The Lincoln Electric Power Wave S700 (K3279-1) is a 700-ampere, inverter-based advanced process welding power source representing the top tier of Lincoln's Power Wave S-Series platform. Incorporating Lincoln's Waveform Control Technology™ — the same digital waveform management system used in Lincoln's aerospace and automotive robotic welding systems — the S700 delivers electronically controlled arc waveforms that are continuously optimized during the welding process, providing superior bead appearance, reduced heat input, and minimized spatter across SMAW, GMAW, FCAW, STT® (Surface Tension Transfer), and GTAW processes.
At 700 A with a 100% duty cycle at 600 A, the Power Wave S700 is the appropriate machine for the heaviest welding and gouging tasks in a production environment: large-diameter pipe, heavy structural sections (4 in+ plate), offshore and shipbuilding, and multi-pass high-deposition procedures that demand both maximum output and advanced arc waveform control. The S700's ArcLink® digital communication system integrates fully with Lincoln's Power Feed wire feeder family, enabling process synergy, automated WPS (Welding Procedure Specification) recall, and production data logging.
| Output Type | DC CC / CV / Pulsed GMAW / STT® / Waveform Control |
|---|---|
| Maximum Output | 700 A / 44 V |
| Rated Output | 700 A / 44 V @ 60% duty cycle |
| 100% Duty Cycle | 600 A / 40 V |
| Weld Output Range (CC) | 5 – 700 A |
| Weld Output Range (CV) | 10 – 44 V |
| Input Voltage | 380–575 V, 3-phase, 50/60 Hz |
| Processes | SMAW, GMAW, FCAW, GTAW, SAW, STT®, Pulsed GMAW, RapidArc®, CAC-A |
| Digital Communication | ArcLink® + DeviceNet (optional) |
| Wire Feeder Compatibility | Power Feed 84, 84 Dual, 25M, LN-25 Pro ArcLink |
| Cooling | Inverter, fan-on-demand |
| Weight | 230 lb (104 kg) |
| Dimensions (H × W × D) | 33.5 × 19.5 × 36.5 in |
| Lincoln Part Number | K3279-1 |
- Heavy structural steel fabrication: The Power Wave S700's Waveform Control Technology delivers Lincoln's RapidArc® and Pulse-on-Pulse® processes, enabling deposition rates up to 25 lb/hr on FCAW with 5/64 in wire at high travel speeds — critical for meeting production targets on large bridge, building, and heavy equipment fabrication projects.
- Large-diameter pipeline root bead with STT®: Lincoln's patented STT® (Surface Tension Transfer) process on the S700 provides a low-heat-input, spatter-free root bead on pipe in the 5G and 6G positions — particularly valuable for root passes on P91 chrome-moly pipe and stainless steel pipe where heat input control is critical to metallurgical integrity.
- Offshore platform fabrication: The S700's 700 A output and weld data logging capability (via ArcLink) satisfy the documentation requirements of offshore fabrication quality systems (ISO 3834, DNV-GL, Lloyd's). The machine's ability to store and recall approved welding procedures from the feeder panel reduces operator error in high-consequence environments.
- Carbon arc gouging (heavy plate): At 700 A in CC mode, the S700 drives 1/2 in carbon arc gouging electrodes at full rated capacity — providing the maximum metal removal rate available from a single machine for weld removal, back-gouging, and bevel preparation on heavy structural steel.
- Pulsed GMAW of stainless and nickel alloys: The S700's pulsed GMAW waveforms provide controlled heat input and excellent out-of-position performance for stainless steel (ER308, ER316) and nickel alloy (ERNiCrMo-3) GMAW on critical fabrications in chemical processing, power generation, and marine engineering.
The Power Wave S700 is designed for use with compatible Lincoln wire feeders (Power Feed 84 or 25M) that serve as the primary operator interface. Standalone operation (without ArcLink feeder) uses the front-panel controls only.
- Input power: Connect 380–575 V, 3-phase to the rear terminal block. Set the internal tap to match your facility voltage per Lincoln document IM877. Tighten all input terminals to 50 ft-lb torque.
- ArcLink feeder connection: Connect the Power Feed 84's ArcLink cable to the S700's ArcLink port (front or rear, depending on installation). The feeder's interface panel activates and displays the stored welding procedures. Select the WPS appropriate for your material, joint type, and position.
- STT® root bead setup: Select STT process on the feeder's process menu. Input wire diameter and shielding gas type. The S700 auto-configures the background current, peak current, and pinch current waveform parameters based on Lincoln's STT database for the selected consumable/gas combination.
- Pulsed GMAW setup: Select Pulse process on the feeder, choose wire type/diameter and gas. The S700's waveform library automatically configures the Pulse-on-Pulse or standard pulse waveform. Fine-tune arc length with the trim control (arc length adjust) on the feeder panel.
- SMAW setup: Select CC mode, set amperage via front panel or remote control, connect electrode holder and work cable to Twist-Mate output terminals. The S700's arc force (DIG) control adjusts for electrode type (low-dig for low-hydrogen, high-dig for cellulosic).
