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Tom Wesenberg · 12-21-2013, 08:45 PM

Yes, they were electrically welded around the blade edge. That's why water from a leaking water pump would get trapped in the blades and rust them from inside out. This is easy to detect by bulges in the blades. I'm still running an original fan and it has a very slight bulge.

12-21-2013, 08:45 PM	#4
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Double thickness fan construction Yes, they were electrically welded around the blade edge. That's why water from a leaking water pump would get trapped in the blades and rust them from inside out. This is easy to detect by bulges in the blades. I'm still running an original fan and it has a very slight bulge.