TECNA 6121N press-type spot/projection welder — 90 kVA, air-operated MFDC/inverter (440 V, 60 Hz). Standard electrode force of 1,654 lbs at 6 bar; 15.35 in. electrode throat depth and 10.31 in. projection-plate throat depth.
The TECNA 6121N is a medium-frequency direct-current (MFDC) inverter spot/projection welding machine pairing a 90 kVA (50% duty) transformer with linear-action, air-operated press actuation. Welding current is rectified and supplied at 1000 Hz, giving low line draw and balanced three-phase loading compared with single-phase AC machines. Standard electrode force is 1,654 lbs at 6 bar; the optional higher-force cylinder (Art. 6135) raises maximum electrode force to 2,792 lbs. The 6121N offers a 15.35 in. electrode throat depth and a 10.31 in. projection-plate throat depth for both spot and projection work, with a 0–80 mm adjustable retraction stroke. Transformer, electrode holders, and electrodes are water-cooled for extended duty cycles.
Also available at 480 V as TECNA 6121NX.
| Weight | 1080 lbs |
|---|---|
| Dimensions | 48.9 × 17.3 × 76.3 in |
| Configuration | Spot / Projection |
| Standard Control Unit | TE700 |
| Nominal Power 50% (kVA) | 90 |
| Nominal Power 20% (kVA) | 142 |
| Max Short Circuit Current (kA) | 32 |
| Thermal Current 100% (A) | 6100 |
| No-Load Secondary Voltage (V) | 9.9 |
| Supply | 440 V / 60 Hz |
| Delayed Fuses (440 V) | 100 A |
| Mains Cable (≤30m, 440 V) | 0.05 in² (35 mm²) |
| Min Gap | 6.89 in. (175 mm) |
| Max Gap | 18.70 in. (475 mm) |
| Throat Depth (L) | 15.35 in. (390 mm) |
| Proj Plate Throat Depth (D) | 10.31 in. (262 mm) |
| Projection Plate Dimensions | 4.72 × 5.51 in. (120 × 140 mm) |
| Projection Slots (No. / Pitch) | 2 × 63 mm |
| Max Elec Force 6 bar (Std) | 1654 lbs (736 daN) |
| Max Elec Force 6 bar (6135) | 2792 lbs (1242 daN) |
| Max Electrode Stroke | 3.94 in. (100 mm) |
| Double Stroke (Std, Adj) | 0.00–3.15 in. (0–80 mm) |
| Compressed Air Supply | 94 psi (6.5 bar) |
| Arm Ø | 2.36 in. (60 mm) |
| Electrode-Holder Ø | 1.26 in. (32 mm) |
| Electrode Taper Ø | 0.75 in. (19.05 mm) |
| Electrode Taper Standard | 2MT / 5RW |
| Water Cooling | 2.64 gpm (10 lpm) |
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