Induction Hot Plate

High Frequency Induction Hot Plate with a Tin Coating for Flow-Melting  Objective Heat a carbon steel plate coated with tin to 450 ºF (232 ºC) for flow-melting Material 7.9” (200mm) x 4.7” (120mm) steel plates with a tin layer of 100 to 1000nm thickness, temperature sensing paint, water for quenching Temperature 450 ºF (232 ºC) Frequency 350 kHz Equipment • DW-UHF-20kW induction heating system, equipped with a remote workhead containing two 0.5μF capacitors for a total of 0.25μF • An induction heating coil designed and developed specifically for this application. Process A nine turn “Dog Bone” style coil is used for the flow-melting process. The tin coated carbon steel plate is placed in the coil for 1.34 seconds to uniformly reflow the tin coating. The plate is then quenched in cool water to retain sufficient free tin at the surface. Results/Benefits Induction heating provides: • Uniform heating • Rapid focused heat              

Induction Shrink Fitting For Inserts

Induction Shrink Fitting For Inserts with IGBT Shrink fitting Heater Objective: To heat an aluminum fuel pump housing measuring 8" x 4 1/2" x 3 1/2" to 3750F, allowing steel parts to be inserted. Presently the housings are heated for over one hour in a convection oven. The areas that are to have steel parts inserted measure 1.5" and 0.6875" in diameter. In addition, the insertion process lasts for a little over one minute, so 3750F should be maintained for a period of time to complete the process. Material: Aluminum Pump Housing measuring 8" x 4 1/2" x 3 1/2" Steel insertion parts. Temperature: 3750F Application: By using the DW-HF- 25, 25 kW output solid state induction power supply the following results were achieved. - 3750F was reached in one (1) minute to allow for insertion. - 20 housings were successfully heated using a five (5) turn right angle pancake coil. Equipment: Ameritherm SP 25, 25 kW output solid state induction power supply including one (1) remote heat station containing four (4) capacitors totalling 1.0 μF, and  a five (5) turn right angle pancake coil made from 3/16" copper tube. Frequency: 80 kHz  

Induction Soldering Stainless Steel Tubes to Brass Base

Objective Induction Soldering stainless steel tubes to brass base Equipment DW-UHF-6KW-III handheld induction heater

Materials Customer material including flux Key Parameters Power: 2 kW Temperature: 482°F (250°C not measured) Time: 14 -16 sec

Process Steps Customer process instruction has been followed DW-UHF-6KW-III induction heating system was limited to 2kW Results and Conclusions Sample position according to the coil is vital.Induction Soldering Stainless steel is heated much fasted than the brass. So, the coil is positioned over the brass part (around 95%)

induction brazing and soldering technology

HLQ Induction heating systems are value added systems that can fit directly into the manufacturing cell, reducing scrap, waste, and without the need for torches. The systems can be configured for manual control, semi-automated, and all the way up to fully automated systems. HLQ induction brazing and soldering systems repeatedly provide clean, leak-free joints for a wide range of parts including fuel lines, heat exchangers, gas distributors, manifolds, carbide tooling, and more. Principles of Induction Brazing & Soldering Brazing and soldering are processes of joining similar or dissimilar materials using a compatible a filler material. Filler metals include lead, tin, copper, silver, nickel and their alloys. Only the alloy melts and solidifies during these processes to join the work piece base materials. The filler metal is pulled into the joint by capillary action. Soldering processes are conducted below 840°F (450°C) while brazing applications are conducted at temperatures above 840°F (450°C) up to 2100°F (1150°C). The success of these processes depends upon the assembly’s design, clearance between the surfaces to be joined, cleanliness, process control and the correct selection of equipment needed to perform a repeatable process. Cleanliness is ordinarily obtained by introducing a flux which covers and dissolves dirt or oxides displacing them from the braze joint. Induction Brazing Filler Materials Induction Brazing filler metals can come in a variety of forms, shapes, sizes and alloys depending on their intended use. Ribbon, preformed rings, paste, wire and preformed washers are just a few of the shapes and forms alloys that can be found. The decision to use a particular alloy and/or shape is largely dependent on the parent materials to be joined, placement during processing and the service environment for which the final product is intended. Many operations are now conducted in a controlled atmosphere with a blanket of inert gas or combination of inert / active gasses to shield the operation and eliminate the need for a flux. These methods have been proven on a wide variety of material and part configurations replacing or complimenting atmosphere furnace technology with a just in time - single piece flow process. Clearance Affects Strength Clearance between the faying surfaces to be joined determines the amount of braze alloy, capillary action / penetration of the alloy and subsequently the strength of the finished joint. The best fit up condition for conventional silver brazing applications are 0.002 inches (0.050 mm) to 0.005 inches (0.127 mm) total clearance. Aluminum is typically 0.004 inches (0.102 mm) to 0.006 inches (0.153 mm). Larger clearances up to 0.015 inches (0.380 mm) usually lack sufficient capillary action for a successful braze. Brazing with copper (above 1650°F / 900°C) requires the joint tolerance kept to an absolute minimum and in some cases press fit at ambient temperatures to assure minimum joint tolerances while at the brazing temperature. Induction heating has proven to be a valuable aid in the joining process for many reasons. Rapid heading and precise heat control offers the possibility of localized heating of high strength components without significantly changing the material properties. It also allows for the brazing of difficult materials such as aluminum and sequential, multi-alloy brazing and soldering of close proximity joints. Induction heating in brazing and soldering applications is readily adaptable to production line methods, permitting strategic arrangement of the equipment in an assembly line, and if necessary, heating by remote control. Frequently, induction brazing and soldering permits a reduction in the require number of part fixtures, with the minimal heating of the fixtures increasing life span and maintaining accuracy in alignment of the components to be joined. Since operators need not guide the induction heating source, both hands are left free to prepare assemblies for joining. HLQ induction brazing equipment delivers quality, consistency, configurable throughput, and quick change-over tooling for various production needs. The Radyne induction brazing and soldering product line offers standard solutions for brazing: Aluminum Copper Brass Stainless steel Carbide And more…

