In GTAW, which polarity has electrons flowing from the tungsten to the workpiece?

In GTAW, which polarity has electrons flowing from the tungsten to the workpiece?

• A. AC
• B. DC+
• C. DC-
• D. Reverse polarity

Answer: (C)

In Gas Tungsten Arc Welding (GTAW), known as TIG welding, the polarity that has electrons flowing from the tungsten electrode to the workpiece is direct current negative (DC-). This polarity establishes a strong arc and allows for effective arc control and heat concentration at the welding site. When using DC- polarity, the tungsten electrode becomes the negative terminal, which means it will emit electrons that travel toward the workpiece. This electron flow promotes better penetration into the material being welded and helps in achieving a clean weld pool, which can be particularly beneficial when welding thicker materials or working in positions that require precise control. Utilizing this polarity is essential in many welding applications because it ensures stability in the arc and can improve the quality of the weld. Other polarities, such as DC+ (where the electrode is positive) and AC, do not facilitate the same flow of electrons from the tungsten to the workpiece, impacting the arc characteristics and heat distribution during the welding process.

In Gas Tungsten Arc Welding (GTAW), known as TIG welding, the polarity that has electrons flowing from the tungsten electrode to the workpiece is direct current negative (DC-). This polarity establishes a strong arc and allows for effective arc control and heat concentration at the welding site.

When using DC- polarity, the tungsten electrode becomes the negative terminal, which means it will emit electrons that travel toward the workpiece. This electron flow promotes better penetration into the material being welded and helps in achieving a clean weld pool, which can be particularly beneficial when welding thicker materials or working in positions that require precise control.

Utilizing this polarity is essential in many welding applications because it ensures stability in the arc and can improve the quality of the weld. Other polarities, such as DC+ (where the electrode is positive) and AC, do not facilitate the same flow of electrons from the tungsten to the workpiece, impacting the arc characteristics and heat distribution during the welding process.