Product Parameters
Items Model | Unit | HFDB-320 |
| Rated capacity | KVA | 320 |
| Power supply | V/Ø/Hz | 380V±10% / 3 phases / 50Hz |
| Rated duty cycle | % | 20% |
| Primary current Max. | A | 200 |
| Primary cable | mm2 | 3*70+2*16 |
| Short-circuit current Max. | KA | 76 |
| Secondary voltage | V | 12.5 |
| Air pressure cylinder | Ø*L | Ø200*120/Ø250*120 |
| Working pressure Max. (0.5/10.5MPa) | KN | 15/24 |
| Cooling water demand | / | 0.2～0.3MPa,40 micron filtration, Resistivity of 5 kΩ. cm |
| Cooling water consumption | L/Min | 50 |
| Throat depth | mm | 380 |
| Distance between copper plates | mm | 320 |
| Working environment |
| Temperature: 1～45℃ humidity: 35～90％ |
Product Overview
The HFDB-320 Medium Frequency Spot Welding Machine is designed for
high-strength resistance welding applications, including spot
welding, projection welding, and multi-point welding of automotive
components, metal structural parts, non-ferrous metal parts, and
high-strength sheet materials.
Compared with lower-power spot welding machines, the HFDB-320 is
better suited for workpieces that require a larger welding area,
higher material strength, and higher welding current. With
medium-frequency DC output, the machine provides concentrated
current and stable power delivery, helping to form a consistent
weld nugget in a short time and reducing weld quality fluctuations
caused by unstable current.
This model is suitable for automotive manufacturing, automotive
parts, low-voltage electrical components, metal hardware, home
appliance structures, and new energy-related parts. It is
especially suitable for production scenarios that require strong
welds, consistent weld quality, stable cycle times, and reliable
batch production.
Key Selling Points
1.High Short-Circuit Current for Demanding Welding Applications
The HFDB-320 delivers a maximum short-circuit current of 78 kA, making it suitable for applications that require high welding
current. For high-strength steel, hot-formed steel, galvanized
sheet, stainless steel structures, and thicker automotive
components, the machine provides sufficient welding power to help
form a stable weld nugget.
2.4 × 80 kVA Capacity for Continuous Production
With a rated capacity of 4 × 80 kVA, the HFDB-320 is built for
high-load and high-frequency welding production. For automotive
parts manufacturers, metal structure producers, and mass production
lines, sufficient capacity helps maintain stable welding output and
reduce weld variation caused by insufficient power.
3.Stable Medium-Frequency DC Output
Compared with traditional AC resistance welding, medium-frequency
DC welding provides smoother current output, more concentrated heat
input, and more precise process control.
4.Suitable for Nut, Bolt, and Multi-Projection Welding
Nut projection welding, bolt projection welding, bracket projection
welding, and multi-projection welding are common processes in
automotive parts manufacturing. The HFDB-320 provides strong output
capacity and can apply pressure and current to multiple projections
at the same time, allowing the projections to fuse quickly and form
reliable joints.
5.Compatible with Multiple Metal Materials
The HFDB-320 can be used for welding common materials such as mild
steel, iron, and stainless steel, as well as non-ferrous metals
such as copper, silver, nickel, and selected alloys. Because
different materials have different electrical conductivity, thermal
conductivity, and surface conditions, welding current, electrode
force, electrode structure, and welding time must be adjusted
accordingly.
6.Supports Custom Fixtures and Automation Cells
For automotive parts, irregular structural components, and
high-volume projection welding parts, manual positioning alone is
often not enough to ensure long-term consistency. The HFDB-320 can
be equipped with dedicated fixtures, positioning systems, electrode
assemblies, and automated loading and unloading solutions based on
the customer’s workpiece structure.
Application Areas
1.Automotive Parts Manufacturing
The HFDB-320 is suitable for automotive components that require
high weld strength and consistent quality, such as brackets, seat
frames, body reinforcement parts, connecting plates, nuts, bolts,
mounting seats, hot-formed steel parts, and galvanized sheet
components.
2.Low-Voltage Electrical Components
Low-voltage electrical products often include copper parts, silver
contacts, nickel sheets, conductive connectors, and metal supports.
The HFDB-320 can be used for selected spot welding and projection
welding applications where electrical conductivity, weld strength,
and appearance consistency are required.
3.New Energy and Battery-Related Components
The new energy industry uses many metal connectors, mounting parts,
brackets, and conductive components. The HFDB-320 can be used for
spot welding, projection welding, and connecting plate welding of
selected structural parts used in new energy applications.
4.Home Appliance and Metal Structural Parts
Home appliance manufacturing uses many galvanized sheets, stainless
steel sheets, mild steel sheets, and metal brackets. The HFDB-320
can be used for welding brackets, housing reinforcement parts,
connecting plates, and mounting parts in refrigerators, washing
machines, air conditioners, water heaters, and other appliances.