induction brazing stainless steel tubing process

Induction Brazing stainless steel tubing and stainless steel fittings Technology

Objective Induction Brazing stainless steel tubing and stainless steel fittings Equipment DW-UHF-20kw induction brazing machine

Materials 1.75″ (44.45mm) Hexagon fitting Power: 10.52 kW Temperature: 1300°F (704°C) Time: 30 seconds

Results and Conclusions:

• Induction heating pinpoints the heat to the desired area of the part
• Improved process control for precise heating to a desired temperature
• Power on demand and rapid, consistent heat cycles
• Technology without pollution, which is both clean and safe

Induction Brazing Machine

Induction Brazing Machine&Soldering Equipment

Main characteristics:

    1.  IGBT module and inverting technologies of the first generation been used.

    2.  Simple structure and light weight and easy for maintenance.

    3.  Simple to operat ,afew minutes is enough to learn it.

    4.  Simple to install,installation can be done by unprofessional person very easily.

    5.  advantages of the model with timer,the power and the operatingtime of the heating period and the rain period  can be preset repectively,to realize a simple heating curve,this model is suggested to use for batch production to improve the repeatability.

   6.   The separated models are designed to fit the dirty surrounding of some cases.

Specifications：

Series	Model		Input power Max	Input current Max	Oscillate frequency	Input Voltage	Duty cycle
M . F .	DW-MF-15 Induction Generator		15KW	23A	1K-20KHZ According to the application	3*380V 380V±20%	100%
	DW-MF-25 Induction Generator		25KW	36A
	DW-MF-35Induction Generator		35KW	51A
	DW-MF-45 Induction Generator		45KW	68A
	DW-MF-70 Induction Generator		70KW	105A
	DW-MF-90 Induction Generator		90KW	135A
	DW-MF-110 Induction Generator		110KW	170A
	DW-MF-160 Induction Generator		160KW	240A
	DW-MF-45 Induction Heating Rod Forging Furnace		45KW	68A	1K-20KHZ	3*380V 380V±20%	100%
	DW-MF-70 Induction Heating Rod Forging Furnace		70KW	105A
	DW-MF-90 Induction Heating Rod Forging Furnace		90KW	135A
	DW-MF-110 Induction Heating Rod Forging Furnace		110KW	170A
	DW-MF-160 Induction Heating Rod Forging Furnace		160KW	240A
	DW-MF-15   Induction Melting Furnace		15KW	23A	1K-20KHZ	3*380V 380V±20%	100%
	DW-MF-25   Induction Melting Furnace		25KW	36A
	DW-MF-35   Induction Melting Furnace		35KW	51A
	DW-MF-45   Induction Melting Furnace		45KW	68A
	DW-MF-70   Induction Melting Furnace		70KW	105A
	DW-MF-90   Induction Melting Furnace		90KW	135A
	DW-MF-110 Induction Melting Furnace		110KW	170A
	DW-MF-160 Induction Melting Furnace		160KW	240A
	DW-MF-110 Induction Hardening Equipment		110KW	170A	1K-8KHZ	3*380V 380V±20%	100%
	DW-MF-160Induction Hardening Equipment		160KW	240A
H . F .	DW-HF-04 Series	DW-HF-4KW-A	4KVA	15A	100-250KHZ	Single phase 220V	80%
	DW-HF-15 Series	DW-HF-15KW-A DW-HF-15KW-B	15KVA	32A	30-100KHZ	Single phase 220V	80%
