (see photographs) and heated for an average time of 2.5 minutes to flow the alloy and achieve the braze. Due to the metal resistance differential between copper and brass, the brass bar heat preferentially. The induction heating coil designed to braze the bars to the plate section heats the rods and the heat is transferred to the plate more by conduction than induction causing the bars to initially reach temperature prior to the plate. If the materials are the same (cooper to copper or brass to brass, this is not a problem. If the bar is copper and the plate is brass there are not issues – only when the bar is brass and the plate is copper. This requires the power to be reduced to allow tie for heat transfer from the brass rod to the copper plate.

Key Parameters – TEST 1 Power: 7.2 kW Temperature: Approximately 1350° F (732° C) Time: Average time – 2 minutes Process and Results: For Induction braze copper coupon plate and copper rod,, EZ Flo 45 braze wire was cut into 2” lengths and placed in the interface area. In a production situation, EZ Flo 45 brazing paste is recommended. The assemblies were set up  and heated for an average time of 2 minutes to flow the alloy and achieve the braze.

Results/Benefits:

• induction brazing Strong durable joints
• Selective and precise heat zone, resulting in less part distortion and joint stress than welding
• Less oxidation
• Faster heating cycles
• More consistent results and suitability for large volume production, without the need for batch processing
• Safer than flame brazing

RF Soldering Circuit Board

Induction RF Soldering Circuit Board With High Frequency Soldering Heater Objective Heat a circuit board assembly to 600ºF (315.5ºC) to solder RF connectors to a radar manifold. Material Kovar connectors 0.100” (2.54mm) wide x 0.200” (5.08mm) long, circuit board and solder paste Temperature 600ºF (315.5ºC) Frequency 271 kHz Equipment • DW-UHF-2 kW induction heating system, equipped with a remote workhead containing one 1.2μF capacitor. • An induction heating coil designed and developed specifically for this application. Process A two turn helical coil is used to heat the assembly. Solder paste is applied to the joint area, the connectors are placed in the proper location and heat is applied for 10 seconds, creating the solder paste to flow. Results/Benefits Induction heating provides: • Creates liquid and gas-tight joint quickly and efficiently • Precise application of heat without affecting others areas of board • Hands-free heating that involves no operator skill for manufacturing • Even distribution of heating            

Induction Heating Steel Mold

Induction Heating Steel Mold For Rubber Seal With High Frequency Heating System Objective To heat a steel mold evenly to 392ºF (200ºC) to be used on a press for rubber seal vulcanization Material Steel mold 13.4” (340mm) diameter, 2.16” (55mm) width, approximately 77.2 lbs (35kg) Temperature 392ºF (200ºC) Frequency 20kHz Equipment • DW-MF-70kW induction heating system, equipped with a remote workhead containing eight 0.3μF capacitors for a total of 0.6μF • An induction heating coil designed and developed specifically for this application. Process Two thirteen turn pancake coils are used to heat both sides of the mold simultaneously for 170 seconds to reach an external temperature of 392ºF (200ºC). The power is continually decreased over the next 390 seconds to reach a uniform temperature of 392ºF (200ºC) ± 41ºF (5ºC) throughout the mold. Results/Benefits Induction heating provides: • Repeatable and consistent heat • Quicker process time, increased production • Even distribution of heating                              

Induction inline wire heating process

Objective Induction Heat several different inline wire diameters to 204°C (400°F) in 0.8 seconds with the same induction coil. Equipment DW-UHF-10kw induction heater

Test 1 Materials • 0.110″(2.79mm) dia wire Power: 2.22 kW Temperature:  204°C (400°F) Time: 0.9 sec

Test 2 Materials • 0.067″ (1.70mm) dia wire Power: 5.25 kW Temperature:  204°C (400°F) Time: 0.9 sec

Test 3 Materials • 0.06″ (1.52mm) dia wire Power: 5.25 kW Temperature:  204°C (400°F) Time: 0.60 sec

Test 4 Materials • 0.05′ (1.27mm) dia wire Power: 3.77 kW Temperature:  204°C (400°F) Time: 0.70 sec

Process Steps: 1. Clean and apply 204°C (400°F) Tempilaq over the length of the wire. 2. Apply induction heat for 0.8 seconds. Results and Conclusions: All wires exceeded 204°C (400°F) over full length of coil. Further development testing will be required to optimize the equipment for the application for the fastest rates available. Tuning and optimization of the equipment would need to be done with a continuous wire feed in the unit. Based on the results, a 5kW power supply can be used, and further development testing would guarantee the desired rates. A 10kW power supply will recommended. The additional power will make the tuning and development testing easier for the end user and leave additional power for production rates to be easily increased in the future. [wpforms id="3947"]

