In DC+ mode, what proportion of heat is delivered to the tungsten?

In DC+ mode, the electric arc generated in Gas Tungsten Arc Welding (GTAW) primarily transfers about 70% of the generated heat to the tungsten electrode. This mode of operation utilizes direct current with the electrode being positively charged.

The characteristics of the arc welding process in this mode result in a more concentrated heat production at the tungsten electrode compared to the workpiece, allowing for effective control over the welding process. The high proportion of heat directed to the tungsten allows it to reach the required temperatures for melting and maintaining the arc effectively, which enhances the overall stability and performance of the welding process.

Understanding this heat distribution is crucial for welders as it influences factors such as penetration, bead shape, and overall weld quality. Knowledge of these dynamics helps in selecting the appropriate welding parameters and in troubleshooting any issues that may arise during the welding operation.