Electronics Forum: plating (Page 166 of 252)

Re: Immersion Tin

Electronics Forum | Wed Jul 12 21:47:41 EDT 2000 | Dave F

Celiav: Mark is probably spot-on on his comments about a board fab problem. It is weird that you have similar problems from two suppliers though. Recommendations are: � Get rid of any bird brain contractor that installs processes that affect your

Re: Varistors that leak, political football anyone?

Electronics Forum | Thu Jul 13 05:23:30 EDT 2000 | Donnie

There a few questions that I have for you. 1. What type of flux are you using? 2. What temps are your preheaters set at? 3. Can you possibly place them on after the wave? The reason I'm asking is that there may be some adjustments to the wave to bur

Re: Soldermask Design Rules

Electronics Forum | Tue Jun 13 21:57:01 EDT 2000 | Dave F

Todd: You say: "... solder masking between the lands of fine pitch components can cause stenciling problems and or manufacturing problems." I say: Fine pitch components without solder masking between the lands can cause stenciling problems and o

Poor wetting to palladium

Electronics Forum | Mon Jan 29 06:44:59 EST 2001 | Scott B

I have recently come across a device which has a palladium over nickel finish which when soldered shows evidence of poor wetting to the lead ( i.e. a wetting angle greater than 90�) about three quarters of the way up the side of lead. This is only vi

Substrate Au/Ni thickness

Electronics Forum | Thu Feb 15 19:41:38 EST 2001 | davef

What do you mean by "But after performing temperature cycle test, the former aging rate (from the shear strength ) seems faster than the latter."? Comments are: I can't recall having heard the term "precipitation hardness" [not that that means anyt

Re: PCB washing

Electronics Forum | Sat Feb 05 21:58:08 EST 2000 | Stu Leech

I agree with all of the previous comments. 1) Here are a few things to keep in mind when cleaning with water. To effectively clean, any liquid must wet the surface. By itself, water has a surface tension of 70 dynes/square cm. This is relaively hig

Re: Gold Repair

Electronics Forum | Fri Oct 01 23:43:28 EDT 1999 | Jeff Ferry

Can someone help me find info on gold repair? I know it can be done, but I need to know how expensive it is, etc. Paul: The following seel gold finger repair kits, in-case you haven't had your dose of heavy metals: Hunter Products 79

Re: Time to use alternative finishing ???

Electronics Forum | Fri Sep 10 14:32:49 EDT 1999 | John Thorup

We have a product, with various PWBs, with over 600 parts each one (We are a low Volume/high mix company with an average component placement per PCB between 250 to 300 parts). This PWBs have 7 to 10, 20 mils pitch parts. We are having problems with

Re: Time to use alternative finishing ???

Electronics Forum | Mon Sep 13 05:02:19 EDT 1999 | Brian

We have a product, with various PWBs, with over 600 parts each one (We are a low Volume/high mix company with an average component placement per PCB between 250 to 300 parts). This PWBs have 7 to 10, 20 mils pitch parts. We are having problems with

Re: Wave solder edge covers

Electronics Forum | Wed Jun 30 11:38:05 EDT 1999 | Brian Conner

We are wave soldering some fabs with a lot of unmasked trace area along the edges. The trace area is solid copper covered with tin / lead, no masking, no components along the edges, same on solder side and component side (goofy board design). Ins


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