if oyur mounting the unistrut to the ceiling, purchase the brackets and just bolt it all up, no welding required. its designed to be bolted together not welded ..
I used a piece of inch and a half angel 20 inches long, studs were 18ins center
lag bolted to ceiling. then 1in. strap metal bolted to angle, put the strap in vise twisted a quarter turn punched the holes and mounted. didnt need a cross brace it was pretty stout.
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