Technically they are supposed to but many pawn it off on their hrtm. I have grown to like doing them. It's a great way to build rapport with the team and be seen as a go-to person for help.
My ETL HR runs a crappy orientation. She's not particularly friendly and doesn't really care about setting new tms up for success. She is more the type to hire a bunch of folks then weed out the ones who don't swim.