Even the best electrode will fail if handled incorrectly. Follow these guidelines for optimal performance.
Problem: Weld cracking along the toe of the weld.
Cause: Too much dilution from the carbon steel base metal.
Solution: Use a "buttering" technique. Run a thin layer of E309 on the carbon steel edge first, let it cool, then weld the stainless steel to the buttered layer. gdp e309
Problem: "Wagon tracks" or slag inclusions.
Cause: Insufficient interpass cleaning.
Solution: E309 produces a heavy, glassy slag. Use a wire brush or grinder after every pass. Even the best electrode will fail if handled incorrectly
Problem: Spatter sticking to the stainless steel side.
Cause: Amperage too high or arc blow.
Solution: Reduce amperage by 10-15%. Switch to AC if arc blow persists on DC. Cause: Too much dilution from the carbon steel base metal
Why would a welder reach for a GDP E309 rod instead of a standard 308L? The answer lies in dilution tolerance.
To achieve optimal results with a 1/8" (3.2mm) GDP E309 rod, follow these typical parameters: