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K3511-1 / Flextec® 650X Multi-Process Welder w/ CrossLinc™ / LF-72 Ready-Pak®

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  • Flextec 650X multi-process welder is a weather resistant multi-process power source for heavy duty applications. Ready-Pak includes the LF-72 basic 2 drive roll wire feeder.


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More Information


  • Use with a wide range of available 3 phase input power.
  • Easy one-knob process selection.
  • Fast arc response means smooth arc action and consistent bead appearance.
  • User weld schedule memory storage allows easy recall of your critical or often repeated weld procedures with applicable feeders (User weld schedule memory settings available only with Power Feed® and Flex Feed® 84 wire feeders).
  • Synergic one knob control over wire feed speed and voltage with applicable feeders (Synergic control available only with Power Feed wire feeders).


  • Components designed to run cool for long life in high temperature environments.
  • Engineered for outdoor use and harsh environments (IP23 rated).
  • Desert Duty® Rated for extreme temperatures up to 55°C.


  • Ideal for large diameter wire or stick welding on thick materials.
  • Compatible with most Lincoln Electric® feeders, including common bench and boom models, portable across-the-arc models and CrossLinc™ or ArcLink®-equipped models.
  • Premium multi-process arc characteristics on all DC wire, stick and TIG processes.


  • Full functionality without control cables.
  • Enables remote procedure setting at the feeder to improve weld quality.
  • Increases arc time with fewer trips to the power source to adjust settings.
  • Improves safety by reducing jobsite clutter.

Product Weights & Dimensions

Dimensions (H x W x D) 21.8 in x 410 in x 29.3 in (554 mm x 410 mm x 745 mm)
Net Weight 387 lbs (175.543 kg)


Machines Processes Stick (SMAW)
Gouging (CAC-A)
Flux-Cored (FCAW)
Flux-Cored Self-Shielded (FCAW-S)
Flux-Cored Gas-Shielded (FCAW-G)
Submerged Arc (SAW)
Machines Communication Technology analog
Wire Feeder Supply Voltage 115VAC
Amphenol Pins (type of connector) 5
Work Lead Connector Type Lug

Wire and TIG Feeders

Number of driven rolls 2 rolls
Feeder type Bench
Configuration Single
Max spool diameter Drum
Communication Technology analog
UI type Simple
Max Rated Output Capable 500A
Max Wire Diameter (Solid) 1/16 in (1.6 mm)
Max Wire Diameter (Cored) 5/64 in (2 mm)
Max WFS 800IPM
Feedhead Configuration Single
Wire Configuration Single
Power Source to Feeder Communication Connector Type 14-pin
Gun Bushing Tweco #2-#4
Max Spool Size (lbs) 60
Max Spool Size (kg) 30
Wire Feeders Processes MIG
Safety Listing CSA Yes
Safety Listing UL Yes

Basic Specification

Input Voltage 380/460/575
Input Current 61/50/40,57/47/38
Input Hertz 50,50/60,60
Input Power 380/460/575/3/50/60
Input Phase 3
Mode Icon CC/CV
Output Range 10-815A
Polarity DC
Rated Output 750A/44V/60%,650A/44V/100%


Typical Application Cross Country Pipeline
Construction & Field Erection
General Fabrication
Heavy Equipment
Heavy Fabrication
Structural Fabrication


Warranty 3 Years
  • Flextec® 650X Multi-Process Welder w/ CrossLinc™ / LF-72 Ready-Pak®
  • Inverter and Wire Feeder Cart | K3059-4
  • Drive Roll Kit Combination .035 in / .045 in Solid Wire | KP1696-1
  • Weld Power Cable - Lug to Lug (3/0, 600A, 60%) - 10 ft (3 m) | K1842-10
  • Control Cable Extension - Male 14 pin to Female 14 pin - 10 ft (3 m) | K1797-10
  • Drive Roll Kit .045 in (1.1 mm) Solid Wire | KP1696-045S
  • Magnum® PRO Curve™ 400 Welding Guns | K2952-2-10-45
  • LF-72 Wire Feeder, Bench Model, Heavy Duty (No Gun) | K2327-7
  • Model 355-2Ar-58010 Flowmeter Regulator Shielding Gas Kit | 3100211
  • Flextec® 650X Multi-Process Welder with CrossLinc™ Technology | K3425-1