TECNA TE7903 HVAC & Sheet Metal Spot Weld Gun – 6 kVA
HVAC / sheet-metal application?
We’ll help match power, reach, cooling and production rate to the right TECNA model.
TECNA TE7903 HVAC & Sheet Metal Spot Weld Gun – 6 kVA
Description
Description
HVAC Quick Fit — TECNA TE7903
The TE7903 is the portable 6 kVA step-up for HVAC and light sheet-metal production. TECNA positions this water-cooled hand-operated gun for high operating-rate work and thin sheet applications, making it a better fit than the TE7902 when the shop is welding throughout the day.
Good fit for
Duct fittings, plenums, collars, equipment cabinets, brackets and repetitive light-gauge sheet assemblies.
Why choose it
6 kVA output, full water cooling, adjustable weld control and a wide range of arms/electrodes.
Move up when
You want pneumatic clamping, a suspended balanced gun, a pedestal station or a higher-capacity stationary welder.
HVAC application note
For coated or galvanized duct sheet, establish weld settings on the actual material and maintain the electrode tips as the coating affects contact resistance and electrode wear.
TECNA manufacturer technical reference ↗
| TECNA TE7903 Portable Spot Weld Gun Specifications | |
|---|---|
| Model | TECNA TE7903 |
| Gun Type | Scissor |
| Operation | Manual |
| Nominal Power (50% Duty Cycle) | 6 kVA |
| Continuous Power | 4.25 kVA |
| Maximum Short Circuit Power | 20.5 kVA |
| Maximum Welding Power | 16 kVA |
| Secondary No-Load Voltage | 2.5 V |
| Supply Voltage | 220V / 60 Hz (In Stock) 440V / 60 Hz (Available Upon Request) |
| Connection Power | 13.5 kVA |
| Delayed Fuse | 20 A @ 220V / 12 A @ 440V |
| Primary Cable (up to 15 m) | 0.004 in² (2.5 mm²) |
| Nominal Current | 2.4 kA |
| Continuous Current | 1.7 kA |
| Short Circuit Current | 8.2 kA |
| Maximum Welding Current | 6.55 kA |
| Duty Cycle @ Maximum Welding Current | 6.7% |
| Arm Length Range | 5.91 - 19.69 in. (150 - 500 mm) |
| Arm Gap | 3.70 in. (94 mm) |
| Arm Diameter | 0.87 in. (22 mm) |
| Arm Holder Diameter | 0.71 in. (18 mm) |
| Electrode Holder Diameter | 0.55 in. (14 mm) |
| Electrode Taper | Ø0.43 in. / 5° (10.8 mm / 5°) |
| Electrode Stroke | 2.17 - 7.28 in. (55 - 185 mm) |
| Electrode Force (150 mm Arms) | 264 lb (120 daN) |
| Electrode Force (500 mm Arms) | 84 lb (38 daN) |
| Compressed Air Required | Not Required |
| Water Cooling | Required |
| Water Connection | 0.24 in. (6 mm) |
| Maximum Water Pressure | 2.5 bar |
| Cooling Water Consumption | 150 L/h (Full Load) |
| Mild Steel Capacity | 2 + 2 mm (0.079 + 0.079 in.) |
| Recommended Accessories | |
| Recommended Tool Balancers | TECNA 9356 and TECNA 9357 |
HVAC / duct fabrication focus
Where this TECNA model fits in an HVAC shop
Higher-rate portable HVAC work
Busy duct shops making fittings, plenums, cabinets and repeat assemblies. Resistance spot welding is strongest where overlapping sheet can be clamped from both sides and the joint only needs discrete welds rather than a continuous airtight seam.
TECNA HVAC model ladder
Choose by shop size and production style
TE7902
Small shops, intermittent fittings and simple portable use. No air or water required.
View model → Portable • 6 kVATE7903
Higher-rate hand welding with water cooling; no compressed air required.
View model → Suspended • 6 kVATE7913
Pneumatic, water-cooled and balanced for repetitive multi-angle production.
View model → Pedestal • 6 kVATE7915
Dedicated fixed station for recurring fittings and light production work.
View model → Stationary • 25 kVATE4649N
Established duct shops needing deeper reach, more force and production duty.
View model → Production • 50 kVATE4663NX
Highest-capacity option here for large parts, deep access and demanding output.
View model →HVAC Spot Welder Fit Check
Send the duct-shop application. We’ll narrow the machine.
You do not need to know the TECNA model. Gauge, material, part type, access, weld rate and available shop services are more useful than guessing at kVA.
24–26 ga galvanized • spin-in collars + square-to-round fittings • 50–100 welds/day • portable preferred • 230 V available • no water loop.
