Variations-
Metal
Transfer
Introduction
Equipment
Description
Short Arc
Welding
Power
Supply
Shielding
Gases
Globular
Transfer
Spray Arc
Welding
Cored Wire
Welding
Wire
Electrodes
Safety
Welding
Techniques
Welding
Conditions
Economics
Weld
Defects
Mig Spot
Welding
Tables

 

3 Process Variations-Metal Transfer The basic mig process includes three distinctive process techniques: short circuiting metal transfer, globular transfer, and spray arc. These techniques describe the manner in which metal is transferred from the wire to the weld pool. In short circuiting metal transfer, also known as ”Short Arc”, ”Dip Transfer”, and ”Microwire”, metal transfer occurs when an electrical short circuit is established. This occurs as the molten metal at the end of the wire touches the molten weld pool. In spray arc welding, small molten drops of metal are detached from the tip of the wire and projected by electromagnetic forces towards the weld pool. Globular transfer occurs when the drops of metal are quite large and move toward the weld pool under the influence of gravity. Factors that determine the manner of metal transfer are the welding current, wire size, arc length (voltage), power supply characteristics, and shielding gas.
Figure 1-1 – Types of Metal Transfer