Author Topic: An alternative method for soldering through-hole components  (Read 7237 times)

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Offline tooki

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Re: How to solder through-hole parts properly
« Reply #25 on: March 15, 2019, 11:38:30 am »


LOL there are so many things wrong in this video I don't even know where to start. And the biggest problem is that this guy is... a teacher in a faculty? In whose hands do our poor sons end up these days? Just imagine how wet one's got to have the sponge to say "when the tip touches the sponge the temperature drops".
They're teaching to NASA standards, which were designed for high reliability. So… sorry, gonna believe them more than you.

As for tip temperature dropping when touching the sponge: when lead-free soldering came about, the soldering equipment vendors all studied why it is that their existing tip designs failed so much more quickly when doing lead-free. And one reason (not the only one) is the thermal shock of touching the damp sponge. At the higher lead-free temps, the shock caused micro-cracking in the plating, allowing solder to touch the copper core material, dissolving it away. So this isn't an imagined problem, it's based on actual scientific study. (The solution is the brass wool we now use. That and thicker plating on the tips.)
 

Offline tooki

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Re: How to solder through-hole parts properly
« Reply #26 on: March 15, 2019, 02:17:17 pm »
Many cheap components use tinned steel leads. Take a magnet to them sometime, you'll be surprised. Similarly, see how some rust...

Kovar and alloy 42 are also magnetic.

Sure, but how often is one soldering those to a PCB??

Ever solder a 1N4148 diode or a film resistor?
D’oh! Yes, diodes. Totally slipped my mind. When I think of glass, I immediately think of light bulbs and neons and the like. But you’re right of course!!
 

Online wraper

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Re: An alternative method for soldering through-hole components
« Reply #27 on: March 15, 2019, 02:26:25 pm »
Electrolytic caps often have iron leads.
 

Offline soldar

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Re: An alternative method for soldering through-hole components
« Reply #28 on: March 15, 2019, 02:44:02 pm »
Electrolytic caps often have iron leads.

I believe they are discussing making them of plastic.  :P
All my posts are made with 100% recycled electrons and bare traces of grey matter.
 

Online wraper

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Re: An alternative method for soldering through-hole components
« Reply #29 on: March 15, 2019, 02:52:13 pm »
Electrolytic caps often have iron leads.

I believe they are discussing making them of plastic.  :P
BGA sometimes have metal plated plastic balls.
 

Offline Kasper

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Re: An alternative method for soldering through-hole components
« Reply #30 on: March 15, 2019, 03:20:50 pm »

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).

"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.
 
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Online wraper

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Re: An alternative method for soldering through-hole components
« Reply #31 on: March 15, 2019, 03:26:16 pm »
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
« Last Edit: March 15, 2019, 03:39:50 pm by wraper »
 

Offline donmr

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Re: How to solder through-hole parts properly
« Reply #32 on: March 15, 2019, 03:45:13 pm »
Many cheap components use tinned steel leads. Take a magnet to them sometime, you'll be surprised. Similarly, see how some rust...

If you care about reliability then don't use cheap parts.
 
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Online joeqsmith

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Re: An alternative method for soldering through-hole components
« Reply #33 on: March 15, 2019, 05:08:42 pm »
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

Offline Shock

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Re: An alternative method for soldering through-hole components
« Reply #34 on: March 15, 2019, 05:41:36 pm »
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.



Soldering/Rework: Pace ADS200, Pace MBT350
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Offline soldar

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Re: An alternative method for soldering through-hole components
« Reply #35 on: March 16, 2019, 11:37:36 am »
Regarding soldering techniques they have all been invented long time ago and, let's get real, it is not the same to be soldering in a clean room boards that will go on a satellite payload than a quick and dirty repair on a sprinkler control which is inherently unreliable anyway and you can repair every year.  I have done plenty of soldering which is nothing to be proud of but it was quick and sufficient for the intended repair. 

What is important is to understand what factors lead to good soldering and what factors can lead to problems and why. Then a trained and experienced operator can decide what is best in each case.


Regarding the making of Youtube videos, there are two considerations, content and presentation and both better be pretty good unless one is so outstanding that the other does not matter. If you find and post a video of president Kennedy getting shot we will probably forgive the unstable and shaky images.  On the other hand, if you have a perfectly choreographed show of cheerleaders bouncing their tootsies around I am not going to complain that I did not learn anything substantial from that video.

Some people think "Oh, my baby is so cute, let the world see how cute my baby is!". Those are the same people who think their farts have a very pleasant smell.

Youtube videos have become very competitive and need to have both quality content and editing. I think people do not realize how much work goes into making successful Youtube videos.  Take This Old Tony for instance. His videos have high quality content but are very funny, well scripted, well edited. Normally it would take a team of people to produce that kind of quality.

A lot of Youtubers just let the camera roll while they are doing something. "How to build a workbench!" and you see 45 minutes of a guy using a table saw and other tools from which you learn nothing because you already know how to use those tools. Some basic drawings, diagrams and plans tell you much more than watching the guy at work.

Have a basic script which is as short as possible while getting in everything indispensable. And then cut it in half.
All my posts are made with 100% recycled electrons and bare traces of grey matter.
 
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