Electronics Forum: soldering problem (Page 1 of 507)

QFP144 soldering problem

Electronics Forum | Tue Sep 25 14:43:28 EDT 2007 | mun4o

Hi, we change Kester with Interflux and all it is OK.The problem was paste Regards

QFP144 soldering problem

Electronics Forum | Fri Sep 14 14:20:23 EDT 2007 | sjcdcheu

What is the surface finished of your board and what is the peak temp at your solder joint?

QFP144 soldering problem

Electronics Forum | Mon Sep 10 18:04:28 EDT 2007 | slthomas

How are you attaching your thermocouples to measure the temperature of the lead/pad connection?

QFP144 soldering problem

Electronics Forum | Mon Sep 10 15:49:28 EDT 2007 | mun4o

Hi, the solder on the pad is not molt.Temperature of the leads is about 220*C( I change this T from 214 to 232) but result is same - solder is granular and not diffuse.I think the T on leads is not enough high,bu I can't increase because the max T on

QFP144 soldering problem

Electronics Forum | Wed Sep 05 08:10:45 EDT 2007 | davef

Questions are: * Do not judge the quality of a solder connection by the shineyness or color of the solder connection. Do you have smooth and unform flow, no pitting, and good wetting to the lead and the pad? * What is the temperature of the leads of

QFP144 soldering problem

Electronics Forum | Sat Sep 15 01:42:36 EDT 2007 | mun4o

Hi, I attach the termocouples with high temperature solder wire, at the QFP pins.Other thermocople I attach at package with high temperature tape.

QFP144 soldering problem

Electronics Forum | Wed Sep 05 07:07:25 EDT 2007 | mun4o

hi, I have a big problem with soldering uP QFP144 package.All components in PCB are small, only this chip is big and I can't make good temperature profile.Solder joints of other components are shining and with good wetting, but in QFP leads solder j

QFP144 soldering problem

Electronics Forum | Tue Sep 11 08:00:46 EDT 2007 | hussman

HOW did you change the temp? Stay that course till you achieve the temp you need. Try slowing the conveyor as well.

QFP144 soldering problem

Electronics Forum | Thu Sep 13 13:36:46 EDT 2007 | russ

switch pastes and see what happens, Kester had issues with their fluxes a little while ago and you may have gotten one of the bad batches. R

QFP144 soldering problem

Electronics Forum | Mon Sep 17 01:43:05 EDT 2007 | mun4o

hi, finishing is lead free HAL, Tpeak=214-232*C in diferent profile, wich we made.

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