TECNA Press Spot / Projection Welders FOR SALE

AC — Simple, proven and economical

TECNA’s single-phase AC press welders are the traditional choice for general-purpose spot and projection welding. TECNA offers single-phase press welders from roughly 35–315 kVA.

AC makes sense when you’re welding conventional steels, production demands aren’t extreme, electrical infrastructure can support the machine, and lower equipment cost is more important than maximum process efficiency.

Best choice for straightforward spot welding, basic projection welding, mild steel components, job shops, and moderate production.

Three-Phase DC — High current with a balanced electrical load

TECNA’s traditional three-phase DC machines rectify three-phase AC into DC at the secondary. TECNA specifically identifies several advantages versus traditional single-phase welders: higher mains power factor, reduced load on the plant’s primary electrical service, balanced loading across all three phases, reduced effects from magnetic material within the welding loop, and potentially lower installation costs.

TECNA offers three-phase DC spot/projection machines extending into very high power levels—the 6090/6638 family covers configurations from 100 to 630 kVA.

Best choice for heavy projection welding, large components, high-current applications, and plants that want better three-phase electrical balance without moving to an MFDC inverter system.

MFDC — Highest control, efficiency and weld quality

For demanding applications, MFDC is generally the premium technology. Instead of operating directly at normal line frequency, an inverter produces a much higher-frequency waveform that the welding transformer transforms and rectifies into DC.

TECNA MF inverter technology provides finer control of the welding process, reduced energy consumption, smaller transformers, and substantially lower primary power requirements compared with older single-phase AC technology. TECNA’s MFDC range covers approximately 40–600 kVA and up to 200 kA weld current, depending on configuration.

Best choice for high-volume manufacturing, critical projection welds, short weld schedules, HSS, aluminum, titanium, automotive applications, and processes requiring tight repeatability.

Choose AC when you need a reliable, economical resistance welder for conventional spot and projection welding.

Choose three-phase DC when the application requires higher welding currents, reduced magnetic effects, and better distribution of the machine’s electrical load across the plant’s three-phase service.

Choose MFDC when weld quality, process control, energy efficiency, and repeatability are the priorities. For demanding production applications, MFDC is typically the preferred technology, particularly when welding HSS, aluminum, or other challenging materials.