Electronics Forum: soldered (Page 745 of 2103)

Use of Pb-free Components

Electronics Forum | Thu Mar 18 23:04:49 EST 2004 | martz

A lot of component vendors already shifted to Pb-free products but our process is still using 63Sn/37Pb solder paste and SMDs. What would be the result if we introduce some Pb-free components to our current process (i.e without changing the reflow p

wrinkles solder joints after double reflow

Electronics Forum | Mon Mar 22 19:46:17 EST 2004 | pdeuel

The bottom side is going into reflow somewhare near melting point of solder. Reduce bottom side temprature. Get a good mole so ramp and soak tempratures can be checked on bolth sides of the PCB. The object is to keep bottom side parts from approching

PCB post reflow cleaning

Electronics Forum | Tue Mar 30 02:58:55 EST 2004 | Grant Petty

Hi, Thanks for the ideas. With the solder mask curing problems, can you normally wipe off the white residue, as we can do this on our boards with our fingers. It's almost like the surface of the board has a "wet dried up" look to it, and it's a smok

buying guide for used double wave solder and ICT machine

Electronics Forum | Wed Mar 31 20:49:11 EST 2004 | marcowong

We are trying to buy used double wave solder and ICT machine and we need some advice on selecting the machine and things to be cautious with. It will be greatly appreciated if someone can offer us good suggestions that will help us to minimise mist

QFP rework

Electronics Forum | Thu Apr 01 12:05:21 EST 2004 | babe

Heat guns scare me, hot air scares me too. Just the heck of it why not apply high temp paste to the center and eutectic 63/37 standard solder to the outside pads. The outside reflows first allowing proper seating of the component and with a proper pr

Immersion silver leaching.

Electronics Forum | Fri Apr 09 20:28:14 EDT 2004 | Ken

I have experience in this. My company offers Lead free SMT and Wave soldering. I have processed ImSn, ImAg, Enig, OSP in both smt and wave. Yes, silver leaching will occur. Yes, copper leaching will occur. High tin content solders disolve everyt

Type 4 solder paste

Electronics Forum | Tue Apr 13 08:25:15 EDT 2004 | arcandspark

I would have gone to a .004" stencil but again, the board designers, which we have no control over or are we allowed to give input to, have made the pads on all connectors and many other parts so small that we are almost seeing insuffecient solder us

Putting a center board support on lead free wave

Electronics Forum | Thu Apr 15 11:13:24 EDT 2004 | pjc

Sn corrosion effects were studied for stainless steels, coated stainless steels, titanium, cast iron, and other materials. This study can be found in the SMT Library under "Equipment Impacts of Lead-Free Soldering" Electrovert uses a Melonite coating

Can anyone recommend a reflow profile for already flowed solder?

Electronics Forum | Wed Apr 21 19:59:43 EDT 2004 | Ken

It makes no difference if the solder is in balls, ingots, bars, paste etc. The thermal profile satisfies key areas of the reflow process as a function of your flux and alloy type. Peak and duration above liquiduous are a function of the alloy. pr

solder iron tips

Electronics Forum | Wed Apr 28 12:13:57 EDT 2004 | Jack

You can find the procedures for different package types in the IPC-7711 & 7721 manuals. These can be purchased from the IPC.[http://www.ipc.org/] You can also try Circuit Technology: http://www.circuittechctr.com/guides/guides.shtml These manuals and


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