Key points of Inconel 800 steel welding process

Pre-welding Treatment: Before welding Inconel 800 steel, thoroughly clean the bevel and welding wire surface to remove oil and oxides. Use stainless steel-specific tools to avoid carbon steel contamination. The welding rods must be dried, and the ambient temperature should be ≥10℃ to reduce preheating requirements.

Inconel 800 Steel Welding Parameter Control: TIG welding with SMAW (Granite-Tungsten Arc Welding) is recommended, using low current and low heat input (interpass temperature ≤150℃). Argon purging is required on the back side, and the gas should be shut off 10-20 seconds after welding until the weld cools.

Inconel 800 Steel Post-weld Heat Treatment: Heat treatment is usually not required, but grade 800H requires holding at 899℃ for 2 hours (for a thickness of 25mm) to eliminate the risk of stress relaxation cracking. Natural air cooling or furnace cooling is recommended.