Using DCEP when welding with GTAW is usually limited to which types of metals?

Using DCEP when welding with GTAW is usually limited to which types of metals?

• A. Stainless Metals
• B. Mild steel metals
• C. Chromium metals
• D. Refractory metals

Answer: (D)

Direct current electrode positive delivers more heat into the workpiece than electrode negative, so choosing DCEP increases heat input at the weld. Metals with very high melting points—refractory metals like tungsten, molybdenum, niobium, and tantalum—need that extra heat to reach fusion and form a sound weld. For most other metals welded with GTAW, DCEP would put in too much heat or cause other drawbacks (like faster tungsten wear or poor control), so it’s typically limited to refractory metals.

Direct current electrode positive delivers more heat into the workpiece than electrode negative, so choosing DCEP increases heat input at the weld. Metals with very high melting points—refractory metals like tungsten, molybdenum, niobium, and tantalum—need that extra heat to reach fusion and form a sound weld. For most other metals welded with GTAW, DCEP would put in too much heat or cause other drawbacks (like faster tungsten wear or poor control), so it’s typically limited to refractory metals.