Material-Specific Applications The material being welded is the primary factor in determining the correct current type. Workpiece Heating: The concentrated heat on the metal allows for deep, narrow penetration, ideal for butt joints and thick sections.
Understanding DCEN Phase Heat Transfer and Puddle Melting Behavior
While modern inverters offer flexibility, the fundamental physics of the arc remain unchanged, dictating metal behavior, penetration, and overall weld quality. Direct Current (DC) provides a consistent, linear path for electrons, resulting in a stable arc with predictable heat distribution.
Conversely, aluminum requires AC. Direct Current Electrode Negative (DCEN) Penetration and Cleaning Action DCEN is the most common mode for standard TIG welding of steel and stainless steel.
Understanding DCEN Phase Heat Transfer and Puddle Melting
On aluminum, the surface oxide layer melts at a higher temperature than the base metal, leading to contamination and porosity. Alternating Current (AC), however, alternates direction 120 times per second in a 60 Hz system, creating a unique dynamic that is indispensable for specific applications.
More About Ac or dc tig welding
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