Electronics Forum: joint (Page 1 of 334)

joint strength

Electronics Forum | Wed Nov 26 11:19:58 EST 2008 | vladig

I don't think you can find any specs on that. As long as a solder joint can not be broken by virtually "blowing over it" any reading on the UTS, or shear strength can be very confusing. You can specify, though that the assembly (joint) should withsta

bulbous joint

Electronics Forum | Thu Feb 19 08:57:20 EST 2004 | northern

Has anyone ever seen a bulbous joint (on 1 side of 1 designator) on every board? I checked the preheat profile at the wave and have played with dwell times but can't get rid of it. I checked the archives and didn't find much. Any help would be apprec

bulbous joint

Electronics Forum | Sat Feb 21 09:00:30 EST 2004 | davef

Here's another idea to try: Rotate the boards 90*

bulbous joint

Electronics Forum | Fri Feb 20 14:05:45 EST 2004 | northern

I talked QC into accepting the bulbous joint, the problem was it was often shorting to a well placed via next to it. I say WAS because I reduced the dwell time in the main wave (you are correct 50/50 flow) to approx. a nanosecond, which reduced it en

joint strength

Electronics Forum | Wed Nov 26 09:16:59 EST 2008 | barryg

Hello everyone, after a short layoff I am glad to be back. I have a question. I have a button (snap button) that is being soldered to a strip of sac coated copper. We are questioning the joint strength of this from our vendor as we see these popping

bulbous joint

Electronics Forum | Fri Feb 20 07:50:46 EST 2004 | northern

Dave, you are correct they DID move (blows my theory on bad parts)! I will update with the info. you brought up but I have 1000 of these boards on the line as we speak, any ideas on a quick fix? Inquiring managers want to know! th

bulbous joint

Electronics Forum | Fri Feb 20 08:44:05 EST 2004 | davef

Lucky guess, eh? [Sorry to blow your theory on bad parts] A 1000 of these boards on the line, ummm. Two ideas to consider: * Increase the conveyor angle [don't get carried away, just keep the angle below 8*]. * Balance the flow of solder so that th

bulbous joint

Electronics Forum | Mon Feb 23 20:19:15 EST 2004 | greg york

Has anyone ever seen a bulbous joint (on 1 side > of 1 designator) on every board? I checked the > preheat profile at the wave and have played with > dwell times but can't get rid of it. I checked > the archives and didn't find much. Any help wou

bulbous joint

Electronics Forum | Thu Feb 19 13:43:01 EST 2004 | northern

What would cause this? Too much pre-heat, not enough, too much dwell, not enough? I am staying within the flux specs for preheat and can't seem to affect it much. Can board/parts contamination lead to this? I think that is a reach but I'm runnin out

bulbous joint

Electronics Forum | Thu Feb 19 09:02:43 EST 2004 | russ

This is a pretty common sympton when wave soldering chip components. As a note IPC allows for this in wave process. The problem is in the pell off of the wave and you may not be able to fix. Is your back flow off of the wave only present when a bo

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