Bev by Ph I think Jason means phosporus (strictly just P)
Certainly some people have added P in the past to make a low dross solder.
This is really a cosmetic or show room effect which seems to work by
reducing the apparent drossing at the surface of the solder in the pot, not
actually by reducing the inherent dross content if any in the solder. The
effect if any is short lived as the P is quickly oxidised and exhausted out
as the solder is pumped around in the machine. I recall the idea
origininated way back in the early drag solder systems which just used a
static
bath where this sort of effect may have been more useful.
I would like to know if Jason experienced this first hand or is reporting a
third party's experience. And if first hand the actual circumstances. For
example putting a low enough grade solder in a pot will give drossing all on
its own and maybe that was what was seen.
Mike Fenner
BSP, OX15 4JQ, England
T: +44 1295 722 992
M: +44 789 999 7715
F: +44 1295 720 937
-----Original Message-----
From: Bev Christian <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 29 July 1999 14:06
Subject: Re: [TN] Mixing solder bars from different manufacturer's
>Jason,
>I seem to be having some problem understanding what you are trying to say.
>Here are some questions for you.
>
>What is Ph? You aren't confusing this with Pb, the symbol for lead are
you?
>If so, then are you talking about mixing solders of different alloy
>compositions?! This would not be the original situation that Jim put
forth.
>
>
>I would like you to explain to me, chemically, how mixing two solders of
>the same alloy composition with just slightly different purity levels is
>going to cause even more dross than 100% of the more impure one.
>
>What are these low drossing chemical additives you are talking about?
These
>are the materials that are put on top the molten solder in the solder pot,
>right? You are not inferring that suppliers are actually trying to supply
>organic additives in the bar solder are you?
>
>regards,
>Bev Christian
>Nortel Networks
>
>> -----Original Message-----
>> From: Jason Smith [SMTP:[log in to unmask]]
>> Sent: Thursday, July 29, 1999 8:37 AM
>> To: [log in to unmask]
>> Subject: Re: [TN] Mixing solder bars from different manufacturer's
>>
>> When you mix high purity "low drossing" solders that contain Ph with
lower
>> purity solders you will create more dross than with either of the two
when
>> used
>> seperately. I don't see a problem when mixing two lower grades...but the
>> mixture can be catostrophic to a wave solder machine. The nature of the
>> organic
>> low drossing additives pull contaminates out and to the top. I would
just
>> understand my chemistries before mixing them up.
>>
>>
>>
>> [log in to unmask] on 07/28/99 04:51:43 PM
>>
>> Please respond to [log in to unmask]; Please respond
to
>> [log in to unmask]
>>
>> To: [log in to unmask]
>> cc: (bcc: Jason Smith/Lex/Lexmark)
>> Subject: Re: [TN] Mixing solder bars from different manufacturer's
>>
>>
>>
>>
>> Jim,
>> Ah there's the rub, in your last phrase - "if any quality issues could
>> arise". If it were to happen, for whatever reason, each solder bar
>> manufacturer could then point at the other. Unless you are talking a lot
>> of
>> solder I would recycle it or use it in a small static solder pot, not in
>> one
>> of your wave solder machines.
>>
>> regards,
>> Bev Christian
>> Nortel Networks
>>
>> > -----Original Message-----
>> > From: West, Jim [SMTP:[log in to unmask]]
>> > Sent: Wednesday, July 28, 1999 4:40 PM
>> > To: [log in to unmask]
>> > Subject: [TN] Mixing solder bars from different manufacturer's
>> >
>> > Hi all,
>> >
>> > This might be a silly question, but I received some left over solder
>> from
>> > a
>> > customer that is made by a different manufacturer than what we use.
>> Both
>> > solder bars are 63/37 and I want to know if you can mix solder from
>> > different manufacturers, I'm not sure if manufacturers do anything
>> > different
>> > with their product or if any quality issues could arise.
>> >
>> > Thanks,
>> >
>> >
>> > Jim West
>> > Manufacturing Engineer
>> >
>> > ##############################################################
>> > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>> > ##############################################################
>> > To subscribe/unsubscribe, send a message to [log in to unmask] with
>> > following text in
>> > the body:
>> > To subscribe: SUBSCRIBE TECHNET <your full name>
>> > To unsubscribe: SIGNOFF TECHNET
>> > ##############################################################
>> > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
>> > additional
>> > information.
>> > If you need assistance - contact Gayatri Sardeshpande at [log in to unmask]
>> or
>> > 847-509-9700 ext.5365
>> > ##############################################################
>>
>> ##############################################################
>> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>> ##############################################################
>> To subscribe/unsubscribe, send a message to [log in to unmask] with
>> following text
>> in
>> the body:
>> To subscribe: SUBSCRIBE TECHNET <your full name>
>> To unsubscribe: SIGNOFF TECHNET
>> ##############################################################
>> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
>> additional
>> information.
>> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask]
or
>> 847-509-9700 ext.5365
>> ##############################################################
>>
>> ##############################################################
>> TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>> ##############################################################
>> To subscribe/unsubscribe, send a message to [log in to unmask] with
>> following text in
>> the body:
>> To subscribe: SUBSCRIBE TECHNET <your full name>
>> To unsubscribe: SIGNOFF TECHNET
>> ##############################################################
>> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
>> additional
>> information.
>> If you need assistance - contact Gayatri Sardeshpande at [log in to unmask]
or
>> 847-509-9700 ext.5365
>> ##############################################################
>
>##############################################################
>TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
>##############################################################
>To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in
>the body:
>To subscribe: SUBSCRIBE TECHNET <your full name>
>To unsubscribe: SIGNOFF TECHNET
>##############################################################
>Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
additional
>information.
>If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
>847-509-9700 ext.5365
>##############################################################
>
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################
|
