|Ask the Experts|
September 16, 2009
Solder Joint Rework Technique
What is the proper way to rework an insufficient plated through hole solder joint? Is it acceptable to touch up joints from the top side as opposed to the solder side? Is top side touch up not recommended?
|Expert Panel Responses|
Apart from using a solder iron and solder wire, a solder preform can be used to rework the through-hole joint. In this case, donut preform (that comes prefluxed) can be placed on top of the pins. A heat gun is used to melt the preforms for complete hole fill. The manual component is removed;eliminates the fluxing step; the solder volume is consistent from pin-to-pin; and all preforms can be melted in 1 shot.
Technical Manager - Europe
IPC has an entire rework standard which will directly specify the proper method of PTH rework. In most cases, you will address the solder joint from the solder side with the iron touching the lead/pad simultaneously and for the minimum amount of time. The solder wire, will be introduced from the opposite side. Rework and what you are accomplishing, is specific by part and iron technology. IPC 7711 is your best source to decipher your issue and approach.
Capital Equipment Operations Manager
Specialty Coating Systems
If you try to touch up from the top side, you could create a void within the plated thru hole. I would suggest you apply flux, desolder the connection and then solder the joint properly and preferably with a direct power soldering iron, this will ensure sufficient heating to reflow the entire connection from top to bottom.
Regional Sales Manager
OK International Inc.
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