Electronics Forum | Wed Oct 23 14:45:00 EDT 2002 | Tom G
I haven't tried anything like that but had some experience with .8 mm pitch SSOPs. Immersion depth in wave was very critical- had to control Lambda pump speeds within 20 RPM and even then it would change as solder level dropped. Need thieving pads o
Electronics Forum | Wed Feb 12 16:23:30 EST 2003 | russ
I agree with DDave, You have something else wrong! .100 dips with .05" lead protrusion should not bridge (in fact I would think that it would be almost impossible). Tell us about your machine, (laminar flow, A-wave, etc.., size of nozzle, wave heig
Electronics Forum | Wed Apr 24 21:34:01 EDT 2002 | davef
Search the fine SMTnet Archives. Guidelines * Control: Flux specific gravity, preheater temp, conveyer speed, solder temperature. * Two most important parameters are: solder temperature & dwell time * Contact time. The optimum contact (dwell) time
Electronics Forum | Mon Feb 28 13:13:25 EST 2005 | russ
ING, you had to nake it difficult didn't ya! It appears that all of your parameters are okay. When you state that "sometimes there is a residue" is it liquidous or dry? Is your spray fluxer an ultrasonic or a spray gun head? You may not be getting
Electronics Forum | Wed Feb 15 08:47:09 EST 2006 | pjc
Yes, doing the DoEs on your wave to achieve optimum settings that deliver the best results on your worst board is correct method. If not clear on the process, there are still wave solder process classes out there you can attend or hire in-house. If y
Electronics Forum | Fri Feb 20 12:55:43 EST 2004 | russ
Ah, the old contour wave. I don't really know how to adjust those to get correct backflow to reduce your solder volume. I need to ask why you are worried about this. Do you have a QC requirement in excess of IPC class3 wich allows for this joint t
Electronics Forum | Mon Jan 04 11:32:59 EST 1999 | Chrys
| Anyone have any experience with ECD's Waverider/MOLE profiling equipment? If so, were they positive experiences? | I use ECD's mole for profiling in the wave and a KIC for profiling in reflow. I like the KIC a whole lot better for a couple of re
Electronics Forum | Fri Feb 16 02:00:12 EST 2001 | PeteC
Dreamsniper, The optimum contact (dwell) time in the wave should be 2 seconds. Contact band width is a function of conveyor speed. For an example, 5cm of contact band width at 150cm/min. conveyor speed will give you 2 seconds of contact time and 2cm
Electronics Forum | Thu Jul 14 16:05:55 EDT 2005 | russ
Good answer slthomas! This has got to be the biggest misconception out there. To perform SPC on a wave process you must first perfrom DOE to determine the critical parameters and or control limits. For example you will need temp reading devices tha
Electronics Forum | Thu Jul 17 20:20:12 EDT 2008 | davef
Wave set-up DOE * Immersion depth [1/3 to 2/3 of board thickness] has the least impact of any variable in wave soldering. * Contact length the greatest impact. * Control flux density, time through preheaters, top side temperature as the board reaches
