Final answer:
The type of current that allows an electrode to carry higher current without overheating in GTAW is DCEN/DCSP, as it generates more heat on the workpiece and less on the electrode, maintaining a cooler electrode.
Step-by-step explanation:
The type of current that allows an electrode to carry significantly higher current without overheating in Gas Tungsten Arc Welding (GTAW) is Direct Current Electrode Negative (DCEN), also known as Direct Current Straight Polarity (DCSP). In DCEN/DCSP, the electrode is the negative pole and the workpiece is the positive pole. This configuration results in less heat being generated at the electrode and more on the workpiece, which allows the electrode to carry a higher current without overheating. This is due to the fact that with DCEN/DCSP, approximately 2/3 of the heat is concentrated on the workpiece while only 1/3 is generated at the electrode. Consequently, this maintains a cooler electrode and provides better control of the electrode tip.