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ManualsBrandsEverlast ManualsMulti Process Welders250 Amp LightningMTS 275 IGBT Digital Inverter AC-DC MIG/TIG/Stick Multi-Process Welder, HF/Lift TIG Start, 240-Volt
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TERMS RELATED TO DC TIG FUNCTIONS
Pre-Flow Time. Pre-flow time is the amount of time that the shielding gas flows before the start of the weld. This is used to help
provide clean arc starts and prevent oxidation of the weld metal by forming a pocket of shielding gas around the weld area before
the arc starts. It also preserves the point on the Tungsten. Typical Pre-Flow times range from .5 to 1.5 seconds.
Pulse. The Pulse on this unit features both standard pulse and advanced AC pulse. Standard pulse can be used in both AC and
DC modes. (Aluminum, Stainless, and Steel). Advanced AC pulse is for welding aluminum only and is only available in AC mode.
Pulse is simply the cycling of the AC or DC current between a high amp value and a low amp value. Pulse frequency (Hz) con-
trols the number of times this happens per second. Pulse Time-On controls how much relative time the pulse lingers in the high
amp stage or the low amp stage of the pulse.
Standard Pulse is used to for several purposes:
1. To control heat. The pulse is used to help constrict the arc to prevent spreading of heat
2. To direct the arc. The conning action on the arc that the pulse improves directabilty of the arc when corner joints or tight
places are being welded.
3. To improve appearance. The pulse can be slowed to provide, smooth, evenly spaced ripples in the weld, often referred to as
the “stack of dimes” appearance. While it also helps to control heat in this mode, the effect is primarily for aesthetics.
See more information on pulse later in this manual.
Start Amps. The Start Amp function sets a beginning Amp setting that the arc starts with. This can be set low for thin materials, or
high for thick aluminum which requires a heavy “punch” of Amps to develop a weld puddle. This can be used with either the foot
pedal or the torch switch functions. For pedal use, however, set Start Amps at the minimum setting unless arc starting is difcult
due to a large tungsten, or poorly prepped weld surface.
Section 2 Setup Guide
UNDERSTANDING DC TIG FUNCTIONS