400 A three-phase DC pulse TIG machine on SiC power module — for heavy stainless, pressure vessel, and structural fabrication in Northeast India.
The Shakti TIG-400P SiC is the top-tier TIG welding machine in the Shakti inverter range: a 400-ampere, three-phase, DC pulse machine built on a Silicon Carbide (SiC) power module for maximum thermal efficiency in continuous industrial welding. Where the TIG-200A and TIG-300AS serve light to medium fabrication, the TIG-400P targets heavy fabrication shops, pressure vessel manufacturers, stainless steel chemical equipment fabricators, and structural welding contractors who run the machine for full shifts on demanding thick-section joints.
DC pulse on a 400 A machine is not a marketing feature — it is the parameter that determines whether a 10 mm stainless weld distorts or stays flat, whether a critical pressure-line root pass achieves full fusion without burn-through, and whether a pipe joint in a food-grade or pharmaceutical environment meets the dimensional and surface quality specifications of the job. At 400 A, three-phase input, this machine is designed for permanent installation in a production welding bay on a dedicated three-phase supply, not for site portability.
Guwahati's growing industrial fabrication sector — stainless steel kitchen equipment manufacturers, pressure vessel and tank fabricators, bridge and structural steel contractors, and oil and gas equipment service shops in the Brahmaputra valley industrial belt — is the primary customer for this machine. Government and private steel structure fabrication shops working on NHIDCL bridge projects in Arunachal Pradesh and Nagaland spec the 400 A class for heavy flange and girder TIG work. Food processing equipment fabricators in Assam's growing agro-processing sector use it for hygienic stainless steel fabrication to IS 304 / 316 specification.
The TIG-400P pairs with ESAB or Lincoln Electric TIG wire, tungsten electrode sharpeners, gas lenses for high-purity shielding gas coverage, and foot pedal amperage controls for positional and root pass welding. Multi Trade Combines carries ESAB consumables and welding accessories at the same counter. For high-voltage three-phase installation, our team can advise on supply specifications.
| Brand | Shakti |
|---|---|
| Category | Welding Machines |
| Key specs | 3-PH · DC pulse |
| Output | 400 A, DC TIG and MMA |
| Input | Three-phase, 415 V |
| Features | DC pulse, SiC power module |
| Availability | In stock — price on request |
Three-phase input gives the machine a stable high-power supply suitable for continuous 400 A industrial output without overheating — single-phase machines at 400 A would draw unacceptable current per phase. DC pulse TIG means the welding arc is modulated between a high peak current and a lower background current at a programmable frequency. Pulse reduces total heat input into the weld pool, controlling distortion on thin stainless steel, preventing burn-through on aluminium-adjacent applications, and allowing tighter bead width on critical precision welds. It is the feature that distinguishes a fabrication-grade TIG from a basic DC TIG like the Shakti TIG-200A or TIG-300AS.
The TIG-300AS is a 300 A single-phase pulse-ready machine suited to lighter fabrication and precision welding on pipe, sheet, and structural steel up to around 8 mm. The TIG-400P SiC steps up in three critical ways: 400 A output on three-phase supply, SiC (silicon carbide) power module for higher thermal efficiency and reliability under continuous-duty industrial use, and a factory-calibrated DC pulse function rather than a pulse-ready option. It is the machine for heavy stainless fabrication, pressure vessel welding, and structural TIG joints where output duty cycle and arc stability at high amperage matter more than portability.