Electronics Forum | Wed Feb 25 21:37:12 EST 2015 | dinhhuunam
Hi Bartel , 1.1 Profile Solution to Cold Soldering Cause for Cold soldering The peak temp of reflow is too low. The preheating temp is too high and it takes too long Solution Lower the preheating temp and increase the peak temp in the reflow zone
Electronics Forum | Wed Nov 20 07:50:00 EST 2002 | aerineng
Hi, I'm an SMT refugee working in component manufacture - hey, times are hard! I've been asked by a customer to test some of my parts at high temperature on the wave - up to 360 deg Celsius. I've checked my wave and it's only capable of getting up
Electronics Forum | Wed Aug 30 07:18:27 EDT 2000 | russells
Can you use 96s solder wire on a pcb that has been plated with standard 60/40? if so what are the effects on the proerties of the 96s? If you cannot mix the two solders is there a more effective way than braid of removing the 60/40 from the plating?
Electronics Forum | Wed Aug 30 16:00:42 EDT 2000 | Dave F
Russells: You can mix the two solders you mentioned, assuming by "96s" you meant "96Sn / 4Pb". If you heat the two tin / lead alloys to a liquid state, you�ll form a tin / lead solution with properties different from either of the two solders. The
Electronics Forum | Wed Nov 20 10:50:49 EST 2002 | dphilbrick
Kester has a special alloy for high temp soldering. Alloy 123. I would think that if you coocked 63/37 to 360c you would have a pot of dross in no time! Doug
Electronics Forum | Tue Feb 24 15:40:08 EST 2015 | mbartel
I'm new in this industry and need a little direction. I have a wide verity of SM parts on a board, top and bottom. The larger components have a very nice reflow, good shine. The 0402/0201's has a dull almost cold solder look. The boards function and
Electronics Forum | Tue Feb 24 16:40:54 EST 2015 | duchoang
Could you show us the reflow profile and 0402/0201 pictures? I have had the same situation before just because insufficient solder paste ( Specially on 0201) and maybe not enough heat reflow profile.
Electronics Forum | Tue Apr 28 16:20:06 EDT 2015 | warwolf
Is this solder lead or lead free? Try look at the delta of the PCB during re-flow, you might find that the smaller parts are being "cooked" faster and burning off the flux.
Electronics Forum | Thu Apr 16 10:11:51 EDT 2015 | hugh_manatee
Your solder paste manufacturer’s profile is just a “guideline.” You can customize your profile to meet your product’s need. For better grain-structure (shiney-ness) try a ramp soak spike profile keeping your preheat temps very low before your reflo
Electronics Forum | Wed Mar 11 17:32:46 EDT 2015 | jlawson
Small paste deposits have less flux thus less flux activity to enhance the wetting. So preheat needs to be as short as possible, ramp to spike if possible. Try not to ramp hold and spike - pending thermal delta on product can be made to ramp to spike
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