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Looking at those welds on the right side support bar it looks like the welder did the on/off on/off of the trigger overlapping spot welds instead of a vertical up weld. Almost no HAZ indication next to the weld.
I hope he didn't use this method on the rear supports at the hoop. 
Its called stitch welding.... works fine
Yes, it is called "stitch welding" and in this application it does not "work fine". It should have a proper 'stringer' weld. Stitch weld your new quarter panels, not a roll bar.
Here's some more on the subject....
http://www.millerwelds.com/resources/communities/mboard/archive/index.php/t-5923.html
Maybe some certified welders will jump in here also.
I took a look at the pic you guys are referring to..
IMO that is a very bad weld and not safe. But it's not the reason you guys are talking about.
I'll explain, If you look at the weld closely the arcs point up not down (I hope this makes sense to you guys). If the arcs point up that means the welder made the number one mistake, unless of course the car was upside down when he welded it.
What I am saying is he did a vertical down weld which is never acceptable on any critical or structural weld. Vert down weld are only good for sheetmetal, tacs, or other non critical areas. But still you should never pactice or get used to this method.
Just my
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