Welding professor lineage at MIT (Masubuchi)

Tom's predecessor in welding at MIT. Reference is to a colleague who started one of the first electron-beam job shops in New England. ## Cases referenced from prior sessions The opening of §1 continues a discussion from the previous session about Seabrook weld-metal cracks and the limits of ultrasonic inspection in coarse-grained weld metal. No new content introduced; treated as continuation, not a fresh case. ## Open questions - §4.p4 referenced colleague: name not recoverable from transcript; if other lectures identify the MIT-era EB-shop founder, this is the cross-reference. - §7.p5: USS Patrick Henry treatment in transcript suggests Tom saw the photo personally; cross-reference with other submarine-hull lectures may identify the photo source.

They could make this electron beam weld. This is about a half-inch-thick material; I don't know what part of the reactor it was, all I got was test samples. There are two electron beam welders in eastern Massachusetts — a lot of electron beam welding shops in New England compared to other parts of the country. The first electron beam welder was at Pratt & Whitney in Connecticut, a General Electric plant, for the aerospace industry. A bunch of European companies came over, those experts in electron beam came over into Connecticut and Massachusetts, and they're still here. One of the earliest ones was started by — one of my welding professors at MIT, Koichi Masubuchi knew him — back in the 60s, started electron beam on a job-shop basis as a consulting business.