Electronics Forum: appearance (Page 1 of 138)

Flux appearance

Electronics Forum | Wed Mar 15 09:52:34 EST 2006 | vicknesh28

It does leave a saddle like appearance on the solder

Surface appearance

Electronics Forum | Wed Feb 22 05:10:26 EST 2006 | bobpan

Maybe you should reject the rejecter???? Is that a double negative???

Flux appearance

Electronics Forum | Wed Mar 15 09:42:17 EST 2006 | slthomas

Is the lead leaving a depression in the solder that wetted the pad or is there maybe just not enough solder to fill the gap?

Flux appearance

Electronics Forum | Fri Mar 17 09:24:22 EST 2006 | russ

nothing appears to be out of line. Is this KOKI a no-clean or water soluble? You may want to try to hit 225 at the problem lead with a TAL of 70 sec. You may also want to remove the soak or at least shorten if you can. We were talking about a s

Flux appearance

Electronics Forum | Wed Mar 15 00:44:39 EST 2006 | vicknesh28

Would i be able to judge how good is a reflow profile from the appearance of the flux residue? Often times i come across flux (not sure if residual) between a non-wet QFP lead and the reflowed solder paste on the pad (it's sandwiched between the bott

Surface appearance

Electronics Forum | Wed Feb 22 04:07:04 EST 2006 | slaine

who rejected it? , sounds like an average leadfree solder joint. you could section it to help prove its good.

Flux appearance

Electronics Forum | Wed Mar 15 08:52:46 EST 2006 | russ

Best way to judge how good a profile is by measuring it. It is not real accurate to determine by the amount of residue left. You should be able to tell if the lead is bent causing the open.

Flux appearance

Electronics Forum | Wed Mar 15 09:01:11 EST 2006 | Vick

The lead was inspected for coplanarity and it's within the specification it's designed for and doesn't show any variation in terms of height as compared to it's adjacent lead that has good wetting

Flux appearance

Electronics Forum | Wed Mar 15 09:21:40 EST 2006 | vicknesh28

Thanks for the input. Just one question. Is what i am seeing normal? I am refering to the flux being between the lead and molten paste after the reflow process. This only found on a non-wetting lead.

Flux appearance

Electronics Forum | Wed Mar 15 11:19:43 EST 2006 | slthomas

Based on that criteria I would also guess profile but as has been stated, you don't really know w/o profiling.

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