DW-HF-45KW High Frequency Induction Brazing & Soldering Machine

Quick Answer

What is the DW-HF-45KW Induction Brazing and Soldering Machine? The HLQ DW-HF-45KW is a high-frequency induction heating system designed for industrial metal joining, including copper tube brazing, brass fitting brazing, carbide tool brazing, and selected electrical soldering applications. The manufacturer publishes a maximum oscillation rating of 45kVA, a maximum input rating of 50kVA, an operating frequency range of 30–80kHz, and a three-phase 380V, 50/60Hz electrical supply. The system uses an IGBT inverter, a separated heating unit, and application-specific water-cooled copper induction coils to generate localized electromagnetic heating.

Best-Fit Applications: HVAC copper pipe brazing, refrigeration tube connections, copper-to-brass fittings, carbide tool joining, electrical copper connectors, selected stainless steel assemblies, and industrial brazing workstations.

Engineering Selection: The DW-HF-45KW should be selected according to the joining process, base materials, filler metal, joint geometry, target temperature, effective heated mass, heating cycle, operating frequency, coil design, and cooling conditions. The published 45kVA maximum oscillation rating is not equivalent to 45kW of guaranteed useful heating power delivered to the workpiece.

Table of Contents

1. What Is the DW-HF-45KW Induction Brazing & Soldering Machine?
2. Key Applications
3. Suitable Materials
4. Working Principle
5. Technical Specifications
6. Recommended Model Selection
7. Process Workflow
8. Common Problems and Solutions
9. Engineering Selection Guide
10. Advantages and Limitations
11. Why Choose HLQ?
12. 10 Core FAQs

What Is the DW-HF-45KW Induction Brazing & Soldering Machine?

The DW-HF-45KW Induction Brazing and Soldering Machine is an industrial electromagnetic heating system designed to heat electrically conductive metal assemblies during brazing, soldering, and selected localized heat-treatment operations.

The system converts three-phase electrical power into high-frequency alternating current. This current flows through an induction coil, generating a changing magnetic field around the workpiece.

The changing magnetic field induces electrical currents in conductive metal components. Electrical resistance converts the induced currents into heat, allowing the joining area to reach the required processing temperature.

Unlike fusion welding, induction brazing and induction soldering do not require the base materials to melt. A compatible filler metal melts, wets the prepared joining surfaces, and solidifies to form the connection.

The DW-HF-45KW uses a separated equipment arrangement consisting of a main power unit and an extension unit. This configuration provides installation flexibility when the heating station must be positioned near industrial fixtures or production equipment.

Main Components of the DW-HF-45KW System

Induction Brazing vs. Induction Soldering

Induction brazing and induction soldering both use electromagnetic induction as a heating method. The fundamental difference is the liquidus temperature of the filler metal.

Brazing uses a filler metal with a liquidus temperature above 450°C and below the solidus temperature of the base materials.

Soldering uses a filler metal with a liquidus temperature at or below 450°C.

Both processes require compatible base materials, correct surface preparation, suitable filler metal, and controlled heating.

Technical Note: The DW-HF-45KW operating frequency range does not establish that every low-temperature soldering application is suitable. Very small electronic joints may require lower-power or higher-frequency equipment, specialized coils, and more precise temperature control.

Key Applications

The DW-HF-45KW can be considered for different industrial joining and heating applications. The correct configuration depends on the material combination, workpiece geometry, filler metal, and production requirements.

1. Copper Tube Induction Brazing

Induction brazing is commonly used to join copper tubes, elbows, connectors, and compatible fittings.

A suitably designed induction coil concentrates the heating field around the joining area. The base materials are heated to the required brazing temperature so that the selected filler metal can wet the surfaces and flow into the joint.

The process is relevant to HVAC, refrigeration, heat exchangers, and industrial copper piping.

2. Copper-to-Brass Fitting Brazing

Copper tubes and brass fittings may be joined through induction brazing using a compatible filler metal.

The heating process must account for differences in component geometry, thermal conductivity, and mass.

Excessive heating of brass components should be avoided because zinc-containing alloys can be sensitive to overheating and may produce hazardous fumes.

3. Carbide Tool Brazing

Induction heating can be used to braze suitable carbide cutting tips to steel tool holders.

The induction coil must provide the required heating at the brazing interface while limiting excessive temperature gradients between the carbide and steel components.

The filler metal, joint clearance, and cooling procedure must be selected according to the tool requirements.

4. HVAC and Refrigeration Connections

Induction brazing can be integrated into manufacturing processes involving copper refrigeration pipes, compressor connections, manifolds, and related fittings.

