| Electronics > Projects, Designs, and Technical Stuff |
| An alternative method for soldering through-hole components |
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| Kasper:
--- Quote from: tooki on March 15, 2019, 11:33:01 am --- In the video, you also keep mentioning copper-to-copper contact, as if solder somehow produced so much resistance as to matter. It doesn't. If it did, then millions (billions?) of devices that use DIP ICs would be malfunctioning, since DIP ICs are not normally clinched in mass production (in contrast with things like resistors, whose leads are normally cut and clinched by automatic inserters). --- End quote --- "Copper to copper" contact is more about reliability than resistance. If solder cracks there is more chance of maintaining electrical connection if the lead is touching the pad. There is also less chance of solder cracking if mechanical stresses go directly from lead to PCB without going through the solder. |
| wraper:
Bending leads work well on single layer boards, it really increases reliability. I've seen a lot of those with cracked solder joints. If lead was bent, then crack in solder joint will be only partial if it happens. On boards with plated through holes, does not make much difference. BTW bending leads is a very common practice in modern SMPS which still use TH components a lot. http://www.versatecsolutions.com/samples%20pc%20boards.shtml https://youtu.be/mbuPQ_Doq0A |
| donmr:
--- Quote from: tooki on March 14, 2019, 09:29:18 pm ---Many cheap components use tinned steel leads. Take a magnet to them sometime, you'll be surprised. Similarly, see how some rust... --- End quote --- If you care about reliability then don't use cheap parts. |
| joeqsmith:
When we were using TH, leads were always processed like this. Even the semi-automatic and manual machines would use the same process. I made a video some time back showing my Eraser. https://youtu.be/DknvtBaK9lc |
| Shock:
As mentioned the method is called "clinching" and has been around forever. Here is Paces guide for component soldering, with an appropriate sized tip and time spent on each joint. The only "proper" way is the standard you are working to, which IPC covers comprehensively (more than I can explain below) in IPC-A-610 and IPC J-STD-001. Put simply, terminations should be either straight through, partially clinched, or fully clinched. Terminations in unsupported holes should be clinched at least 45 degrees. Lead trimming after soldering is acceptable as long as the solder connection is not degraded and either a reflow or inspection has been performed. They sell PCB holders with arms for convenient component holding, or whatever works best as long as it doesn't stress or damage the component or joint. |
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