Welding with cooling to room temperature after each pass induces aging of the lower layers of the weld seam, which substantially lowers the toughness of the weld seam.
Welding without cooling below 200–220°C after each pass prevents aging of the weld metal and ensures consistent values of the mechanical properties and higher toughness of the weld seam.
Quenching after welding eliminates aging, equalizes the structure of the weld seam, and increases the toughness.
Aging lowers the toughness of the weld seam. In this case embrittlement of the seam is evident following welding without cooling after each pass, which is due to the coarser dendritic structure of the weld seam.
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Shtrikman, M.M., Kapranova, I.P. & Romanova, E.T. Structure and properties of welds in maraging steel N18K9M5T. Met Sci Heat Treat 14, 853–856 (1972). https://doi.org/10.1007/BF00648079
- Mechanical Property
- Weld Metal
- Lower Layer
- Dendritic Structure