Convenient One-Pak for Basic Wire Welding Applications

The Flextec® 350X PowerConnect® / LF-74 One-Pak (K4274-6) is a comprehensive welding system designed for CV MIG welding in shop environments. This package combines the versatile Flextec® 350X PowerConnect® power source with the reliable LF-74 wire feeder.

Highlights

PowerConnect Technology: Automatically connects to any input voltage 200-575VAC, single or three-phase, 50 or 60Hz
Multi-Process Capability: Supports MIG, TIG, Stick, Flux-Cored, and Carbon Arc Gouging
LF-74 Wire Feeder: Perfect for basic wire welding processes
Proven Reliability: Based on field-tested Flextec platform for extreme environments
Easy Setup: All components included in one convenient package

What's Included

Flextec® 350X PowerConnect® (Tweco) (K4273-1)
LF-74 Wire Feeder, Bench Model, Heavy Duty (K2426-5)
Magnum® PRO Curve™ HDE™ 250 Welding Gun (K4531-2-10-45)
8.5 ft (2.6m) input power cord
Drive Roll Kit .035, .045 (0.9, 1.2 mm) Solid Wire (KP1505-1)
Control Cable Extension - 10 ft (3 m) (K1797-10)
Weld Cable Package - 10 ft (3 m) (K1803-2)
Model 355-2Ar-58010 Flowmeter Regulator Shielding Gas Kit

Industries Served

General Fabrication
Maintenance and Repair
Light Manufacturing
Education and Training Facilities
Construction

Key Features

Versatile Input Power: Connects to various input voltages without manual linking
Ultimate Process Flexibility: Supports multiple welding processes
Reliable Performance: Designed for extreme environments
User-Friendly: Easy to set up and operate
Complete Package: Includes all necessary components for immediate use

Benefits of the Flextec® 350X PowerConnect® / LF-74 One-Pak

Convenience: All components in one easy-to-order package
Flexibility: Suitable for various welding applications and input power situations
Reliability: Built on proven Flextec platform for consistent performance
Efficiency: Quick setup and easy operation for increased productivity
Versatility: Capable of handling multiple welding processes

This Flextec® 350X PowerConnect® / LF-74 One-Pak offers a comprehensive and flexible solution for basic wire welding applications, combining power source versatility with a reliable wire feeding system in a convenient package.

Fast, Free Shipping & Easy Returns

At Welders Supply, we prioritize fast, reliable shipping and hassle-free returns. If you’re not fully satisfied with your purchase, you can return it within 14 days for an exchange, credit or refund. Please ensure all products are returned freight paid, in their original packaging, with all materials, manuals and accessories included. A restocking fee of up to 25% may apply based on product condition. Certain restrictions apply to custom orders, PPE and demo items. Call our customer service team at (844) 682-0205 for assistance.

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Specifications

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	201 lbs (91.2 kg)

Machines

Machines Processes	Stick (SMAW) Gouging (CAC-A) Flux-Cored (FCAW) TIG (GTAW) MIG (GMAW) Pulsed MIG (GMAW-P) Flux-Cored Self-Shielded (FCAW-S) Flux-Cored Gas-Shielded (FCAW-G)
Max Rating	425A
Output Range by Mode	5-425 A
Machines Communication Technology	analog digital CrossLinc ArcLink
Wire Feeder Supply Voltage	40VDC
Amphenol Pins (type of connector)	5 14 12
Work Lead Connector Type	Tweco

Wire and TIG Feeders

Number of driven rolls	2 rolls
Max spool diameter	60lb
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
Accesories Communication Connector Type	none
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	200-600/1/3/50/60
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 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
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%

Application

Typical Application

Construction
Cross Country Pipeline
Construction & Field Erection
General Fabrication
Heavy Equipment
Heavy Fabrication
Maintenance & Repair
Offshore
Oil & Gas
Power Generation
Shipbuilding
Structural Fabrication
Structural Welding