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| Company Info. |
| Haifei Intelligent equipment Co., Ltd. |
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| Product List |
Items Model | Unit | HFDB-200 |
| Rated capacity | KVA | 240 |
| Power supply | V/Ø/Hz | 380V±10% / 3 phases / 50Hz |
| Rated duty cycle | % | 20% |
| Primary current Max. | A | 150 |
| Primary cable | mm2 | 3*50+2*16 |
| Short-circuit current Max. | KA | 58 |
| Secondary voltage | V | 9.6 |
| Air pressure cylinder | Ø*L | Ø160*120/Ø200*120 |
| Working pressure Max. (0.5/10.5MPa) | KN | 10/15 |
| Cooling water demand | / | 0.2～0.3MPa,40 micron filtration, Resistivity of 5 kΩ. cm |
| Cooling water consumption | L/Min | 35 |
| Throat depth | mm | 425 |
| Distance between copper plates | mm | 248 |
| Working environment | Temperature: 1～45℃ humidity: 35～90％ |
The HFDB-200 MFDC spot welder is a medium-frequency inverter resistance welding machine designed for metal sheets, automotive components, hardware parts, electrical connectors, and non-ferrous metal parts. With medium-frequency DC output, the machine provides more stable welding current and faster current response than conventional AC spot welding equipment, making it suitable for applications that require consistent weld strength and stable batch production.
The machine can be used for spot welding, projection welding, nut and bolt projection welding, and multi-point projection welding. It is suitable for common steel, iron, stainless steel, copper, silver, nickel, and selected alloy materials. In automotive manufacturing, it can be applied to high-strength steel, hot-formed steel, galvanized sheets, and fastener projection welding.
Haifei can provide machine selection, fixture design, electrode matching, sample welding, and automation integration based on the customer’s workpiece drawing, material thickness, weld point position, strength requirement, and production target.
The HFDB-200 uses medium-frequency DC welding output to reduce current fluctuation often found in traditional AC welding. Stable current output helps improve weld consistency, especially for high-strength steel, hot-formed steel, galvanized sheets, and projection welded parts that require controlled heat input.
The machine can be used not only for standard sheet metal spot welding, but also for nut projection welding, bolt projection welding, multi-point projection welding, and selected non-ferrous metal welding applications. For welding tasks that require localized heat concentration, MFDC resistance welding helps control heat distribution and reduce weak welds, spatter, and uneven weld points.
High-strength steel, hot-formed steel, and galvanized sheets are commonly used in automotive manufacturing and require better current response, pressure control, and electrode matching. The HFDB-200 can be used for spot welding and projection welding of these materials, helping customers achieve more stable weld quality.
Different workpieces have different weld point positions, product shapes, loading methods, and positioning requirements. Standard fixtures are not always suitable for every application. Haifei can design dedicated positioning fixtures, electrode structures, clamping methods, and error-proofing mechanisms based on customer drawings.
The HFDB-200 can be used as a stand-alone machine or integrated into semi-automatic and fully automatic welding systems according to production requirements. It can work with automatic feeding systems, nut feeders, workpiece positioning systems, robotic loading and unloading, inspection units, and production line control systems.
The HFDB-200 is suitable for high-strength steel, hot-formed steel, galvanized sheets, brackets, stamped parts, reinforcement plates, and nut or bolt projection welding in automotive component production. Automotive parts usually require stable weld strength, accurate weld position, and consistent batch quality, so the equipment must provide stable current output and repeatable welding control.
The machine can be used for projection welding of nuts, bolts, pins, and fasteners onto sheet metal parts. Projection welding quality is affected by projection height, nut position, fixture accuracy, electrode pressure, and welding current. With dedicated fixtures and electrode structures, the HFDB-200 helps improve consistency and reduce problems such as weak welds, misalignment, and incomplete fusion.
The HFDB-200 can be used for spot welding or projection welding of galvanized sheets, stainless steel sheets, and low-carbon steel sheets. For galvanized sheets, attention should be paid to the effect of zinc coating on electrode wear and welding spatter. For stainless steel, heat input should be controlled to reduce overheating, deformation, and unstable weld appearance.
The machine can also be used for welding copper, silver, nickel, and selected alloy materials, including electrical connectors, terminals, conductive plates, and contact parts. Because copper and silver have high electrical and thermal conductivity, sample welding is recommended to confirm welding current, pressure, electrode material, and joint strength.
The HFDB-200 is suitable for spot welding and projection welding of hardware stamped parts, metal brackets, mounting plates, connecting pieces, reinforcement parts, and other industrial metal components. For multiple models, multiple weld points, or irregular workpieces, custom fixtures can improve positioning accuracy and production efficiency.
Haifei has long-term experience in MFDC spot welding machines and customized automation solutions. Its product range includes MFDC spot welding machines, polymer diffusion welding machines, ultrasonic metal welding machines, capacitor discharge spot and projection welders, MFDC seam welding machines, industry-specific automated welding machines, and related welding equipment.
Haifei does not only provide standard machines. The team can evaluate the welding process based on customer drawings, samples, materials, thickness, weld point quantity, strength requirements, and production targets. This helps reduce the risk of incorrect machine selection, unsuitable fixtures, and long commissioning time.
For high-strength steel, hot-formed steel, galvanized sheets, non-ferrous metals, nut projection welding, and multi-point projection welding projects, sample welding is recommended before finalizing the machine solution. Through sample welding, Haifei can check weld appearance, weld strength, electrode matching, pressure settings, and process stability.
Different workpieces require different weld point positions and clamping methods. This is especially true for automotive parts and irregular stamped components, where positioning accuracy and error-proofing are important. Haifei can provide custom fixtures, electrode structures, welding programs, feeding mechanisms, loading and unloading systems, and automation integration.
The HFDB-200 can be used as an independent MFDC spot welding machine or integrated into an automated welding cell. For high-volume production projects, it can be combined with robots, automatic feeding systems, nut feeders, inspection devices, and data recording functions to form a complete automated welding solution.
Haifei can provide installation guidance, commissioning support, operator training, welding parameter optimization, electrode maintenance advice, and long-term technical support. For production issues such as weak welds, spatter, unstable weld points, or nut detachment, Haifei can help analyze the problem based on the actual workpiece and welding process.
A:The HFDB-200 is suitable for automotive components, hardware stamped parts, galvanized sheets, stainless steel sheets, high-strength steel, hot-formed steel, nut and bolt projection welding, electrical connectors, and selected non-ferrous metal parts.
A:Yes. The HFDB-200 can be used for projection welding of nuts, bolts, pins, and other fasteners. The final welding result depends on nut size, projection height, sheet thickness, fixture positioning, electrode pressure, and welding current.
A:An MFDC spot welding machine provides more stable current output, faster response, and better heat input control. It is more suitable for high-strength steel, galvanized sheets, projection welding parts, and batch production that requires consistent weld quality.
A:It can be used for selected copper, silver, nickel, and alloy welding applications. Because these materials have high electrical and thermal conductivity, sample welding is recommended to confirm welding current, pressure, electrode material, and joint strength.
A:Yes. The machine can be combined with automatic feeding systems, nut feeders, robotic loading and unloading, positioning fixtures, inspection units, and production line control systems to form a semi-automatic or fully automatic welding solution.
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