	DW-HF-25 Series	DW-HF-25KW-A DW-HF-25KW-B	25KVA	23A	20-80KHZ	3*380V 380V±10%	100%
	DW-HF-35 Series	DW-HF-35KW-B	35KVA	51A
	DW-HF-45 Series	DW-HF-45KW-B	45KVA	68A
	DW-HF-60 Series	DW-HF-60KW-B	60KVA	105A
	DW-HF-80 Series	DW-HF-80KW-B	80KVA	130A
	DW-HF-90 Series	DW-HF-90KW-B	90KVA	160A
	DW-HF-120 Series	DW-HF-120KW-B	120KVA	200A
U . H . F .	DW-UHF-3.2KW		3.2KW	13A	1.1-2.0MHZ	Single phase220V ±10%	100%
	DW-UHF-4.5KW		4.5KW	20A
	DW-UHF-045T		4.5KW	20A
	DW-UHF-045L		4.5KW	20A
	DW-UHF-6.0KW		6.0KW	28A
	DW-UHF-06A		6.0KW	28A
	DW-UHF-6KW-B		6.0KW	28A
	DW-UHF-10KW		10KW	15A	100-500KHZ	3*380V 380V±10%	100%
	DW-UHF-20KW		20KW	30A	50-250KHZ
	DW-UHF-30KW		30KW	45A	50-200KHZ
	DW-UHF-40KW		40KW	60A	50-200KHZ
	DW-UHF-60KW		60KW	90A	50-150KHZ

 

Induction Brazing Basics

Induction Brazing Basics for jointing copper,silver,brazing,steel and stainless steel,etc. Induction Brazing uses heat and filler metal to join metals. Once melted, the filler flows between close-fitting base metals (the pieces being joined) by capillary action. The molten filler interacts with a thin layer of the base metal to form a strong, leak-proof joint. Different heat sources can be used for brazing: induction and resistance heaters, ovens, furnaces, torches, etc. There are three common brazing methods: capillary, notch and moulding. Induction brazing is concerned solely with the first of these. Having the correct gap between the base metals is crucial. A too-large gap can minimize the capillary force and lead to weak joints and porosity. Thermal expansion means gaps have to be calculated for metals at brazing, not room, temperatures. Optimum spacing is typically 0.05 mm – 0.1 mm. Before you braze Brazing is hassle-free. But some questions should be investigated — and answered — in order to assure successful, cost-effective joining. For instance: How suitable are the base metals for brazing; what’s the best coil design for specific time and quality demands; should the brazing be manual or automatic? At DAWEI Induction we answer these and other key points before suggesting a brazing solution. Focus on flux Base metals must usually be coated with a solvent known as flux before they are brazed. Flux cleans the base metals, prevents new oxidation, and wets the brazing area prior to brazing. It is crucial to apply sufficient flux; too little and the flux may become saturated with oxides and lose its ability to protect the base metals. Flux is not always needed. Phosphorous-bearing filler can be used to braze copper alloys, brass and bronze. Flux-free brazing is also possible with active atmospheres and vacuums, but the brazing must then be performed in a controlled atmosphere chamber. Flux must normally be removed from the part once the metal filler has solidified. Different removal methods are used, the most common being water quenching, pickling and wire brushing.  

