Your Leading Transformer Manufacturer

 

A welding transformer converts high-voltage grid power into the low-voltage, high-current energy required to fuse metals instantly. As a transformer manufacturer with 16+ years of experience,By utilizing 100% pure copper and premium magnetic cores, Haifei transformers maximize this electrical induction while minimizing heat loss. Our advanced VPI insulation and integrated water-cooling ensure the unit remains stable and safe during 24/7 heavy-duty operation, providing the consistent power output necessary for high-precision automated welding.

 

 
  • DC Transformer
    Our DC Transformer (HDC Series) is a high-performance power electronic device designed for precision voltage transformation via high-frequency inversion and isolation. Unlike a traditional AC...
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  • Flash Butt Welding Transformer
    The Flash Butt Welding Transformer is the core power component of flash butt welding machines. It efficiently converts high-voltage AC into the low-voltage, high-current power required for flash...
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  • Secondary Rectification Transformer
    Haifei’s Secondary Rectification Transformers (DC & BTDC Series) are engineered for high-precision resistance welding. By delivering a stable, low-ripple DC output, our transformers significantly...
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  • AC Transformer
    The BSAC series AC Transformer is the core energy unit in resistance welding systems, specifically designed for AC spot welding and projection welding machines. This series utilizes a...
    view more
 
Why Choose Us

 

Rich Experience

Founded in 2009, Haifei has grown from a small business to a world-renowned welding equipment manufacturer. The customer-centric, win-win cooperation philosophy makes the company more mature and powerful.

Production Capacity

Our modern 10,000 m² production facility and team of 100+ engineering specialists enable us to deliver innovative, high-performance welding solutions to industries worldwide.

Production Market

Haifei has more than 40,000 successful welding application cases, with customers in Europe, North America, Southeast Asia, India, and other regions.

24H Online Service

If you encounter difficulties in using the product, we will respond to your needs as soon as possible and provide you with the greatest support.

 

Working Principle of Welding Transformers

 

Welding transformers operate based on the principle of electromagnetic induction. They convert high-voltage, low-current input into low-voltage, high-current output, which generates resistance heat at the workpiece contact points, thereby achieving material fusion.

During welding, current flows through the workpiece contact surface. Due to the contact resistance, instantaneous high temperatures are generated, causing the material to locally melt and form a strong weld joint.

The Role of Welding Transformers in Resistance Welding

Welding transformers not only provide the current required for welding, but also directly affect:

A stable transformer can effectively reduce welding defects and improve overall production efficiency.

Flash Butt Welding Transformer

AC transformer

Secondary Rectification Transformer

HAIFEI HDC Transformer

Key Features and Advantages of Our Welding Transformers

 

Highly Stable Current

Output

Optimized electromagnetic design and winding structure effectively reduce current fluctuations, ensuring stable welding processes and improving weld consistency.

01

Highly Efficient and Energy-Saving Design

Utilizing low-loss magnetic materials and optimized structural design reduces energy loss and improves overall equipment energy efficiency.

02

Superior Core

Materials

High-permeability silicon steel sheets and high-purity copper windings ensure long-term stable operation and extend equipment lifespan.

03

Suitable for Multiple Welding Processes

Widely applicable to spot welding, projection welding, butt welding, and automated welding systems, adaptable to various industrial scenarios.

04

Customized Design

Support

Customized services are available for power, structural dimensions, and installation methods based on different customer welding process requirements.

05

Comparison of Welding Transformer Types

 

DC Welding Transformer vs. AC Welding Transformer

DC welding transformers offer more stable output current and higher weld consistency, making them suitable for applications requiring high welding quality. AC welding transformers have a simpler structure and lower cost, suitable for general welding needs.

Medium Frequency DC vs. Secondary Rectifier Transformers

Medium frequency DC systems offer higher control precision and more concentrated energy output. Secondary rectifier transformers are more compact in structure, suitable for integration into specific equipment.

