Electronics Forum | Mon Nov 08 11:00:53 EST 2004 | davef
It's possible your supplier has not thought through the results of their conversion to lead-free throughly. We'd expect something like: Reflow Parameters||Pb Assy||Pb Free Peak Temp.||235�C �5�C||255�C �5�C Time Within 5�C Peak Temp.||20 to 40 sec.|
Electronics Forum | Thu Jul 20 13:08:35 EDT 2000 | Bob Willis
The solder paste formulation is different 63/37 is a tin lead alloy so t here is one difference from a lead free. Yes you can get no clean lead free products but if you compare the amount of visible residues they will be normally higher. So far most
Electronics Forum | Tue Aug 02 22:49:55 EDT 2005 | davef
IPC-A-610D Section 5, shows a variety of photographs of: * Good lead-free solder connections * Lead-free soldering anomalies Hot Tear / Shrink Hole is one such anomaly. This shrinkage effect appears primarily on wave-soldered joints, but can also
Electronics Forum | Tue Mar 18 05:32:09 EDT 2008 | gregoryyork
What volume of boards are you putting through. 1Kg per hour does sound very high but then again it does depend on volume Using an antioxidant is a must with Lead Free some alloys have additions in them to start with but those drop out with use so th
Electronics Forum | Wed Feb 21 12:01:13 EST 2007 | itwasbill
Hi all, What are some of the must do, cannot go without changes to our process and equipment before we adopt a lead free process? Would we have to completely change out our ovens? I thought I read that using old ovens was a no-no. I just began
Electronics Forum | Wed Aug 03 21:29:59 EDT 2005 | Ken
Yes, lead can promote fillet lift. In order to understand this defect you must begin looking at your lead frame mateials. some lead frames are more susceptable to this disorder. This is most likely a cte mismatch disorder. Lead contamination in
Electronics Forum | Tue Feb 27 12:16:19 EST 2007 | wavemasterlarry
hahaha! LISTEN, everyone knows that oven get dirty. They need periodic cleaning. So if you run lead boards thru your oven you will get lead dust and residue in you're oven. If you want to be truely lead free you need to get all the lead outta of
Electronics Forum | Tue Sep 11 22:40:26 EDT 2007 | philip_yam
We are testing SAC paste for thru-hole components in the 2nd reflow process. The solder joint is alright but some problem encountered in FR1 or CAM2 PCB after multiple times of reflow due to the temperature. We are very interested in Zn or Bi-based l
Electronics Forum | Wed Aug 10 10:41:23 EDT 2005 | patrickbruneel
Bob, Great theory if you're selling SN100C, but I have to disagree that an alloy being 4�C off eutectic will cause cracks. When a solder joint exits the solder wave, there is an immediate drop in temperature of 100�C. so being off 4�C is irrelevant.
Electronics Forum | Mon Jul 16 10:26:54 EDT 2007 | davef
Ed: We agree with you that leadfree parts can be used with leaded paste. We disagree that lead part can be used with leadfree paste. Here is link to a previous discussion here on SMTnet on the topic: http://www.smtnet.com/forums/Index.cfm?CFApp=1&M
