Questions and Comments

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Sep 21, 2020
Selective Solder Pot Temperatures
Jim has listed many key considerations for the SS equipment. I would argue that it is the product or PCB that determines the amount of heat in the solder pot. The critical SOLDERING temperature is ...
Ike Sedberry, ISEDS

Sep 14, 2020
Cleaning R.F. Circuits - Aqueous or Vapor?
"Insolve" was mentioned as the cleaning solvent. Did the person who asked the question mean "Ensolv?" If so, and if the main solvent is n-propyl bromide, I am very concerned that, with an exposure limit ...
Beth Bivins, 3M

Sep 9, 2020
Removing Warpage from PCBAs
There are many factors can make PCBA warpage. The provided info is not enough e.g. laminate type, Tg, copper density across PCB is uniform? Thick or Thin PCB? e.g. Laminate with less Tg or with ...
Pongtip P, Celestica Thailand Ltd.

Sep 9, 2020
How Do You Remove Oxidation from PCBs?
I would assume that H.M.'s question is not merely theoretical, but was prompted by a visual observation, perhaps some discoloration, that they interpreted as "a small amount of oxidation." As Joe pointed out, root cause ...
Alan Couchman, Process Sciences, Inc.

Aug 30, 2020
Video Analysis of Solder Paste Release from Stencil Printing
Nice experiments and anyone that knows me I love to use video as its so revealing in process development. The first work like this was conducted by one well know supplier of paste and printer ...
Bob Willis

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