- Primary interface: Lincoln Power Feed 84, Power Feed 84 Dual, Power Feed 25M (ArcLink)
- Secondary interface: Lincoln LN-25 Pro (ArcLink version) for portable FCAW/GMAW
- DeviceNet option (factory-installed) for integration with robotic welding cells and PLC-controlled automation
- Compatible with Lincoln K924-4 100-ft remote amperage control for SMAW applications
- See also: Lincoln 4-Pack RACK FLEXTEC 650 K3144-1 for multi-operator installations and Lincoln 6-Pack RACK FLEXTEC 450 K2957-2 for higher station count configurations
- Air filter maintenance (critical): The S700 is an inverter machine with internal IGBT (Insulated Gate Bipolar Transistor) modules that are highly sensitive to thermal overload. Clean or replace the foam air filter every 200 hours of operation (or quarterly). A clogged filter causes repeated thermal trips and eventual IGBT module failure — the most expensive S700 repair.
- ArcLink connector inspection: The ArcLink connector experiences wear from daily connect/disconnect cycles. Inspect connector pins annually for bending, corrosion, or carbon tracking. A compromised ArcLink connection causes intermittent process mode failures and arc instability — often misdiagnosed as a power source fault.
- Software updates: Lincoln periodically releases firmware updates for the Power Wave S700 that improve arc performance and expand the waveform library. Contact Lincoln Electric's technical support line (1-888-935-3877) to check if a firmware update is available for your machine's serial number.
- Output cable sizing: At 700 A, use 4/0 AWG copper electrode cables minimum. At 600 A continuous duty, 3/0 AWG is permissible for runs under 15 ft. Undersized cables cause arc voltage loss, heat damage to the cable, and potential fire hazards.
Q: What is Lincoln's STT® (Surface Tension Transfer) process and why does it matter?
A: STT is Lincoln's patented waveform-controlled short-circuit GMAW process that eliminates explosive droplet detachment (the mechanism that creates spatter in standard short-circuit MIG). Instead, the S700 detects the moment a wire droplet contacts the puddle and instantaneously reduces current to near-zero, allowing surface tension to absorb the droplet cleanly. The result is extremely low spatter, low heat input, and precise penetration profile — ideal for root beads on pipe, thin-wall stainless, and out-of-position applications where standard short-circuit MIG produces excessive spatter or burn-through.
Q: Can the Power Wave S700 be used for SAW (submerged arc welding)?
A: Yes. In CV mode, the S700 supports SAW with compatible Lincoln NA-3/NA-5 automatic wire feeders. At 700 A maximum output, the S700 supports SAW with 3/32 in wire at moderate deposition rates. For high-deposition SAW exceeding 700 A, dedicated SAW power sources (Lincoln IDEALARC DC-1000 or DC-1500) are appropriate.
Q: Does the Power Wave S700 have built-in weld data logging?
A: Yes, when connected to a compatible Lincoln Power Feed feeder. ArcLink communication enables the S700 to log arc time, average voltage, average amperage, and wire consumption on a per-arc basis. Data is stored in the feeder's memory or exported to Lincoln's Production Monitoring System (PMS) software for quality management documentation, QA traceability, and WPS compliance reporting.
Q: What is the difference between RapidArc® and standard spray transfer GMAW on the S700?
A: RapidArc® is Lincoln's modified spray transfer process that operates at lower current than standard spray transfer while maintaining the stable, spatter-free arc characteristics of spray. This allows RapidArc to be used in positions (vertical, overhead) where standard spray transfer would be impractical due to puddle gravity flow. RapidArc provides higher deposition rates than pulse GMAW in flat/horizontal positions with equivalent quality.
Q: Is the Lincoln Power Wave S700 suitable for welding in classified (explosive atmosphere) environments?
A: The S700 does not carry Class I, Division 1 (Ex-rated) electrical equipment certification. It must not be used in areas classified as explosive atmospheres under NFPA 70 or NEC Article 500. For welding in classified areas (petrochemical plants during operations, fuel storage areas), consult your safety engineer for appropriate hot work permit procedures and machine location requirements before operating the S700.
Q: Can I run the S700 from a generator in the field?
A: Yes, with a generator of sufficient capacity. The S700 requires a 3-phase generator with total KVA capacity appropriate for the simultaneous welding load (approximately 35–40 KVA at full 700 A welding output, or 20–25 KVA at typical 60% duty cycle production use). Generators with AVR (automatic voltage regulation) are required — a fluctuating generator output can cause arc instability and may trip the S700's input protection circuit. Avoid generators with "dirty" power (high harmonic distortion) from improperly loaded/regulated units.
Q: What is the warranty on the Lincoln Power Wave S700?
A: Lincoln Electric provides a 3-year warranty on the Power Wave S700's main power components (transformer, IGBT module assembly) and a 1-year warranty on all other components including the ArcLink PCB and control system. Warranty claims must be processed through an authorized Lincoln Electric service center. Contact Lincoln Electric warranty services at 1-888-935-3877 with your machine serial number to initiate a warranty claim.