copper to aluminum

bfullmer · Aug 12, 2015

Working on a freezer today-it had a copper tube hooked to a alum tube evaporater--what tool or process is used to do this?

Texasmark1 · Aug 12, 2015

A crimp connector of a material that is in the same group. Mil-Std-454 puts Stainless in the alum group (I for alloys and II for the bare metal) and copper group (IV). A footnote mentions that SS can be used with any metal in groups II,III, and IV) Answer, a SS crimp.

However the power company connects their alum service entrance wire to my copper service feed with a crimp connector and it looks more like zinc or alum. Their crimp may be treated like you had to treat alum wires when you used that material for house wiring. Don't remember the substance but it was thick and blue black in color.

guido · Aug 12, 2015

Hello fuller,

Amana years back was sourcing out the copper to aluminum connection. They were not able to make it stick! A friend of mine was making that connections transition. The aluminum and copper pieces were friction welded. I have one of those pieces in my tool box. I did a tool challenge on the think awhile back,

Guido.

Bob · Aug 13, 2015

Epoxy?

Texasmark1 · Aug 13, 2015

(quoted from post at 04:14:12 08/13/15) Hello fuller,

I did a tool challenge on the think awhile back,

Guido.

Got my curiosity up. What is a tool challenge? Got mad at it and beat the begeebies out of it because it wouldn't do what you wanted?

guido · Aug 13, 2015

Hello bfullmer,

I found a picture of the tubes, about 1/2 in. O.D. and 1/4 in. I.D. Here they are,

Guido.

bfullmer · Aug 13, 2015

to Guido back when I went for company refrigeration training they did not know how is was done , they bought it already done from another vendor- Is this some big trade secret ??

JMOR · Aug 13, 2015

Your answer was just on the show "HOW it is Made" on the Science Channel. Video & explanation on the Trane factory assembly line. A zinc-aluminum alloy "transition tube" (half length has Zinc-al alloy treatment & other half copper) is soldered to the aluminum tube (No additional stick solder was used at aluminum/transition tube end, just heat to fuse the two together.), then the copper manifold is silver soldered (Sil-fos ?) to the copper end of the transition tube. Transition tube looked like the one pictures in this thread.

guido · Aug 14, 2015

Hello bfullmer,

It probably was. My friend's father worked for SKF in the bearing room, as he called it His father worked there during the war. He worked there as well as a machinist.

Guido.

copper to aluminum

bfullmer

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guido

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Bob

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bfullmer

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