Bob,
Since no one else has had the opportunity to chime in, how about a modified
approach - if you have the room on the board.
Take short lengths of the nickel battery terminal strips and pre-wet approx
1/2 the length, using whatever aggressive [WS] flux you desire, in your
solder alloy/pot of choice. Toss them into a beaker and clean. Solder the
pre-tinned end to your board.
Either have the contact strips lay flat on the board surface, or have them
formed at a 90 degree angle, whichever best suits the application. Not sure
if your welder will work in a 'pinching' type application, or it is only set
up for a parallel 'spot' config.
Wouldn't ENIG work out okay for soldering the wires and contact strips to
the PWB? If you soldered the pre-wetted contact strips couldn't you just go
back to 'normal' 1 oz foil - assuming you have negligible currents involved.
Alternatively, can the wires be welded to the battery strips directly,
without the PWB?
Can you do the inverse - take the pre-wetted contact strips and spot weld
them to the battery strips, leaving the solder surface exposed, and then
solder the wires to them? Possibly make the pre-tinned end of the battery
terminal strip part of the 'normal' battery interconnect assembly instead of
a separate piece, such that after all the battery interconnects are done,
you have a 'tinned' piece/area left over for wire attachment?
I will crawl back under my rock now :-)
Best wishes
Steve Creswick
Sr Associate - Balanced Enterprise Solutions
http://www.linkedin.com/in/stevencreswick
616 834 1883
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Friday, September 09, 2011 3:14 PM
To: [log in to unmask]
Subject: [TN] Suggested Finish for Welding Nickel to PCB
Hi,
I make some battery packs where the cells are connected by spot welding 3mil
nickel strips to the cells. I also have some wiring that needs connecting
and I was considering the use of a small PCB.
The idea is to spot weld nickel strips from the required battery terminals
to the PCB. I could solder but the nickel strips can be difficult to solder
and spot welded connections are easy, fast and reliable.
My question is: What is the best finish for the PCB to support the spot
welding of the nickel strips AND for attaching soldered wires?
I would guess a Nickel finish though I don't know how thick.
I am using a Sun Stone Dual Pulse spot welder and I know it can, and will,
blast away a spot of copper foil if the current is set too high. I will
probably need a minimum of 2oz copper to support the spot welding.
Any ideas or suggestion on thickness or materials?
Thanks,
Bob K.
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|