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If you go back a couple hours in the linked live feed you can find the event pretty easily. Look for the big plume in the preview when you hover over the progress bar. About 1:50 ago at this working writing. I guess it would have been around 1540 EST.

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Looks like the welds holding the bulkhead on failed.

For those who aren't keeping up with this the failure was on the Mk1 prototype. Mk2 has been build nearly in parallel with Mk1 and will take over early flight testing (20km hop). Elon has tweeted that this team will jump to Mk3 instead of trying to repair Mk1.

Airliners rarely use welds because they're very hard to make with consistent high quality and are also very hard to inspect. Instead, they're riveted together.

There are airplanes constructed with chemical bonding as well, such as the Boeing 787 Dreamliner and my personal favorite, the AA-1, released in 1967! Welded airplanes are practically nonexistent, but there are techniques other than riveting. And with the rise in popularity of composite materials, we're likely to see fewer and fewer rivets on airplanes.

Friction stir welding is popular in rocketry because it is very controllable.

Is the mk2 in the parallel location?

Yes, SpaceX is currently building Mk2 in Cocoa, Florida.

Here's an aerial video from beginning of october: https://www.youtube.com/watch?v=ChXMhSmqYqs

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