Induction Brazing Copper Assembly

Induction Brazing Copper Assembly With High Frequency Heating Equipment Objective Brazing a copper pivot assembly Material Two copper uprights 2” (5cm) wide x 4” (10.2cm) high, copper base 3” (7.6cm) x 2” (5cm) and .5” (1.3mm) thick with 2 channels for the uprights to the slide into, braze shims and black flux Temperature 1350 ºF (732 ºC) Frequency 200 kHz Equipment •DW-UHF-20kW induction heating system, equipped with a remote workhead containing two 1.0μF capacitors for a total of 0.5μF • An induction heating coil designed and developed specifically for this application. Process A three turn helical coil is used to heat the base of the assembly. The copper uprights and two braze shims are placed in the grooves in the base and black flux is applied. The assembly is placed in the coil and power is applied for 4 minutes to braze both the uprights in place. Results/Benefits Induction heating provides: • Rapid localized heat which can minimize oxidation and reduce cleaning after joining • Consistent and repeatable joints • Hands-free heating that involves no operator skill for manufacturing • Even distribution of heating

induction heating steel casting

induction heating steel casting of rubber mold with high frequency induction heater Objective To preheat two irregularly shaped steel castings to be molded and bonded with synthetic rubber Material Two steel castings, 17 lb. irregularly shaped, approximately 6” (152mm) x 9” (229mm) x 1” (25.4mm) Temperature 400 ºF (204 ºC) Frequency 20 kHz Equipment • DW-MF-45kW induction heating system, equipped with a remote workhead containing four 1.0 μF capacitors (for a total of 1.0 μF). • An induction heating coil designed and developed specifically for this application. Process Two steel castings are placed onto an insulated plate with brass guide location pins. The plate is placed onto a table which slides into a large multi-turn helical coil. The parts are induction heated to 400 ºF in 180 seconds. The slow heating time allows the parts to come up to temperature evenly. When the heating cycle is completed each part is placed into a press for the molding and bonding operation. Results/Benefits Induction heating for bulk preheating of steel castings produces: • efficient and repeatable heat vs. a torch or an oven. • even heating of parts throughout Large multi-turn coils provide: • easy loading and unloading of the parts • flexibility for varying bulk castings sizes and geometries

Induction Soldering Wire of Co-axial

Induction Soldering Wire of Co-axial With High Frequency Heating Units Objective To solder center-conductor and shielding braid of wire assemblies to 500 (250) °F(°C). Material • Customer-supplied assemblies • Temperature indicating paint • Flux-cored solder wire Temperature 500 (250) °F (°C) Frequency 272 kHz Equipment DW-UHF-4.5kW induction heating system, equipped with a remote heat station containing two 0.33 μF capacitors. An induction heating coil designed and developed specifically for this application. Process A multi-turn helical coil is used and temperature-indicating paint is applied to the joint area. The wire assembly is placed over the induction heating coil, and RF power is applied. The time-to-temperature and the heating pattern on the part are established. The next wire assembly is placed on the coil, the assembly is heated and solder wire is fed into the joint. The assembly heats well and reaches 500 °F in 10 seconds. Results/Benefits • elimination of a crimp process • more reliable connections are made • faster process times                

Induction Bar End Heating Furnace

HLQ Induction Equipment Co is the World leader in the design and manufacture of induction heating products including those for induction bar end heating applications. Higher production rates can be achieved with the use of multiple solenoid coils while channel induction coils facilitate material handling of long bars through the use of chain conveyors to continuously feed the bars through the C-shaped coil. Parameter of induction bar end heating furnace:

		DW-MF-200	DW-MF-250	DW-MF-300	DW-MF-400	DW-MF-500	DW-MF-600
Input Voltage		3phases, 380V/410V/440V , 50/60Hz
Max Input Current		320A	400A	480A	640A	800A	960A
Oscillating frequency		0.5KHz^20KHz ( Oscillating frequency will be customized according to the size of heating parts)
Duty Cycle Loading		100%,24h continuously work
Cooling Water Desires		0.1MPa
Dimension	Host	1000X800X1500mm			1500X800X2800mm	850X1700X1900mm
	Extension	extension will be customized according to the material and size of heating parts
Weight		110kg	150kg	160kg	170kg	200kg	220kg
		Depend on the dimension of extension

Induction Annealing Brass Bullet Shells

Induction Annealing Brass Bullet Shells Heating Treatment UHF Series With Induction Heating System

  Application Note Objective:  A manufacturer of brass bullet shells wants to upgrade their existing induction heating equipment and is looking for improved efficiency. The goal of this application test is to demonstrate that the DW-UHF-6KW-III induction system will meet and exceed its requirements for achieving improved heating times and maintaining heat uniformity within the targeted area.  Two sizes of brass ammunition shells were used for the test – bullet casings with 1.682” (42.7 mm) length and 0.929” (23.5 mm) length. The targeted annealing time is 0.6 seconds for both parts using a single induction heating coil.   Equipment:   HLQ  DW-UHF-6kW-III air-cooled induction heating system was utilized in the annealing process. Tempilaq paint was used to determine if the desired temperature in the annealed area is reached. 