Repeatable coil positioning and controlled heating cycles support consistent production when the complete joining procedure has been validated.

5. Electrical Connector Soldering

The equipment may be evaluated for soldering suitable copper connectors, busbars, terminals, and other electrically conductive assemblies.

However, the heating cycle must be selected according to the solder alloy and the temperature limits of nearby insulation or other sensitive components.

6. Industrial Metal Joining

Selected steel, stainless steel, copper, and brass components can be heated for compatible brazing operations.

Dissimilar-material assemblies may require specialized filler metals, carefully controlled temperatures, and customized induction coil geometry.

For an application example involving copper tube joints, see HLQ’s induction brazing copper tubing application.

Suitable Materials

Induction brazing and soldering can be used with many electrically conductive metals. However, electromagnetic heating suitability and metallurgical joining compatibility must be evaluated separately.

Electrical resistivity, magnetic permeability, thermal conductivity, joint geometry, and filler metal properties influence the required equipment configuration.

Base Material Compatibility

Brazing Filler Metal Selection

A suitable filler metal must be selected according to the base materials, intended service environment, joint design, and mechanical requirements.

Induction heating can supply the required thermal energy, but it cannot compensate for an incompatible brazing alloy.

Solder Alloy Selection

For induction soldering, the filler metal must be selected according to the electrical, mechanical, and thermal requirements of the joint.

Common solder families may include tin-based alloys, but the actual solder specification must be selected for the application.

For additional soldering examples, review HLQ’s induction soldering applications and technical examples.

Working Principle

The DW-HF-45KW operates according to electromagnetic induction.

The main power supply converts three-phase industrial electricity into high-frequency alternating current using an inverter-based electrical circuit.

This current flows through a water-cooled copper induction coil and generates a changing magnetic field.

When a conductive metal component is positioned within the effective magnetic field, electrical currents are induced inside the workpiece.

Electrical resistance converts the induced currents into heat.

During brazing or soldering, the base materials are heated to the required joining temperature. The selected filler metal melts, wets the prepared surfaces, and forms the joint after cooling.

Electromagnetic Induction Heating Process

Induction Frequency and Heating Distribution

The DW-HF-45KW product page lists an operating frequency range of 30–80kHz.

Operating frequency influences the distribution of induced electrical currents within the workpiece.

Under simplified electromagnetic conditions, higher frequencies produce a smaller reference electrical penetration depth.

However, the final temperature distribution also depends on heating duration, thermal conduction, material properties, and workpiece geometry.

For a suitable homogeneous material, the reference electrical skin depth can be estimated using:

δ = √[ρ / (π × f × μ)]

Where:

• δ = Reference electrical skin depth, in meters.
• ρ = Electrical resistivity, in Ω·m.
• f = Operating frequency, in Hz.
• μ = Absolute magnetic permeability, in H/m.

Engineering Note: Electrical skin depth is not identical to the final heating depth or temperature penetration depth. Actual heating performance must be evaluated under the selected operating conditions.

Induction Coil Design

The induction coil determines the distribution of the electromagnetic field around the workpiece.

Its geometry, turn spacing, active heating length, coupling distance, and electrical matching influence the heating pattern.

For copper tube brazing, helical coils are frequently considered because they can surround the joint.

For restricted-access assemblies, split, U-shaped, pancake, or custom-profile coils may be required.

For specialized coil configurations, see HLQ’s custom induction brazing coil design guide.

Technical Specifications

The following technical specifications are based on the original HLQ DW-HF-45KW product page.

Actual electrical ratings, cooling requirements, operating duty, and supplied control functions should be verified using the technical documentation for the delivered machine.

DW-HF-45KW Published Specifications

Electrical Rating Interpretation

The manufacturer’s original specifications list a maximum oscillation rating of 45kVA and a maximum input rating of 50kVA.

Apparent electrical power, active electrical power, inverter output power, and useful workpiece heating power are different quantities.

Three-Phase Input Current Calculation

For a balanced three-phase electrical system:

S = √3 × Vline × Iline

Where S is apparent power, Vline is line voltage, and Iline is line current.

For a theoretical 50kVA three-phase input at 380V, the corresponding line current is approximately 76A.

This is a reference calculation, not a verified DW-HF-45KW operating-current measurement.

Cooling System Requirements

The DW-HF-45KW is a water-cooled induction heating system.

The cooling circuit must provide sufficient heat removal from the induction coil and designated power electronics.

Illustrative Cooling Water Calculation

The theoretical heat removed by a water-cooling circuit can be estimated using:

P = mflow × Cp × ΔT

For an illustrative water flow of 6L/min and a water temperature increase of 8°C, the theoretical heat removal is approximately 3.34kW.

