Any good PDR shop can make quick work of those dents.
All of us have the dents. Some are more visible than others. I didn't notice mine until I saw another post asking about the dents.
The dents are actually a result of a manufacturing process called resistance spot-welding. It's a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current. You can demonstrate this denting phenomenon by placing a drop of glue in the center of a piece of paper then place another sheet of paper on top of the sheet with the glue drop - let dry then gently pull the sheets apart and notice the dent.
You might have seen a TV video showing an auto manufacturing line with robots clamping down on a car body and sparks flying - that's resistance spot-welding in motion.
In the show room the dents are probably not visible but after a few miles, sun, heating, cooling, the metals joined by the spot-weld tend to move leaving the dent like the "paper dent." It's probably more an esthetics problem rather than a manufacturing defect.
2008 CX9 GT 160,216 miles (retired).
2015 CX9 GT Mica Blue, NAV, RSES DVD package, goodies.
I went ahead and watched the CX5 Assembly video again on youtube. Thought maybe I could see if there was a place during the construction process that I could pick up on it, but I could not see one myself.
here is the assembly plant video, fun to watch...
Mazda's I have owned over the years.
80' Mazda GLC SPORT MT - sold
81' Mazda 626 DX MT - sold
81' Mazda 626 LX AT - sold
82' Mazda 626 DX MT - sold
82' Mazda 626 LX AT - sold
85' Mazda 626 LX MT - sold
87' Mazda 626 GT Turbo MT - sold
85' Mazda RX-7 GSL-SE MT- sold
87' Mazda RX-7 Turbo 2 MT - sold
91' Mazda Protege LX MT - sold
92' Mazda MX-5 Miata MT - sold
93' Mazda MX-3 GS-V6 Special Edition MT - sold
00' Mazda 626 LX-V6 MT - sold
02.5' Mazda Protege5 MT - sold
92' Mazda MX-5 Miata MT - sold
06' Mazda 5 Touring AT - sold
13' Mazda CX-5 Touring AT - sold
14' Mazda 3i Grand Touring MT - sold
15' Mazda CX-5 Touring AWD AT - sold
03' Mazda Protege5 AT - sold
16.5' Mazda CX-5 Touring AWD AT - current
09' Mazda Mazdaspeed3 GT - current
In your video the spot-welding occurs about 4:10. You can see a few sparks fly at 4:30 and 4:41. The robots seems to move along the roof every 6-10 inches or so to spot-weld.
Check this vid http://www.bing.com/videos/search?q=...93&FORM=VRDGAR
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Firstly, if these tiny dents which appear to the same roof rail area above the rear doors are caused by spot-weld, from my past experience seeing the assembly line those spot-weld points need special treatment if they're on the visible part of sheet metal for cosmetic reason. They're to be smoothed out even with filler if necessary.
Secondly, there're many spot-weld points have to be done to the visible part of sheet metal such as any connection point between two body panels. So why we don't see these tiny dents in other areas such as the roof rail area above the front doors, top of the A、B、and D pillars?
I also believe these tiny dents are caused by spot-weld but it seems Mazda overlooked this particular area for special treatment, or they think these dents are acceptable with their esthetic standard.
can't find those dents on mine - hope it's not because the roof rails are blocking them from sight...
no dents on mine that I could see/feel.