On 4/26/2014 1:00 PM, Warren Wolff via TowerTalk wrote:
My Tower guy wants to CadWeld my copper to the
legs of my AN Wireless tower. This worries me.
I'd pass on CadWelding directly to tower legs. CadWelding melts a goof
portion of the base metal and alloys it with the copper and the Aluminum
in the CadWeldinf material. It makes a very good electrical joint, but
would severely weeked the portion to the legs that is melted. It also
heats quie ab=n area areound the weld to red hot, which slowly cools.
I don't know the temper of the legs, but any present temper is likely
reduced. I would neither heat the legs to a temper reducing dull red,
or hotter, nor would I allow holes to be drilled the the legs and
particularly no holes in galvanizing. ROHN specifically warns against
drilling out tight fitting bolt holes, or using the bolt to thread its
way in. To enlarge the holes, use a long taper pin with a gradual taper.
This will open the hole enough to allow "sliding" the bolt in and leaves
the galvanizing in tact! You may have to drive the taper pin in from
both directions.
As a general rule, for tower legs, don't heat, don't weld, and don't drill.
73
Roger (K8RI)
Warren
W7WY
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