Process:   The brass bullet shells were positioned in the induction heating coil. The area to be annealed took about 60% of the part’s length counting from the open end. The heated area was painted with Tempilaq which helped us evaluate the temperature distribution. Both parts successfully reached the target temperature of 750°F (398°C) in 0.6sec. For the smaller part, the power supply power was reduced to 45% to prevent the part’s overheating.    

Induction Annealing

In general, the main purpose of induction annealing heat treatment is to soften the steel, regenerate overheated steel structures or just remove internal tensions. It basically consists of heating to austenitizing temperature (800ºC and 950ºC depending on the type of steel), followed by slow cooling. Induction Annealing is a heat treatment process which involves heating of material above its recrystallization temperature. The aim is to reach and maintain a suitable temperature for enough time followed by proper cooling. It is often used in metallurgy and material science to make the treated sample more workable by reducing its hardness and increasing its ductility (ability to undergo a change of form without breaking). Annealing alters the physical and sometimes the chemical properties of the material as recrystallization is obtained during the process of cooling. Therefore, the outcoming structures of many alloys, including carbon steel, are both dependent on the heating and on the cooling rate. Ferrous metals, such as steel, require slow cooling to anneal. Other materials (e.g. copper, silver) can be either cooled slowly in air or quickly quenched in water. Induction heating provides improved control of the annealing process. Repeatable heating profiles can easily be obtained by precise regulation of the heating power. Since the workpiece is directly heated by the magnetic field, a faster response can be achieved. Moreover, the high overall efficiency of the induction heating process is crucial for such lengthy treatment. Compared to most of the standard methods, induction annealing is a clean and easy to automate, contactless approach providing a high quality of the treated workpieces.

Induction annealing heating advantages:

• Processed in line with control of parameters in real time
• Metallurgical results similar to those obtained in conventional ovens
• Less environmental pollution
• Increase energy efficiency
• Reduced processing time
• Ability to control the heat, temperature accuracy
• Ability to heat small areas without changing the characteristics of the rest of the part
• Cycle accurate and repetitive heat
• Reduction of surface oxidation
• Improved job environment

Some related industries are tube and pipe, medicine, oil and gas and automotive.

Induction Brazing Carbide Onto Steel Part

Induction Brazing Carbide Onto Steel Part

Objective Brazing carbide onto steel workpiece Equipment DW-UHF-6KW-III Handheld Induction Brazing Heater Key Parameters Power: 4kW Temperature: Approximately 1500°F (815°C) Time: 16 sec Materials Coil-  2 helical turns (20 mm ID) 1 planar turn (40 mm OD, 13 mm Height) Carbide-  13 mm OD, 3 mm wall thickness Steel piece– 20 mm OD, 13 mm ID

Process:

1. To demonstrate elimination of “hand feeding” the alloy, we formed the alloy into a ring to tightly fit over the center post tube. This method provides a uniform amount for each cycle, resulting in uniform joints and wetting.
2. The custom made coil was then placed over the steel piece, where is was set for 14 seconds to heat the alloy.
3. The alloy was heated at approximately 1500°F (815)°C
4.  The whole piece is left alone and cooled with ambient air

Results/Benefits:

• Brazing was successful all in under 20 seconds with 3kW
• High quality and repeatability of the brazed joints
• Increased productivity
• Rings will need to be developed for specific joints to prevent the use of too much alloy
• Precise control of the time and temperature

induction small copper tubing brazing connection joints

Objective Full solid high frequency induction small copper tubing brazing connection joints using the DW-UHF-10 kW induction brazing system and available split lab coil

Test 1 Equipment DW-UHF-10kw induction brazing machine Materials • Copper tubing – Suction Tube • Braze paste Key Parameters Power: 9.58 kW Temperature: Approximately 1500° F (815° C) Time: 5 – 5.2 sec

Test 2 Equipment  DW-UHF-10kw induction brazing system Materials • Copper tubing – Condenser tube • Braze paste Key Parameters Power: 8.83 kW Temperature: Approximately 1300° F (704° C) Time: 2 sec