5.Hardware, Sheet Metal, and Metal Products
For the hardware and sheet metal industry, the HFDB-320 is suitable
for metal workpieces that are thicker, require higher weld
strength, or need multi-point joining. It can be used for welding
metal enclosures, brackets, sheet metal reinforcement parts,
connecting plates, and irregular metal components.
Product Advantages
1.Designed for High-Strength Workpieces, Not Just Small Parts
The HFDB-320 should not be described in the same way as the
HFDB-50, HFDB-100, or HFDB-200. It is more suitable for
applications involving higher current demand, larger welding areas,
multi-projection structures, thick sheet lap joints, and
high-strength materials.
For customers, the main reason to choose the HFDB-320 is not simply
that it can perform spot welding, but that it can handle more
demanding, higher-load, and higher-strength welding conditions.
2.Stable Weld Formation for Consistent Batch Production
Medium-frequency DC output provides more concentrated and stable
welding current, reducing the impact of current fluctuation on weld
quality. In batch production, stable output helps maintain
consistent weld nugget size, penetration, and joint strength.
This is especially important for industries such as automotive
parts, low-voltage electrical components, and home appliance
structural parts, where continuous production stability is
required.
3.Better Process Control for Galvanized Sheet and High-Strength
Steel
Galvanized sheet welding can be affected by spatter, weak welds,
and the influence of the zinc coating on weld nugget formation.
High-strength steel and hot-formed steel require more precise
control of heat input and electrode force.
With medium-frequency DC output and adjustable welding parameters,
the HFDB-320 can be optimized according to material condition to
improve welding stability.
4.Suitable for Nut Projection Welding and Multi-Projection Welding
For automotive nuts, bolts, mounting seats, bracket projections,
and similar workpieces, the HFDB-320 can perform projection welding
with dedicated electrodes and positioning fixtures. Its strong
output capacity makes it suitable for fusing multiple projections
at the same time, helping reduce weak welds, misalignment, and
insufficient joint strength.
5.Custom Welding Solutions Based on Customer Workpieces
Every customer’s workpiece may differ in material, thickness,
structure, number of projections, welding position, and strength
standard. Haifei can evaluate customer samples or drawings and
recommend suitable electrodes, fixtures, welding parameters, and
automation solutions.
This project-based support is more valuable for automotive parts
and customized manufacturing customers than simply purchasing a
standard machine.
6.Expandable into an Automated Welding Unit
The HFDB-320 can be integrated with automatic feeding, rotary
fixtures, robotic loading and unloading, inspection systems, slag
removal mechanisms, and other auxiliary equipment to create an
automated spot and projection welding workstation. This helps
customers increase output, reduce operator variation, and improve
production cycle time.
FAQ
Q1. What materials can the HFDB-320 medium-frequency DC spot
welding machine weld?
A:The HFDB-320 can weld mild steel, iron, stainless steel,
galvanized sheet, high-strength steel, hot-formed steel, copper,
silver, nickel, and selected alloy materials. Because different
materials have different conductivity and thermal behavior, the
final welding parameters should be confirmed through testing based
on material thickness, surface condition, and required weld
strength.
Q2. What is the difference between the HFDB-320 and the HFDB-200?
A:The HFDB-320 is better suited for applications that require
higher welding current, larger welding areas, higher-strength
materials, and multi-projection welding. If the workpiece is
thicker, has more projections, requires higher weld strength, or
needs more stable output for batch production, the HFDB-320 is
generally a more suitable option.
Q3. Can this machine be used for automotive nut projection welding?
A:Yes. The HFDB-320 is suitable for projection welding of
automotive nuts, bolts, mounting seats, and multi-projection parts.
With dedicated electrodes and positioning fixtures, it can help
improve nut positioning accuracy and reduce the risk of
misalignment, weak welding, and thread damage.
Q4. Can the HFDB-320 weld galvanized sheet?
A:Yes. Galvanized sheet welding requires careful control of
current, electrode force, and welding time. If the process is not
properly adjusted, spatter or weak welds may occur. With
medium-frequency DC output, the HFDB-320 can be adjusted according
to sheet thickness, zinc coating condition, and weld requirements
to improve weld stability.
Q5. Is this machine suitable for automated production lines?
A:Yes. The HFDB-320 can be equipped with dedicated fixtures,
automatic feeding systems, rotary stations, robotic loading and
unloading, and inspection devices based on the customer’s workpiece
structure. It can be configured as a semi-automatic or fully
automatic spot and projection welding workstation for automotive
parts, low-voltage electrical components, and sheet metal
production.
