Check the amount of gold in your pins first you may have more gold than you
can properly dissolve in the paste you are putting on your PWA. The grainy
look may com from a slow cool down based on your thick holder info. Look at
your total gold content first you may be dealing with possible gold
embrittlement.
Good luck

Hector Valladares
Honeywell -SASSO
Production Staff Engineer
727.539.3683 voice
727.539.4469 Fax
[log in to unmask]



-----Original Message-----
From: Luis Alcantra [mailto:[log in to unmask]]
Sent: Wednesday, March 22, 2000 11:56 AM
To: [log in to unmask]
Subject: [TN] ?BEST PROFILE FOR GOLD PLATED PINS


Hi every one:
             We are currently experiencing some dificulties soldering gold
plated pins, they go on a 1/2 of an inch square pcb w/a cap an a resistor.
we had tried several profiles with no satisfactory results, we are using
kester #Sn63Pb37 solder on a Vitronics 722 20 zone reflow oven as follows:
165-175-250-  -260-260-260-260-260-280-400 degrees temp. it may seen to
high but our pcb fixture is thick an pcb bar holders on each side.

The problem is solder looks GRAINNY/COLD any suggestions for a good solder
paste/profile?

regards.

LUIS ALCANTARA
ENGINEERING DEPT.
[log in to unmask]
(623) 516-3700

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