Process: Test 1 As only one assembly was provided for the test, we set up a test load using a heavy wall 5/16” copper tubing set up such as one tube accepted the other at a formed open flange end. Heat time was estimated based on using tempilaque paint to indicate the temperature. The test assembly, (followed by the provided components) were assemble with a coating of 505 alloy braze paste and placed in the lab test coil per the attached photographs) A heat cycle 5 – 5.2 seconds was found to flow the alloy and make the joint. Test 2: The smaller tube assembly (condenser tube) was assembled and a ring from the supplied braze alloy (silver solder) was formed and place at the intersection of the two tube . A heat time of 2 seconds was sufficient to flow the alloy and complete the joint. Results/Benefits:

1. As demonstrated, the DW-UHF-10kw induction brazing system is capable of induction heating both the largest and smallest tube to tube sections to complete a brazed joint. Heat times using an available test coil are within the production heat time expectations required by FLDWX
2. HLQ will require a full assembly for review in order to develop the final induction heating coils design that can accommodate all 12 joints indicated on your layout photograph. It is necessary to know and see the clearances between the tube connections to be brazed and the steel compressor section to insure that the steel housing is not affected by the resulting RF field created at the load coil. This final design may require the addition of ferrite materials in the coil that will serve to focus the RF field to the copper leads and not to the steel housing.
3. Initial tests were completed on the DW-UHF-10 kW utilizing an available lab coil. The production induction heating coil will be contained in a none-conductive housing that will permit the operator to use it to locate the coil against the copper leads for accurate and positive heating location for the braze process. The production coil design will incorporate shorter leads than the test coil and be configured such that the heat cycles will be improved (shorter heat times).

1. HLQ can provide the system with an optional process control. This will effectively be a programmed process cycle that will be developed for each joint listed on the assembly photograph supplied with the application request from FLDWX. Each of the 12 joints will be programmed sequentially to accommodate each particular joint – this will permit the operator to move in the same sequence as programmed from joint 1 to joint 12. Each cycle of the U induction brazing coil/handle will move the process from joint 1 (heat time and % of power) to joint 2 (heat time and % power) etc. though to joint 12. The sequence, once entered, would need to be followed for each assembly. This will take the guess work out of braze time per joint to provide repeatability in the process.

1. Another option for consideration would be to consider the HLQ Robotic Arm option. This option supports the induction brazing coils/ coil housing and actuates the assembly when programmed to place the coil at each joint area. The support arm rotates and moves the coil/coil housing to the proper position and angle for each joint assuring the soil position and heat time.

Induction Preheating Hot Rod Heading

Induction Preheating Hot Rod Heading With IGBT Heating Units Objective Heat a waspaloy rod to 1500ºF (815.5ºC) for hot heading application Material Waspaloy rod 0.5” (12.7mm)OD, 1.5” (38.1mm) length, ceramic liner Temperature 1500 ºF (815.5ºC) Frequency 75 kHz Equipment • DW-HF- 20 kW induction heating system, equipped with a remote workhead containing two 1.32μF capacitors for a total of .66μF • An induction heating coil designed and developed specifically for this application. Process A seven turn helical coil is used to heat the rod. The rod is placed inside the coil and power is applied for two seconds providing enough heat to penetrate the inner core. An optical pyrometer is used for close loop temperature control and a ceramic liner is used so the rod does not touch the coil. Results/Benefits Induction heating provides: • Low pressure and minimal residual stress • Better grain flow and microstructure • Even distribution of heating • Improved production rates with minimal defects

High Frequency Induction Brazing Diamond Inserts

High Frequency Induction Brazing Diamond Inserts Objective: Induction Brazing diamond inserts to a steel drilling ring Material : • steel ring and diamond inserts • Braze shim preform • Flux Temperature :1300 – 1350 (700 – 730) °F (°C) Frequency :78 kHz Equipment: DW-HF-15kW, induction heating system, equipped with a remote heat station containing two 0.5 μF capacitors (total 0.25 μF) An induction heating coil designed and developed specifically for this application. Process: A multi-turn, internal-external helical coil (A) is used to generate the required heating pattern. Initial tests on the ring alone determine system tuning. Flux is applied to the part and the braze shims are inserted into the counter-bored holes (B). This is followed by the synthetic diamonds. The part is loaded into the coil and weight is placed onto the diamonds (C). RF Induction Heating power is applied until the braze flows. The power is turned off and the part air cools to room temperature. Results/Benefits • reduced ring warping compared to furnace induction heating • decreased cycle time due to reduced ramp-up and cooldown times

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.