Ben,

Many passive SMT component manufacturers say to not touch the part with a soldering iron, so transfer soldering is the only way to do it by hand.  The caveat here is liquid flux will make all the difference in heat transfer and quality of solder joint.

For SOIC and similar type leaded SMT components I was taught to flux the part and drag a solder loaded iron across the pins.

These have worked for me, but I'm not doing production.  I do R&D prototypes, repairs and modifications.

For good heat transfer you need to start with a small amount of solder on the tip, but you already knew that.

Just my 2 cents.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Wednesday, April 08, 2015 9:47 AM
To: [log in to unmask]
Subject: Re: [TN] EXTERNAL: Re: [TN] Transfer Soldering

No, I mean applying solder to the iron, and then transferring it to the joint.

Ben

From: David Hillman [mailto:[log in to unmask]]
Sent: Wednesday, April 08, 2015 9:45 AM
To: TechNet E-Mail Forum; Gumpert, Ben
Subject: EXTERNAL: Re: [TN] Transfer Soldering

Ben - do you mean dippable solder paste?

Dave Hillman
Rockwell Collins
[log in to unmask]<mailto:[log in to unmask]>

On Wed, Apr 8, 2015 at 8:40 AM, Gumpert, Ben <[log in to unmask]<mailto:[log in to unmask]>> wrote:
Technetters,

Anyone have comments on transfer soldering?
It's identified in an IPC video as one of the seven sins of soldering, but seems to be focused on non-visible joints like through hole, as opposed to SMT or wire soldering.

There was a paper mentioned on Technet a while back which claimed transfer soldering was just as good as 'normal' soldering, but there was just a link to the abstract.

Ben

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