Electronics Forum | Thu Jun 27 03:03:57 EDT 2019 | SMTA-David
Hi, I have a small assembly line that consists of a Semi-Automatic Stencil machine, a Samsung Pick and Place, a small IR reflow oven and a wave soldering machine. The reflow oven is presenting the biggest bottleneck. The machine is a small IR (T960
Electronics Forum | Thu Jul 25 23:59:37 EDT 2019 | vickygao
Hi, According to your information,5 zones reflow oven can't meet your requirmens now.We advice use 8 zones rlow oven. These times we designed a new 8 zones reflow oven, more economic,more power save.And function is better than old units. I m a sal
Electronics Forum | Thu Apr 15 16:33:40 EDT 2004 | wgaffubar
We never really use to calibrate the thermocouples on our reflow oven or wave solder systems, but we did disconnect the T/C's and input a calibration standard to check that the computer cards were correctly reading the proper temperature for a given
Electronics Forum | Mon Apr 14 13:24:32 EDT 2008 | mmjm_1099
We had an order using a 2up PCB (same manufacturer) with same components and same board layout without any problems. Perfect run. The next order ran on the same day with same paste using same parts, same layout, same profile, but different 2up PCB h
Electronics Forum | Sun May 23 07:13:56 EDT 1999 | Scott Cook
| Has anyone had any experience or data using vibration during the reflow process. | We introduced a vibration device attached to the fixed rail on a Vitronics reflow oven. The reason was to prevent skewing on large PLCC devices. The process worked v
Electronics Forum | Wed Apr 16 09:02:09 EDT 2008 | tonyamenson
One issue stated incorrectly was that the work order that had no problems, with the same layout and same parts, is a one up at SMT. The problomatic units are two ups. I know the first instinct is to say the profile, but we have run this assembly man
Electronics Forum | Thu Apr 15 20:41:22 EDT 2004 | Ken
There are ledgitimate reasons for checking furnace calibrations, but let me clarify what that is. 1. TC's are not necessarily calibrted. Not unless you need "absolute" accuracy. TC's operate against a (non-linear) standard +/- a tolerance. Most
Electronics Forum | Wed Sep 16 00:03:55 EDT 2009 | linseeg
We encoutered few PCB after IR reflow the PCB pad change color from silver to yellowish / brownish. Our IR reflow peak temp is ~250 degree. The brownish cannot be remove with IPA as well. What is the main reason causing this issue?
Electronics Forum | Thu Sep 17 04:48:51 EDT 2009 | grahamcooper22
The colour you see on the pads is tin/copper intermetallic layer. In your reflow the immersion tin coating and the copper pad underneath react to form in intermetalic layer. The effect is worse the hotter the pcb or area of the pcb gets. In IR reflow
Electronics Forum | Fri Sep 18 07:32:53 EDT 2009 | karthikthebest
I agree with Graham cooper's input. Also note that the brownish color is incremental w.r.t to number of days you hold after the thermal cycle(example: after the reflow)so try to complete all thermal cycles ASAP to lessen the discoloring.
