This is critical. Do not let the base metal get above 350°F (175°C). Use a temp stick. If the metal is too hot to touch for more than 4 seconds, stop and let it cool. Overheating destroys the corrosion resistance of the 309 deposit.
Diagnostics: monitor vibration, winding resistance, insulation resistance, phase currents, and temperature. gdp e309 hot
First, a brief metallurgy lesson. E309 is a chromium-nickel alloy electrode used to weld stainless steel to mild steel, or to repair manganese steel castings. The "hot" designation implies a higher iron powder content and a higher deposition rate. You use it when tolerances are zero, temperatures are extreme (think exhaust systems, furnace parts, or cryogenics), and failure is not an option. This is critical
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