Introduction And Description; Description - Thermal Arc ARCMASTER 300 MST Operating Manual

2.0 INTRODUCTION AND DESCRIPTION

2.01 Description

The Thermal Arc™ ARC MASTER 300 MST is a single & three-phase DC arc welding power source with Constant
Current (CC) and Constant Voltage (CV) output characteristics. This unit is equipped with a Digital Volt/Amperage, lift
arc starter for use with Gas Tungsten Arc Welding (GTAW), Arc Control and Hot Start for Shielded Metal Arc Welding
(SMAW), Inductance Control for Gas Metal Arc Welding (GMAW) processes. The power source is totally enclosed in
an impact resistant, flame resistant and non-conductive plastic case.
(V)
OCV
18V
5A
STICK Process
(V)
OCV
10V
25A
LIFT-TIG Process
Volt-Ampere curves show the maximum Voltage and Amperage output capabilities of the welding
power source. Curves of other settings will fall between the curves shown.
160A
300A 320A
300A (A)
Figure 1. Model 300 MST Volt-Ampere Curve
(V)
OCV
29V
10V
5A
MIG Process
Note 1
10
300A 320A (A)