Features of Flash Butt Welding Transformers

Flash butt welding transformers possess instantaneous high current output capability, suitable for butt welding of large cross-section metal workpieces, and widely used in processes such as steel joining.

Summary of Applicable Scenarios for Different Transformer Types

Different types of transformers are suitable for different working conditions, such as thin plate welding, thick plate welding, high-strength materials, and automated production lines. The appropriate type should be selected based on specific requirements.

 

DC & BTDC Series Secondary Rectification Transformer

HAIFEI Secondary Rectification Transformer

 

Single-phase Secondary Rectification Transformer (DC)

MODEL

Rate Power

Primary Power 

Duty Cycle

Rated Input Current

Secondary No-load Voltage

Short Circuit Current

DC-25

25 KVA

380 KVA 50HZ

50%

66A

4V

20KA

DC-63

63 KVA

380 KVA 50HZ

50%

131 A

6.8 V

30 KA

DC-100

100 KVA

380 KVA 50HZ

50%

197 A

7.3V-9.5 V

38 KA

DC-160

160 KVA

380 KVA 50HZ

50%

263 A

9.5-11.8 V

46 KA

DC-200

200 KVA

380 KVA 50HZ

50%

328 A

10.5-12.6 V

53 KA

DC-250

250 KVA

380 KVA 50HZ

50%

421 A

10.8-13.6 V

58 KA

 

Three-phase Secondary Rectification Transformer (BTDC)

MODEL

Primary Power 

Duty Cycle

Secondary No-load Voltage

Short Circuit Current

BTDC-3*100

380 KVA 50HZ

50%

7.3V-9.5V

66 KA

BTDC-3*160

380 KVA 50HZ

50%

9.5V-11.8V

90 KA 

BTDC-3*200

380 KVA 50HZ

50%

10.5V-12.6V

110 KA

BTDC-3*250

380 KVA 50HZ

50%

10.8V-13.6V

125 KA

 

BSAC Series AC Transformer

HAIFEI BSAC Series AC Transformer

 

MODEL

Rate Power

Primary Power 

Duty Cycle

Rated Input Current

Secondary No-load Voltage

Short Circuit Current

BSAC-25

25 KVA

380 KVA 50HZ

50%

66A

4V

20KA

BSAC-50

50 KVA

380 KVA 50HZ

50%

131 A

6.4 V

26 KA

BSAC-75

75KVA

380 KVA 50HZ

50%

197 A

7.3 V

30 KA

BSAC-100

100 KVA

380 KVA 50HZ

50%

263 A

8 V

35 KA

BSAC-125

125 KVA

380 KVA 50HZ

50%

328 A

8.8 V

40 KA

BSAC-160

160 KVA

380 KVA 50HZ

50%

421 A

10 V

46 KA

BSAC-200

200 KVA

380 KVA 50HZ

50%

526 A

10.8 V

53 KA

BSAC-250

250 KVA

380 KVA 50HZ

50%

657 A

11.8 V

58 KA

BSAC-300

300 KVA

380 KVA 50HZ

50%

921 A

12.7 V

63 KA

BSAC-400

400 KVA

380 KVA 50HZ

50%

1052 A

11V - 16V

72 KA

 

DH Series Flash Butt Welding Transformer

HAIFEI Flash Butt Welding Transformer

 

MODEL

Rate Power

Primary Power 

Duty Cycle

Rated Input Current

Secondary No-load Voltage

DH-200

200 KVA

380 KVA 50HZ

50%

526A

4V - 10V

DH-400

400 KVA

380 KVA 50HZ

50%

1053 A

5.5V - 9.5V

DH-600

600 KVA

380 KVA 50HZ

50%

1578 A

5.8V - 11.8V

DH-800

800 KVA

380 KVA 50HZ

50%

2105 A

6.3V - 12.6V

DH-1000

1000 KVA

380 KVA 50HZ

50%

2631 A

6.8V - 13.6V

DH-1250

1250 KVA

380 KVA 50HZ

50%

3289 A

7.3V - 14.6V

 

