Lincoln Flextec 350X PowerConnect Multi Process Welder / Activ8X Pipe One Pak - K4935-2

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Perfectly tuned for pipe welding applications, the Activ8X Pipe Wire Feeder is the ideal field solution for GMAW and FCAW welding applications out on the pipeline. With weld processes specifically optimized for cross country pipe welding, the Activ8X Pipe allows you to take Lincoln Electric’s industry-leading root-to-cap weld processes – including STT® and Pulsed MIG – right out to the field. In addition, the rugged and compact design provides durability to withstand the harshest conditions, from mud and rain, to extreme heat or cold, delivering the reliability you need to perform in the toughest welding applications.
The Flextec 350X PowerConnect One-Pak allows for compatibility with multiple input voltages from 200-600V, 1 or 3-phase. Also fully compatible with generator power. The Flextec 350X expands the system flexibility with Stick and TIG capabilty.


  • Waveform controlled STT-Field arc for full penetration, full fusion, open root passes on pipe
  • No control cables needed
  • No sense lead needed
  • Portable, compact package
  • CV DC+ only for solid wire and metal core wire
  • Simple setup
  • Easy to use with 4 memory locations
  • 8" diameter spool capacity
  • Additional weld and work power leads required

What's Included

  • Flextec 350X PowerConnect / Activ8X Pipe One-Pak
    • Work Lead 2/0, Tweco to GC500, 15ft. | K4835-2/0-15
    • Activ8X® Pipe (Tweco®) | K4717-1
    • Drive Roll Kit Combination .035 in / .045 in Solid Wire | KP1696-1
    • Magnum® PRO Curve HDE™ 250 Welding Guns | K4531-2-10-45
    • Flextec® 350X PowerConnect® (Tweco) | K4273-1
    • Copper Plus® Contact Tip - 350A, Tapered, .035 in (0.9 mm) - 10/pack | KP2744-035T
    • Magnum® PRO Nozzle - 350A, Thread-on, Flush, 3/8 in (9.5 mm) ID | KP2742-1-38F


Product Weights & Dimensions

Dimensions (H x W x D) 17 in x 13 in x 24 in (432 mm x 330 mm x 609 mm)
Net Weight 156 lbs (70.7 kg)


Machines Processes MIG (GMAW)
Pulsed MIG (GMAW-P)
Max Rating 425A
Output Range by Mode 5-425A
Number of Operators per Machine 1
Machines Communication Technology analog
Wire Feeder Supply Voltage 40VDC
Amphenol Pins (type of connector) 5

Wire and TIG Feeders

Number of driven rolls 2 rolls
Feeder type Portable
Max spool diameter 200mm
Communication Technology CrossLinc
UI type Meters
Max Wire Diameter (Solid) 3/64 in (1.2 mm)
Max Wire Diameter (Cored) 3/64 in (1.2 mm)
Gun Bushing Tweco #2-#4
Wire Feed Speed Range (IPM) 50-700
Max Spool Size (lbs) 15
MIGPulse-WireFeeders Yes
Wire Feeders Processes MIG
Pulsed MIG

Basic Specification

Input Voltage 200-600V/1/3/50/60
Input Current 3 Phase 350A/34V/60%,208-220/220-230/380-415/460/575,45/40/23/19/15
1 Phase 350A/34V/60%, 380-415/460/575, 39/32/26
1 Phase 300A/32V/60%, 200-208/220-230,62/56
Input Hertz 50,50/60,60
Input Power 3 Phase, 200-208/220-230/380-415/460/575 - 50/60 Hz
1 Phase, 380-415/460/575 - 50/60 Hz
1 Phase, 200-208/220-230 - 50/60 Hz
Input Phase 1,1/3,3
Output Range 3 Phase 200-600V: 5-425A Max OCV 80V DC
1 Phase 380-575V: 5-425A Max OCV 80V DC
1 Phase 200-230V: 5-350A Max OCV 67V DC
Rated Output 3 Phase 200-600V: 350A/34V/60% - 300A/32V/100%
1 Phase 380-575V: 350A/34V/60% - 300A/32V/100%
1 Phase 200-230V: 300A/32V/60% - 280A/31V/100%


Typical Application Cross Country Pipeline
LPG & LNG Storage Vessels
Pipeline & Offshore
Power Generation
Process Piping


Warranty 3 years


The VRTEX® Mobile simulates the GMAW (short arc, spray, pulse and STT® metal transfers) and FCAW (Self-shielded and Gas-shielded) processes in the standard system.  SMAW (E6010, E6013, and E7018) is an optional hardware and software kit.

SMAW (Optional on VRTEX® Mobile)

  • E6010 (Fleetweld®® 5P+)
  • E7018 (Excalibur® 7018)
  • E6013 (Fleetweld® 37)


  • Short Arc (.035” SuperArc® L-56)
  • Axial Spray (.045” SuperArc® L-56)
  • Pulse (.045” SuperArc® L-56)
  • STT® Surface Tension Transfer® (.045” SuperArc® L-56)


  • Gas-shielded .045 “ (UltraCore® 71A85)
  • Self-Shielded 5/64” (Innershield® NR-232)

The VRTEX® Mobile comes with 3 welding coupons (Flat Plate, Tee Joint, Groove Joint) that can be used in limited positions.

  • Plate: Flat, Horizontal, Vertical and Overhead
  • Pipe: 2G, 5G and 6G
  • The VRTEX® Mobile supports limited positions:
  • Plate: Flat, Horizontal and Vertical
  • Push and drag GMAW techniques
  • Stringer beads
  • Weave techniques – straight, triangle and box weave

Recently released! The VRTEX® has now expanded language support for Portuguese (Brazilian) and Russian.

Input current: 4A @ 115, 2A @ 230

  • The VRTEX® system requires a space of 8’ L x 8’ D x 8’ H (2.4 m x 2.4 m x 2.4 m).
  • When operating multiple units in one location, alternate between standard and alternate frequency systems (unique part numbers are identified).
  • The VRTEX® system is not designed for operation in harsh environments. Recommendations are listed in the instruction manual.
  • Avoid magnetic fields, conductive and high frequency objects and processes.
  • An uninterruptible power supply (UPS) may be required for protection of the system from power irregularities and/or disruptions
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