Name: Flextec 350X PC (Tweco)/LF-74 HD One-Pak #K5803-1
Brand: Lincoln Electric
SKU: LINK5803-1

Any Input Voltage 200-600V
CrossLinc w/ TVT
Multi-Process MIG/TIG/Stick
CAC (Carbon Arc Cutting)
Lincoln Electric 3-Year Warranty

Convenient One-Pak for Basic Wire Welding Applications

The Lincoln Electric Flextec® 350X PowerConnect® / LF-74 One-Pak (K5803-1) is a comprehensive multi-process 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.

NEW From Previous Version:

Software Update Capabilities: New models are capable of software updates via USB.
Enhanced Crosslinc® Control: New models now allow remote weld mode changes via Crosslinc, and automatic weld mode selection (Process Select Assist) based on connected Crosslinc Accessory.

Processes

Stick
TIG
Pulsed & CV MIG
Arc gouging

Highlights

PowerConnect Technology: Automatically connects to any input voltage 200-600VAC, 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

8.5 ft (2.6m) input power cord
Flextec® 350X PowerConnect® (Tweco) | K4273-2
Weld Cable Package - Work & Power Lead 2/0 - Tweco® Male & GC500 / Tweco® Male & Lug - 10 ft (3 m) | K1803-2
Drive Roll Kit .035, .045 (0.9, 1.2 mm) Solid Wire | KP1505-1
Control Cable Extension - Male 14 pin to Female 14 pin - 10 ft (3 m) | K1797-10
Magnum® PRO Curve™ HDE™ 250 Welding Guns | K4531-2-10-45
LF-74 Wire Feeder, Bench Model, Heavy Duty | K2426-5
Model 355-2Ar-58010 Flowmeter Regulator Shielding Gas Kit | 3100211

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

Lincoln Electric Flextec 350X PowerConnect Multi-Process Welder, (Tweco)/LF-74 HD One-Pak #K5803-1 - What's Included

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 1-844-682-0205 for assistance.

Browse All Welders for sale at the best prices online, from Welders Supply.

This product replaces these legacy models:

Flextec® 350X PowerConnect® / LF-74 One-Pak® #K4274-6

General Specification

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)
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

Machine Technologies & Connections

Output Range by Mode	5-425A
Machines Communication Technology	analog digital CrossLinc ArcLink
Wire Feeder Supply Voltage	40VDC
Amphenol Pins (type of connector)	5 12 14
Work Lead Connector Type	Tweco