DC Transformer

 

HDC-5075

HDC-5075

HDC-5075

MODEL

Primary Power

Niminal power at 20% D.C

Short Circuit

Current

Secondary

Non-load Voltage

Turns Ratio

Cooling Water Flow

Insulation Class

Weight

HDC-5075

500 V

1000 Hz

90 KVA

22 KA

8.4 V

60 : 1

8 L/ min

Grade F

13.8 kg

 

HDC-5076

HDC-5076

HDC-5076

MODEL

Primary Power

Niminal power at 20% D.C

Short Circuit

Current

Secondary

Non-load Voltage

Turns Ratio

Cooling Water Flow

Insulation Class

Weight

HDC-5076

500 V

1000 Hz

90 KVA

22 KA

8.4 V

60 : 1

8 L/ min

Grade F

13.8 kg

 

Remark: Parallel output mode for all types of Mid-Frequency transformers, can change it according to the installation size required by the customer.

HAIFEI HDC Transformer

How to Choose the Right Welding Transformer ?

 

When selecting a welding transformer, it's crucial to consider factors such as welding process, material properties, production requirements, and power supply conditions, rather than focusing solely on a single parameter.

Welding Process and Material Factors

Different welding processes (spot welding, projection welding, butt welding, etc.) have different requirements for current output characteristics. Simultaneously, the conductivity and thickness of the material directly affect transformer selection.

Power and Power Supply Matching

The transformer capacity needs to match the actual welding requirements, satisfying the maximum welding current demand while avoiding increased costs due to over-configuration. The factory's power supply conditions must also be considered to ensure stable equipment operation.

Equipment Structure and Application

Select the appropriate structure based on the production method, such as stationary equipment or an automated integrated system. Future expansion needs should also be considered to enhance the long-term value of the equipment.

Stability and Maintenance Factors

A high-quality welding transformer should possess stable electrical performance and excellent heat dissipation design, and be easy to maintain to ensure long-term reliable operation.

Based on this information, Haifei Intelligent Equipment Co., Ltd. can recommend cost-effective and stable welding transformer solutions for you.

 

Operating Instructions and Safety Precautions

 

1

Installation and Wiring Requirements

Connect the power supply and cooling system according to specifications to ensure safe operation of the equipment.

2

Pre-use

Inspection

Check the insulation condition, wiring tightness, and cooling system operation to avoid abnormal operation.

3

Operating Precautions

Avoid prolonged overload operation to prevent overheating, which could affect performance and lifespan.

4

Daily Maintenance Recommendations

Regularly inspect electrical connections and keep the cooling system clean to improve equipment stability.

 

 

Ordering Process

 

 

Send Us Inquiry → Receive Our Quotation → Negotiate Details → Confirm the Sample → Sign Contract/Deposit → Mass Production →Cargo Ready → Balance/Delivery → Further Cooperation

 

Certificate

 

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Payment Terms

 

 

T.T with 30% downpayment, 70%before shipment.
Paypal or West Union also accept.

 

Packaging & Shipping

 

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FAQ

 

Q: How to choose a welding transformer with appropriate power?

A: A comprehensive evaluation should be conducted based on material thickness, welding process, and maximum current requirements.

Q: What are the causes of welding transformer overheating?

A: It may be related to overload operation, abnormal cooling system, or poor wiring.

Q: Do you support customization? What is the lead time?

A: Customization is supported. The specific lead time depends on product specifications and order details.

 

We're well-known as one of the leading transformer manufacturers and suppliers in China. Please rest assured to buy high quality transformer made in China here from our factory. For price consultation, contact us.

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Contact Haifei now to start your project!

Haifei provides comprehensive resistance welding and automated welding solutions, including diffusion welding machines, spot welding machines, seam welding machines, and automated welding equipment, widely used in industries such as new energy, power equipment, and automotive manufacturing.
We offer 24/7 online technical support, ready to answer your questions and respond quickly to your inquiries. Contact us to obtain welding solutions tailored to your production needs.

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