ADVANCED PROCESS WELDERS ® Power Wave STT Module Input Power 40V DC Processes GMAW-STT® Rated Output Capacity(1) 100% Duty Cycle: 450A 60% Duty Cycle: 500A 40% Duty Cycle: 550A Peak (Max.): 750A Product Number K2902-1 US / International Model K2921-1 CE Model See back for complete specs Power Wave® STT® Module Weight/Dimensions (H x W x D) 47 lbs. (21.3 kg) 11.5 x 13.9 x 25.4 in. 292 x 353 x 645 mm (1) Dependent on host welding power source output Add STT® (Surface Tension Transfer®) process capability to any compatible Power Wave® S-Series power source to gain outstanding puddle control for critical sheet metal or pipe root pass welding. The compact STT® module seamlessly integrates with the power source using the high speed Lincoln Electric ArcLink® digital communications protocol. Sheet Metal Fabrication Root Pass pipe welding K2921-1 CE Model K2902-1 US/International Model WHAT’S INCLUDED K2902-1 Includes: Power Source Output Pigtail Adapter Cable (Tweco-style) Remote Voltage Sense Lead - 25 ft. ® K2921-1 Includes: Sync Tandem/STT® Receptacle ArcLink® Receptacle Sense Lead Exceptional Arc Control - Outstanding burnthrough control on thin metal or critical pipe welding. Ultimarc™ - In synergic STT® modes, it dynamically and simultaneously controls all heat input parameters together, including peak, background and tailout currents. The result is easy procedural setting for the operator. Modular Design - The module allows easy connection and fast digital communication with compatible S-Series Power Wave® power sources, Power Feed™ wire feeders, and compatible water coolers. Add STT® capability without having to purchase a second power source. Compact Footprint - The module is designed to securely connect directly below Lincoln S-Series Power Wave® models, without taking valuable floor space. Self-Protecting Circuits - The module will protect itself from the excessive transient voltages associated with highly inductive weld circuits. Two Year Extended Warranty Available In the U.S.A. and Canada IP23S ISO 9001:2000 14001:2004 THE LINCOLN ELECTRIC COMPANY Publication E5.190 | Issue Date 5/10 © Lincoln Global, Inc. All Rights Reserved. 22801 St. Clair Avenue • Cleveland, OH • 44117-1199 • U.S.A. PH: +1.216-481-8100 • www.lincolnelectric.com

WHAT IS STT ® (SURFACE TENSION TRANSFER®)? STT® (Surface Tension Transfer®) is a controlled GMAW short circuit transfer process that uses current controls to adjust the heat independent of wire feed speed, resulting in superior arc performance, good penetration, low heat input control, and reduced spatter and fumes. For more information see Nextweld® Document NX-2.20 STT® using CO2 and .045 in. solid wire. Note reduced spatter and fume. Conventional CV short circuit transfer using CO2 and .045 in. solid wire. A. STT® produces a uniform molten ball and maintains it until the “ball” shorts to the...

APPLICATION DETAILS Using STT® for Open Root welding Open root welding is used for pipe and single-sided plate welding in situations that preclude welding from both sides of the material. This type of welding is common in the petrochemical and process piping industries. Open Root Pass with Stick Electrode Advantages of STT® Open Root • Penetration Control - Provides reliable root pass and complete back bead. Ensures excellent sidewall fusion. Stick welding with cellulose electrodes provides good fusion characteristics, but leaves deep wagon tracks (requiring more labor for grinding), a very convex...

SETTING STT® PARAMETERS Power Feed™ 10M Wire Feeder Non-Synergic Interface Control 1. Adjust WIRE FEED SPEED to: - Control the deposition rate 2. Adjust PEAK CURRENT to - Control the arc length Adjust BACKGROUND CURRENT to: - Control heat input (fine) Adjust TAILOUT to: - Control heat input (coarse) Adjust HOT START to: - Control the heat input at the start of the weld. 3. Adjust START / END OPTIONS to: - Modify PREFLOW time, RUN-IN WIRE FEED SPEED and START time as well as CRATER, BURNBACK and POSTFLOW time. Power Feed™ 10M Wire Feeder Synergic Interface Control 1. Adjust WIRE FEED SPEED to:...