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jjdoodah, The recommendation to use HD galvanized structural bolts with the aluminum connections came from a water systems engineer. The recommendation is based on the mild steel being closer to the aluminum on the MIL-STD-889 galvanic corrosion sequence table than the 300 series stainless...

Hello, I have a structure that requires 18-8 stainless steel bolts and 6061-T6 Al beams and channels to be isolated against galvanic corrosion. I have seen good reports on Tef-Gel ( http://www.tefgel.com)for this purpose, based on marine applications, and in searching the web, also found that...

Here you go... http://www.tefgel.com.au Also, spoke with the man himself. Mr. Morgenthaler. Looks like it will work for either galvanized or SS fasteners in contact with Al, but his recommendation of course went to SS fasteners in Al members. Thanks for the input...

"Tef-Gel" or "something similar" was mentioned in another thread as a means of anti-seizing or anti-galling. I did a web search and found a contact, and put in a call. I hope to be getting more specifics soon. From the Ultra Safety Systems website, at http://www.tefgel.com , I found the contact...

Thanks for the comment. We are currently evaluating SS bolts for this installation. With the SS bolts, will it still be necessary to use an isolation sleeve or washer under SS washer at the bolt head and nut, or would such a product as Tef-Gel sufficiently protect the dissimilar metals? The...

On a typical structural drawing, "HS bolt" would refer to ASTM A325 bolts. I would expect that A490's would be specifically called out as such because of their particular fatigue requirements. As mentioned in the other post, the AISC Steel Construction Manual, 9th edition, would have allowable...

If 6061-T6 must be welded, a compatible filler weld alloy such as 5356 should be used. According to the Aluminum Assoc specs, the 6061-T6 strength will drop from a 24 ksi ultimate shear strength in unwelded state to a 15 ksi ultimate shear strength after welding due to loss of tempering. Since...

Welding two plates to form the angle bracket is what the steel shop manager suggested. On the few (5) 78 degree angle brackets that are needed, I gave them a welding alternate design, using 1/4" 6061-T6 Al plate and 5356 electrodes, with a 3/16" fillet weld on the inside joint of the bracket...

Sorry about the confusion. I will see if I can post a diagram on the web if I cannot clarify it here. I think you have it right. The entire flange is rotated "up" or "down" by 5 degrees by bending along a line parallel to the web and the flange. This would make an "L" shaped angle bracket with...

The part to be bent is a cut section of CS8 channel. Basically, taking a 6" long section of CS8, and cutting off the bottom flange, leaving the top flange and the web connected. Then, hoping to take the top flange and the web and bending the web "inwards" so that the 90 degree angle between the...

Hello, we have a structure that will require some connection brackets to join members that meet at odd angles. There are corner and intermediate joints where the 8" 6061-T6 channels or I-beams meet at 85 degrees, and in one location, 78 degrees. The brackets will be fabricated from excess length...

Hello, It has been recommended to me to use Ultra Safety Systems' Tef-Gel in a connection involving 6061-T6 Aluminum beams and channels and Type 316 stainless bolt assemblies to inhibit galvanic corrosion. However, the original concept involved assembling the aluminum structure with ordinary...

Thanks. We commonly use hot-dip galvanized steel bolts in all our steel structures. In this case, working with aluminum, I assumed we should use the better material in the connectors, and figured on stainless steel. I understand the better match between Zn and Al on the galvanic potential scale...

The aluminum structure will be attached to a supporting steel structure. The steel structure is composed of tubular sections and finished with a Carbozinc coating instead of galvanizing. The connection from the aluminum structure to the steel supports will be made with stainless steel bolts. The...

Hello, I am designing an aluminum structure using 6061-T6 standard I and C shapes which will form a roof canopy, and remain exposed for architectural reasons. The project site is in Los Angeles, and is not located near the coast. However, it will be within a mile or less from 2 heavily traveled...

From the past articles in this thread it seems my question might be answered, but let me put some specifics and see what you corrosion 'gurus' think about this. It's an already built structure, so I need to know if it is worth the trouble to modify it. We are currently reviewing an installation...