This value is an engineering example, not a measured DW-HF-45KW cooling load.

Recommended Model Selection

The correct induction brazing or soldering machine must be selected according to the complete joining process rather than nominal machine rating alone.

Joint mass, filler-metal melting temperature, heating cycle, operating frequency, and coil geometry all influence the required equipment.

Application-Based Model Selection

Selection Qualification: The table above provides initial equipment-screening categories rather than guaranteed model capacities. Final selection requires material and workpiece information and, where necessary, representative application testing.

DW-HF Product Family Comparison

For the general equipment configuration and other applications of this power class, review HLQ’s DW-HF-45KW high-frequency induction heating equipment guide.

Process Workflow

A controlled induction brazing or soldering process involves material identification, joint preparation, filler selection, coil positioning, heating, cooling, and inspection.

Standard Induction Brazing Process

Induction Soldering Process

Induction soldering follows a related workflow but operates with a filler metal whose liquidus temperature does not exceed 450°C.

Many soldering applications require tighter control of thermal exposure because nearby electrical insulation, coatings, or other components may be temperature-sensitive.

Control System and Production Repeatability

The DW-HF-45KW product page describes constant-current and constant-power operation, along with timer functions available on selected configurations.

For industrial production, these functions can help establish repeatable heating cycles.

The exact control modes, timer ranges, and temperature-monitoring options must be verified for the supplied machine.

Common Problems and Solutions

Induction brazing and soldering defects may result from incorrect heating conditions, unsuitable filler metals, joint contamination, inconsistent coil positioning, or electrical and cooling problems.

Engineering Selection Guide

Correct induction brazing and soldering machine selection begins with the complete joining process rather than only the advertised power rating.

Step 1: Define the Joining Process

Determine whether the application requires induction brazing or induction soldering.

The process classification depends on the liquidus temperature of the selected filler metal.

Step 2: Identify the Base Materials

Specify the actual metal grades, component dimensions, wall thicknesses, and relevant coatings.

Step 3: Select the Filler Metal

Choose a compatible filler alloy and confirm the melting range, flux requirements, joint properties, and service conditions.

Step 4: Evaluate Joint Geometry

Determine joint clearance, overlap length, accessibility, surrounding conductive materials, and available coil clearance.

Step 5: Define the Target Temperature

Specify the required joining temperature according to the filler metal and base-material limitations.

Step 6: Calculate the Effective Heated Mass

The effective heated mass may include only the joint and adjacent metal regions that become hot during the heating cycle.

This mass may be significantly different from the total weight of the assembly.

Step 7: Estimate Heating Energy

For a simplified sensible-heating calculation:

Q = m × Cp × ΔT

Where:

• Q = Theoretical useful thermal energy, kJ.
• m = Effective heated mass, kg.
• Cp = Approximate mean specific heat capacity, kJ/kg·K.
• ΔT = Temperature increase, K.

Engineering Example A: Copper Brazing

Consider a hypothetical copper joint assembly with an effective heated mass of 0.30kg.

Assume the copper is heated from 25°C to 725°C using an approximate mean specific heat capacity of 0.43kJ/kg·K.

The theoretical heating energy is:

Q = 0.30 × 0.43 × 700 = 90.3kJ

This is equivalent to approximately 0.0251kWh of useful thermal energy.

Engineering Example B: Copper Connector Soldering

Consider a hypothetical copper connector with an effective heated mass of 0.08kg.

Assume the connector is heated from 25°C to 240°C using an approximate mean specific heat capacity of 0.39kJ/kg·K.

The theoretical heating energy is:

Q = 0.08 × 0.39 × 215 = 6.708kJ

This is equivalent to approximately 0.00186kWh of useful thermal energy.

Step 8: Compare Heating Time and Power

For the same theoretical copper brazing heat requirement of 90.3kJ, the useful thermal power changes with heating time.

Engineering Qualification: These figures are theoretical estimates rather than measured DW-HF-45KW performance. The assumed 50% electrical-to-workpiece heating efficiency is used only to illustrate the relationship between useful heating energy and electrical input.

The calculations exclude detailed temperature-dependent material properties, fixture heating, filler melting, electromagnetic losses, radiation, and other process effects.

Step 9: Select the Induction Coil

Choose a coil according to joint dimensions, workpiece accessibility, electrical matching, and required temperature distribution.

Step 10: Verify Electrical and Cooling Requirements

Confirm the three-phase electrical supply, actual input current, power factor, cooling-water flow, inlet pressure, operating temperature, and protection functions.

