At 08:26 PM 11/9/2006, Mel Whitten wrote:
>Cecil,
>
>Not possible, I believe to get a "cold weld" as KISTLER
>web site refers using solid wires. IDC or insertion displacement
>connections is similar to a crimp and here you will see solid
>wires. So now I have seen threads on cad weld, copper weld
>and now we have cold weld. Plastically here I believe, means
>cold flow of the material. Gas tight connection so it won't
>oxidize.
There's all sorts of "deform the metal" sorts of connection
techniques. Crimping being but one.
Wirewrap, for instance, depends on the corners of the square posts
cutting into the wire wrapped around the post to form a gas-tight
seal, with the "stretch" of the wire providing a tension to resist vibration.
3M had a SpeedWire (I think that was the name) where you pushed
insulated solid wire onto fork shaped terminals (much like Insulation
Displacing Connectors from T&B).. the edges of the fork cut into the
wire, forming a gas tight seal and also cutting through any oxide on
the surface.
The ever popular "wire nut" works this way, but sort of in reverse.
The edges of the "spring" inside the nut cut into the solid
conductors. The "spring" keeps the force on in a vibrational environment.
Most all telephone wiring these days is done with crimped connections
of solid wires, with ScotchLok type connectors (or essentially
identical connectors from other mfrs).
The ubiquitous RJ45 network jacks are assembled with the "forked
terminal cutting into the side of the wire" sort of technique, and,
interestingly, provide a constant impedance connection with
remarkably good match.
In fact, now that I think about it, writing the above lines, I
suspect that soldering is sort of an archaic method of connecting
wires, except for some form of mass connection (i.e. flow soldering,
or reflow). And, for, wires at least, "solder isn't structural".
(Soldering is used to attach dice to substrates, but it's not tin/lead solder.)
>I am sure someone on the list can answer your question directly,
>but I am firm believer in crimping when done with the proper
>tools and materials since it can provide a superior connection.
Jim, W6RMK
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|