Latest / Deep End Era. Engineering with Sankalp
The Crack That Waited: Welding Metallurgy
Two days after passing every inspection, a thick-walled pipe spool at a fictional offshore fabrication yard shows a crack beside the weld. Senior inspector Ikenna Obi tells his apprentice engineer Saoirse Kavanagh what caused it in one word: hydrogen. In episode one hundred and seventy three we treat every weld as a tiny casting and an accidental heat treatment. We follow steel through austenite and martensite, learn why carbon equivalent and preheat matter, and see how hydrogen, a hard microstructure and stress line up to crack a weld hours later. We cover sour service, duplex steels…
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