Step 11: Validate the Application

Where practical, perform a representative application test using actual materials and joint assemblies.

Record the heating cycle, joint temperature, filler-metal flow, electrical input, cooling conditions, and applicable quality results.

Published HLQ Application Reference

HLQ has published a separate copper tube induction brazing test using a DW-UHF-10KW induction system and an available split laboratory coil.

The reported test involved heavy-wall 5/16-inch copper tubing and brazing paste, with a temperature reference of approximately 815°C and a heating time of approximately 5.0–5.2 seconds.

This example demonstrates the importance of coil design, workpiece positioning, and controlled heating during induction brazing.

It does not establish guaranteed DW-HF-45KW heating time or production capacity.

Recommended Factory Acceptance Test

Advantages and Limitations

Advantages of DW-HF-45KW Induction Brazing and Soldering Equipment

Limitations and Engineering Considerations

Why Choose HLQ?

HLQ Induction Equipment Co., Ltd. provides induction heating equipment for brazing, soldering, hardening, annealing, forging, melting, and other industrial metalworking applications.

The DW-HF-45KW belongs to HLQ’s high-frequency induction heating product range and can be evaluated for different industrial joining processes.

Application-Based Equipment Selection

Equipment selection can be based on material properties, joint dimensions, filler metal, target temperature, heating cycle, production requirements, and available factory utilities.

IGBT High-Frequency Inverter Technology

The original DW-HF-45KW product page describes IGBT inverter technology and high-frequency operation.

The actual electrical configuration should be verified for the supplied machine.

Custom Induction Coil Solutions

Different brazing and soldering assemblies may require different coil geometries.

Coil selection should consider electromagnetic coupling, operating frequency, electrical matching, mechanical clearance, and cooling.

Industrial Joining Applications

The equipment can be considered for copper tube joints, brass fittings, carbide tools, electrical connectors, and other qualified industrial joining processes.

Engineering Process Validation

Representative application testing can help verify the required heating time, joint temperature, filler-metal flow, and production repeatability.

For a wider selection of joining equipment, review HLQ’s industrial induction brazing machine range.

10 Core FAQs

1. What is the DW-HF-45KW induction brazing and soldering machine?

The DW-HF-45KW is a high-frequency induction heating system designed for industrial joining and localized metal heating. Typical applications include copper tube brazing, brass fitting brazing, carbide tool joining, and selected electrical soldering operations.

2. What is the rated power of the DW-HF-45KW?

The original product page publishes a maximum oscillation rating of 45kVA and a maximum input rating of 50kVA. These electrical ratings do not establish 45kW of useful thermal power absorbed by a workpiece.

3. What electrical supply does the machine require?

The published electrical input is three-phase 380V, 50/60Hz. Actual input current, electrical protection, voltage tolerance, and installation requirements should be confirmed from the equipment datasheet.

4. What is the operating frequency?

The original product page lists an operating frequency range of 30–80kHz. The actual loaded frequency depends on the induction coil, resonant matching, and workpiece characteristics.

5. What is the difference between induction brazing and induction soldering?

Induction brazing uses a filler metal with a liquidus temperature above 450°C, while induction soldering uses a filler with a liquidus temperature at or below 450°C. Both processes use induction heating and do not intentionally melt the base materials.

6. Can the DW-HF-45KW braze copper tubes and brass fittings?

Yes, the equipment can be considered for suitable copper tube and brass fitting brazing applications. Actual performance depends on joint geometry, component mass, filler metal, induction coil, and heating conditions.

7. Can the DW-HF-45KW solder copper electrical connectors?

It may be suitable for selected electrical connector soldering applications. However, the solder alloy, connector mass, nearby insulation, and required temperature control must be evaluated. Very small or temperature-sensitive assemblies may require more specialized equipment.

8. How much cooling water is required?

The original product page lists a cooling-water flow of at least 6L/min and includes a 0.3MPa pressure reference. The required total flow, permitted operating pressure, inlet temperature, and water quality must be confirmed for the supplied system.

9. Can the equipment operate continuously?

The manufacturer publishes a 100% duty-cycle claim at 30°C. Actual continuous operation depends on the electrical load, cooling performance, ambient conditions, and equipment configuration. These conditions must be verified before installation.

10. How should the correct induction brazing or soldering machine be selected?

Selection should consider the joining process, base materials, joint dimensions, filler metal, target temperature, effective heated mass, required heating time, production capacity, electrical supply, coil design, and cooling conditions. Representative application tests can provide the basis for final equipment selection.

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