#7413. Study of weldability for aluminide Coated Steels through A-TIG welding process

October 2026publication date
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Journal’s subject area:
Mechanical Engineering;
Mechanics of Materials;
Condensed Matter Physics;
Materials Science (all);
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Abstract:
To achieve higher efficiency in high-temperature environments, 9Cr-1Mo steels (also known as P91 steels) are promising candidates in power plants, petrochemical industries, heat exchangers, and nuclear applications. To enhance the performance against harsh environments, such as high-temperature oxidation and corrosion during operations, adding aluminum oxide (Al2O3)/ iron aluminide (FeAl) coating through the aluminizing process has been found promising. Such coatings have been considered reliable for resistance to liquid-metal corrosion against flowing lead-lithium liquid breeders and against tritium permeation in blanket modules of fusion reactors. However, the welding process for aluminized coated steels is a challenge and is scarcely reported. The aluminum-rich coating at the top may alter the metallurgy of weld metal and subsequently the mechanical properties after welding.
Keywords:
Activated-tungsten inert gas welding; Aluminide steel; Depth-to-width ratio; Microhardness; Microstructure

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