Induction Soldering Circuit Board

Induction Soldering Circuit Board With IGBT heating system Objective To heat post, lead or lead-free solder preforms for various circuit board soldering applications. Material Upper and lower circuit boards, small and large lead or lead free preforms. Temperature < 700 ºF (371ºC) depending on the preform used Frequency Three turn coil 364 kHz Small two turn coil 400 kHz Large two turn coil 350 kHz Equipment • DW-UHF-4.5 kW induction heating system, equipped with a remote workhead containing two 0.66μF capacitors for a total of 1.32 μF • An induction heating coil, designed and developed specifically for this application. Process Three individual coils are used to heat the various locations on the circuit board depending upon if the location is a single application or a group application. The time varies from 1.8 to 7.5 seconds depending upon location. In production the heat stations and coils are moved into position over the post for automation purposes. Either lead or lead free solder preforms are used. The process time on the lead free solder is slightly longer. Results/Benefits Induction heating provides: • Hands-free heating that involves no operator skill for manufacturing, lends itself well to automation. • Solder controlled by preforms, no excess left on board. • Good solder flow without over heating the board and damaging adjacent circuits and components.  

Induction Brazing Heating Exchanger Copper Pipes

Objective Induction Brazing Heating Exchanger copper pipes to coppers Industry Various industries Base material Copper tubes Cu-DHP acc. to EN12735 or EN1057 – Diameter / thickness of external tube: 12.5 x 0.35 and 16.75 x 0.4 – Type of assembly: lap joint Other materials Brazing alloy rings

Equipment DW-UHF-20KW induction brazing machine HLQ Custom Coil Key Parameters Power: 12kW Time: ≈ 5s

Process A manufacturer of heating exchangers for various industries wanted to increase operator safety and production rate during the process of induction brazing. We received a sample of a heat exchanger which was a part of an actual assembly (more than 10 m long). The goal was to determine the most suitable design for a custom coil which will allow for the induction brazing of two joints to be performed simultaneously. HLQ team recommended using the DWS which is a mobile induction heating solution that can be utilized as a hand-held unit or can be integrated with a robotic arm for automated production lines. Тhe performed tests matched the exact position of the heat exchanger on the production to simulate actual working conditions. We used a custom-designed elliptical coil with a positioning fixture to help the operator achieve repeatable results, as well as increase the production rate by brazing 2 joints for 5 sec. As a result, the brazed connection becomes extremely secure and leak-proof. Compared to gas torch brazing, induction heating does not produce an open flame, thus it is much safer for the operator. Fast process and repeatability are guaranteed. Heat exchangers are devices that are widely used in many industries – space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural gas processing, and sewage treatment. Benefits

• Safe heating with no open flame
• Precise control over time and temperature resulting in improved quality and consistent result
• A repeatable process, not operator dependent
• Energy efficient induction heating

Technology of Induction Forming Steel Plate

Technology of Induction Forming Steel Plate Triangle heating technique using a gas flame is used to deform steel plate in ship construction. However, in the flame heating process, the heat source is often difficult to control and parts cannot be deformed efficiently. In this study, a numerical model is developed to study the triangle heating technique with the more controllable heat source of high frequency induction heating and to analyze the deformation of steel plate in the heating process. To simplify the many complex trajectories of the triangle heating technique, a rotational path of inductor is suggested and then a 2-dimensional circular heat input model is proposed. The heat flow and transverse shrinkage in steel plate during triangle heating with the induction heat are analyzed. The results of the analyses are compared with those of experiments to show the good agreement. The heat source and thermo-mechanical analysis models proposed in this study were effective and efficient for simulating the triangle heating technique in the forming of steel plate in shipbuilding. Technology of Induction Forming Steel Plate

induction heating diffusion pump with electromagnetic heater

induction heating diffusion pump with electromagnetic heater

Induction Heating diffusion pump-Vacuum coating diffusion pump electromagnetic induction heater instead of resistance heating plate can save how much electricity?

The traditional diffusion pump is slow to warm up, and also has broken wires, easy to short circuit, low reliability, and easy failure. It brings a lot of inconvenience to the actual operation. For this reason, HLQ has specially developed a special electromagnetic induction heater for diffusion pump, which consumes 7-8 kWh of electricity per hour after transformation. The time is shortened by more than half, and the operation is convenient, the installation is easy, and the style is novel, which may bring good news to the vacuum coating industry.

