Werner,
Very nice, thank you. I did work with two gentleman, whose names escape me, from Bell Labs here in Andover, MA that used Hot Bar method.
I have been fortunate to be a student in several of your classes over the years and had a wonderful time; specifically solder joint reliability (intermittent open with high G force comes to mind) and of course small hole reliability. Good times. Thank you Sir.
Brad
----- Original Message -----
From: Werner Engelmaier<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Tuesday, July 13, 2010 3:52 PM
Subject: Re: [TN] SFF-8087 PCB (Also call Min SAS)---Really need you help
Hi Brad,
A really useful working 'hot bar' was developed at Bell Labs, was successfully used internally, but never was commercialized.
Here are the references,
Engelmaier, W.,“Transverse Joulean Heated Soldering Tool for Mass Terminations,” Proc.NEPCON/West, Anaheim, CA, February 1979, pp. 228-235.
Engelmaier, W.,“Transverse Joulean Heated Double-Sided Reflow Soldering Machine for MassTerminations,” Proc. NEPCON/West, Anaheim, CA, February 1981, pp. 333-339.
Engelmaier, W., andHans H. Ammann “Laminated Electric Heat Generating Member for Reflow SolderingDevices,” U.S. Patent 4,412,123, October 25, 1983..
Werner
-----Original Message-----
From: Brad Saunders <[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Tue, Jul 13, 2010 3:43 pm
Subject: Re: [TN] SFF-8087 PCB (Also call Min SAS)---Really need you help
In my experience, including the "way back machine" Hot Bar soldering was never
so hot and compelled me to spend more time in the bar...
With the risk of failure, reliability less than 100%, and potential scraping of
full value modules I always went with a small/mini/nano connector solution.
Although I do know there are folks out there successful in Hot Bar usage. ["way
back" being from 1985-1990, when all kinds of things were going on in PCB land
and CTE became a household name...]
Brad
----- Original Message -----
From: Tony Liu<mailto:[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]:[log in to unmask]>>
Sent: Thursday, July 08, 2010 10:49 AM
Subject: [TN] SFF-8087 PCB (Also call Min SAS)---Really need you help
Hi,
I need you help,appreciate you if you can give some useful suggestion
Now a product that called Mini SAS is making in my compay,it is a cable
assembly, consist by two PCB ,36 way wires,heat shrink
tubing,innermold,overmold,etc.The wire diagram is one to one,two ends are
36PIN PCB.
The PCB is 36 PIN(18PIN in each surface) and the pitch between each pad are
very small, PCB pad width is 0.6mm and the pitch is 0.8mm,the operator weld
the conduct of wires to PCB pad by HOT-BAR(auto welding maching),
the key problem is after welding and testing there have many badness goods
be made,like as short,open,insulation resistance is very small between each
pin(<1M Ohm),just low than 70% goods could be passed test.
Pls give your prefessional advice how to solve this problem,for instance
PCB designing improve?
Sn component imrpove?
Welding machine parameter?
http://www.google.com.hk/images?hl=zh-CN&q=MINI%20SAS%20PCB&um=1&ie=UTF-8&so<http://www.google.com.hk/images?hl=zh-CN&q=MINI%20SAS%20PCB&um=1&ie=UTF-8&so<http://www.google.com.hk/images?hl=zh-CN&q=MINI%20SAS%20PCB&um=1&ie=UTF-8&so<http://www.google.com.hk/images?hl=zh-CN&q=MINI%20SAS%20PCB&um=1&ie=UTF-8&so>>
urce=og&sa=N&tab=wi
(This web link to MINI SAS 36PIN products,FYI)
Thank you!
Tony Liu
Sales Department
Mobile:13048936174
18926869763
Tel： 0769-22810730
Fax：0769-22810732
Email:[log in to unmask]
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