Aluminum column bearing on HSS
Aluminum column bearing on HSS
(OP)
Obvious concern is the connection of dissimilar metals. I was thinking the steel tube can have a plate welded to it, and the aluminum post can have a plate welded to it. And the two would be bolted together with stainless steel bolts and there would be a bituminous coating between the aluminum and steel plates to prevent contact. Does this sound reasonable?
The connection is for vertical (including uplift) and some shear loads.
The connection is for vertical (including uplift) and some shear loads.






RE: Aluminum column bearing on HSS
RE: Aluminum column bearing on HSS
RE: Aluminum column bearing on HSS
You still have to insulate the nut and bolt from one or both of the metals!!
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Aluminum column bearing on HSS
RE: Aluminum column bearing on HSS
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Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Aluminum column bearing on HSS
RE: Aluminum column bearing on HSS
RE: Aluminum column bearing on HSS
Michael.
Timing has a lot to do with the outcome of a rain dance.
RE: Aluminum column bearing on HSS
RE: Aluminum column bearing on HSS
It has more to do with the relative size of the members in contact than the electrical connection. Yes, the electrical connection plays a part, but if the area of aluminum is much greater than the area of the stainless steel, then preferential and localized corrosion won't likely occur.
That's why you wouldn't use an aluminum fastener in stainless steel...the corrosion due to the area difference would concentrate in the aluminum fastener.
The most common occurrence in that case is that the aluminum is attacked over its larger surface, resulting in a light passivation layer forming from the oxides. When this occurs, it then protects the aluminum from further corrosion. It can, in fact, reverse the corrosion potential.