Electromagnetic induction heating is a way of heating the body itself by converting electrical energy into magnetic energy. Electromagnetic induction heating cable disk directly ACTS on the bottom of the pump through induction to generate a magnetic field, so that the pump generates heat itself. The electromagnetic furnace plate does not generate heat, the thermal conversion efficiency reaches more than 98%, the temperature control is accurate, PID can automatically adjust the power.

Advantages of diffusion pump electromagnetic induction heating over resistance wire heating:

(1) high efficiency and energy saving, saving more than 30% electricity than resistance wire heating. (2) fast heating speed and even heating. (3) stable operation and accurate temperature control (4) easy operation and long service life At room temperature, it takes 70-90 minutes for a traditional 15kw resistance wire for a diffusion pump with a diameter of 830mm to rise to 230 degrees and can no longer be heated up, while the 15kw electromagnetic heating coil only takes 35-40 minutes to raise the temperature to 230 degrees , greatly shorten the preheating time, improve the production efficiency, and save a lot of power. When the equipment is shut down, when the resistance wire heating method is used, because the electric furnace has residual heat, the cooling pump will work for a long time before it can stop, and the coil used for electromagnetic heating has no heat. After the equipment is shut down, it can be quickly Stop the cooling pump. This also saves the power consumption of the cooling pump. It can be seen that electromagnetic heating saves at least 30%-60% energy than traditional resistance wire heating. Electromagnetic induction heating evaporation coating can greatly improve the evaporation rate, and the evaporation temperature is stable, which can avoid the splash phenomenon of the coating material, the film will not have the effect of pinholes, greatly improve the qualification rate of the product, and the purity requirements of the coating material are also higher than the resistance. The requirements of the furnace are lower. The high-purity material required by the resistance furnace (electric furnace wire) must reach 99.99% purity, while the electromagnetic heating evaporation only needs to reach 99.9%. From every point, it can be seen that the electromagnetic heating evaporation technology has reduced Coating production cost. Diffusion pump induction heating has automatic constant temperature, automatic shifting and adjustable functions, energy saving, environmental protection, durability and longevity Up to 50,000 hours or more, no open flame, can reduce the indoor temperature and prolong the life of the cooling water pipe. Easy installation and disassembly, as well as maintenance of the diffusion pump. After installation, it does not affect the vacuum, does not affect the product, and does not affect the time to make a furnace product. product is guaranteed for 12 months free of charge, and technical support is provided for life. The product is not easy to break, and can be easily replaced with a resistance furnace. Once there is a problem with the product, the manufacturer will send a spare machine to replace it in time.

Induction heating machine is widely used in heat transfer forging, quenching, tempering, annealing, quenching and other heat treatment industries, as well as preheating, hot charging and other industries.

So what are the advantages of electromagnetic induction heating system that make it widely used in all walks of life? Nowadays, many users are using this induction heater. Users use it because it has its own advantages. Induction heating machine adopts electromagnetic induction heating process to directly heat the workpiece. It has the advantages of fast on-off speed and high working frequency.

1. Energy saving and environmental protection. Now the state's control of air pollution is becoming more and more strict. This is the advantage of induction heating machine
2. The use of induction heating machine can reduce the production cost.
3. Induction heating machine has high technical content, so its energy efficiency is also very good.
4. Induction heating machine can be used with very good performance and high efficiency.

Induction Shrink Fitting Steel Tube

Induction Shrink Fitting Steel Tube With IGBT Heating Units Objective Heating a steel tube to 500-1000°F for a shrink-fitting application. Determine expansion (growth) of ID at varying temperatures. Material Steel tubes 7” OD x 4.75” ID x 5” heat zone Type ‘K’ thermocouple to measure temperature Thermal blanket Temperature 500, 800, 1000 °F (260, 427, 538° C) Frequency 66 kHz Equipment DW-HF-7.5, 7.5 kW, 150-400 kHz induction power supply, equipped with a remote heat station containing two 1.5 μF capacitors (for a total of 0.75 μF) A multi-turn, special series-parallel induction heating coil designed and developed specifically for this application. Process Initial tests were completed on a sample without a thermal blanket. A thermocouple is slipped between the copper ring and the steel tube to measure temperature. The part measured 4.940” (at room temperature with an ID gauge.) The part reaches 1000°F (538°C) in about 10 minutes. The chart below shows the comparison between theoretical and experimental measured results Results/Benefits The part measures 4.975” at 1000°F yielding an expansion of 0.035” (4.975 minus 4.94). At 500 and 800°F the expansion numbers were 4.950 and 4.964 respectively. When using a thermal blanket the heat time is reduced by about 90 seconds (8.5 minutes as opposed to 10 minutes).