CE Certified Mid Frequency DC Multi Point Spot Welder Galvanized Tubes
Overview
The CE Certified Mid Frequency DC Multi Point Spot Welder is a purpose-built pedestal resistance welding system engineered for high-volume galvanized steel tube fabrication. Combining an MFDC inverter power source with a synchronized dual-head configuration, this machine delivers up to two consistent weld points per cycle, enabling tube manufacturers to streamline production without sacrificing joint strength or coating integrity.
Beyond output, this galvanized tube spot welder emphasizes workplace usability and operator safety. The workstation features a roomy fixture area, ergonomically positioned controls, and CE-compliant dual-hand initiation or safety light curtain options, creating a production environment where efficiency, repeatability, and personnel protection operate in balance across every shift.
Key Technical Advantages
Synchronized Dual-Head Welding
Two precisely calibrated welding guns close two separate weld points within a single operating cycle, reducing cycle time by up to half compared with sequential single-point methods and supporting higher throughput on long tube runs.
MFDC Inverter Power Source
Medium frequency DC output provides rapid current response and a stable weld nugget with reduced spatter and heat-affected zone. This aids consistent results on galvanized surfaces where coating loss and porosity commonly challenge conventional AC systems.
CE-Compliant Operator Safeguards
Dual-hand start buttons or an integrated safety light curtain prevent hand access during the weld stroke. Emergency stop and status indication are fitted as standard, giving floor managers and operators clear control of every cycle.
Tool-Free Fixture Changeover
Standard locating blocks and V-blocks can be swapped within minutes to accept galvanized tubes of different diameters. This flexibility makes the unit ideal for job shops and manufacturers handling multiple tube profiles in one production day.
Anti-Corrosion Water Circuit
All cooling waterways receive rust-inhibiting surface treatment and drain independently into the return tank. Real-time observation of outflow enables early detection of blockages, extending component service life and reducing unscheduled downtime.
Adjustable Pressure Head Stroke
The pressure head descent and ascent speeds are user-adjustable, allowing the operator to soften impact on delicate galvanized coatings, lower mechanical noise, and fine-tune electrode force to the specific thickness of each workpiece.
Applications
| Industry |
Typical Workpiece |
Welding Mode |
| Furniture Manufacturing |
Galvanized tube frames for chairs, tables, shelving |
Multi-point projection spot welding |
| Automotive Components |
Brackets, seat frames, exhaust hangers |
Dual-head simultaneous DC welding |
| HVAC & Ventilation |
Duct connectors, galvanized sheet-tube joints |
Projection welding with coated electrodes |
| Agricultural Equipment |
Galvanized tube structures for greenhouses, gates |
Multi-spot resistance welding |
| Storage & Racking Systems |
Uprights, cross beams, galvanized rack components |
Double-point simultaneous spot welding |
Working Principle
The machine converts three-phase mains power into a stabilized medium-frequency DC current through an MFDC inverter. This DC current is delivered to two independently sprung electrode heads which close simultaneously onto the galvanized tube surface. High current passes through the contact interface, generating localized resistance heat that fuses the parent metal into a weld nugget while the electrode force forges the joint. Because the dual heads are synchronized, both welds are completed in one working stroke, keeping heat input contained, coating damage low, and cycle times short for repeatable production quality.
Technical Specifications
| Parameter |
Unit |
DN(B)-100 |
DN(B)-160 |
DN(B)-200 |
DN(B)-250 |
| Rated power |
KVA |
100 |
160 |
200 |
250 |
| Power input |
V |
3φAC 380V |
3φAC 380V |
3φAC 380V |
3φAC 380V |
| Max. short circuit current |
KA |
30 |
35 |
40 |
45 |
| Duty cycle |
% |
50 |
50 |
50 |
50 |
| Max. force |
N |
6000 |
6000 |
10000 |
15000 |
| Electrode length |
MM |
450 |
450 |
450 |
500 |
| Working stroke |
MM |
80 |
80 |
80 |
80 |
| Cooling water consumption |
L/min |
20 |
20 |
20 |
20 |
| Max. welding capacity |
MM |
3.0+3.0 |
4.0+4.0 |
5.0+5.0 |
6.0+6.0 |
After-Sales and Support
- 12-Month Warranty — Full parts and labor coverage for one year from the date of installation; extended protection plans available on request.
- Free Spare Parts Package — Critical wear components such as electrodes, seals, and cooling fittings are supplied with the machine to support immediate maintenance.
- On-Site Commissioning & Training — Our field engineers provide installation supervision, calibration, and hands-on operator training to shorten the learning curve on your floor.
- Remote Technical Support — Video assistance and online diagnostics are available during and after the warranty period; paid service visits and spare part upgrades are also arranged.
Frequently Asked Questions
How does MFDC welding improve results on galvanized tubes compared with AC spot welding?
MFDC current offers faster response and a flatter weld profile, which reduces spatter and limits zinc coating burn-off around the weld zone. The result is a cleaner nugget, lower porosity, and better corrosion resistance on the finished tube assembly.
Can this machine be adapted to different tube diameters without long changeover time?
Yes. The fixture system uses standard locating blocks and V-blocks that can be exchanged in minutes with basic hand tools. This allows quick switching between short production runs of different tube sizes on the same shift.
What safety mechanisms are standard on this spot welder?
The machine is CE-certified and includes dual-hand initiation buttons as standard, with an optional safety light curtain for extra protection. An emergency stop and multi-color status tower light further support safe supervision and fast response to faults.
How do we maintain consistent weld quality during long production runs?
The cooled waterway with transparent return flow allows quick detection of blockages, while the adjustable pressure head preserves electrode alignment. Routine electrode dressing and coolant checks are normally sufficient to maintain repeatable weld quality under continuous use.
What input voltage options are available for international installations?
The standard unit is configured for 3-phase 380V AC, and alternative voltages including 220V and 440V can be arranged at the factory to match your local grid conditions.
Request Your Welding Solution
Send us your workpiece drawings and production requirements. Our engineering team will evaluate your application, configure the optimal solution, and provide a detailed proposal with electrode design and automation integration options.
Send Drawing | Request Welding Test | Get Custom Solution
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