| Electrode Diameter | Current (DC+) | Amperage Range | | :--- | :--- | :--- | | 1/8" (3.2 mm) | DC+ or AC | 80-120 A | | 5/32" (4.0 mm) | DC+ or AC | 110-150 A | | 3/16" (5.0 mm) | DC+ or AC | 140-180 A | Use a short arc length (approximately the diameter of the core wire). A long arc with E309 introduces porosity and alloy burn-off. Chapter 6: GDP E309 vs. The Competition Why do professionals type "GDP E309 best" instead of choosing Lincoln Electric, ESAB, or Harris? Let's compare.
Purchase a small 10 lb canister of GDP E309 today. Run it on a practice test plate (carbon steel to 304 stainless). Compare it to your current brand. The difference in arc start, slag release, and bead profile will confirm why so many professionals search for—and insist on—the GDP E309 best. Disclaimer: Always follow your welding procedure specification (WPS). This article is for informational purposes. GDP is a trademark of its respective owner. Always consult the manufacturer’s datasheet for exact specifications. gdp e309 best
High dilution from the carbon steel (up to 35%) was creating a brittle layer. | Electrode Diameter | Current (DC+) | Amperage