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Soldering electrolytic capacitor

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#77883

Soldering electrolytic capacitor | 21 June, 2017

Hello,

I have an assembly that I am considering to run in a regular process(SMT, Wave)and afterwords solder 22 electrolytic capacitors. Due to the multi-layer board it is not an easy task, so I was wondering if you guys know any trick how to do that? Any small machine or specialized soldering tip?

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#77885

Soldering electrolytic capacitor | 21 June, 2017

> Hello, > > I have an assembly that I am > considering to run in a regular process(SMT, > Wave)and afterwords solder 22 electrolytic > capacitors. Due to the multi-layer board it is > not an easy task, so I was wondering if you guys > know any trick how to do that? Any small machine > or specialized soldering tip?

Try a preheater. PACE (I rep them) makes a great one.

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#77887

Soldering electrolytic capacitor | 21 June, 2017

I agree that a preheater would be a good thing to try. Before you buy one, try heating your boards up in an oven, then putting them on your machine. Any oven will do, just make sure you leave them in long enough to get a good thermal soak.

Also, as a last resort, you could top-flux. Its messy, and thus makes cleaning it afterward that much more difficult. That said, i have seen it work.

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#77892

Soldering electrolytic capacitor | 22 June, 2017

Any possibility of having some changes made to the PCB for future runs? Can the ground connections be modified to have thermal relief patterns?

At one time occasionally people would come to me to tell me that the power was out at their work station island. And I would think, "I know where the preheater is today".

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#77897

Soldering electrolytic capacitor | 22 June, 2017

Guys I didn't mention that the electrolytic caps are SMT.

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#77899

Soldering electrolytic capacitor | 22 June, 2017

So why are you back adding or hand soldering?

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#77903

Soldering electrolytic capacitor | 23 June, 2017

My pallet is 13mm high(because of electrolytics)and I have a issues with TH parts. Removing them will reduce my pallet height significantly and will fix my current issues.

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#78001

Soldering electrolytic capacitor | 27 June, 2017

Sounds like a selective soldering machine would be your ultimate answer. But if you must hand solder, an oven, preheater or anything to heat the core of your board would help as mentioned before. We've used hot plates with success.

As far as irons go, we like the Metcal MX-5000 series. They can solder just about anything we throw at it. Using a larger tip should help too.

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#78006

Soldering electrolytic capacitor | 28 June, 2017

Guys, I was more thinking about some of these soldering robots(to automate the process). Has anyone used any of these?

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#78060

Soldering electrolytic capacitor | 4 July, 2017

Evtimov,

Indeed. What are you interested in:

- selective soldering machines - soldering robots (laser etc)

?

Regards

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#78080

Soldering electrolytic capacitor | 5 July, 2017

As I am soldering SMT electrolytic capacitors - I guess, soldering robot.

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#78279

Soldering electrolytic capacitor | 12 July, 2017

Soldering electronic components like electrolytic capacitors can be some of the most difficult terms in PCB repair. Electrolytic capacitors, like other components, come in two main formats. 1. Through-hole capacitors have long leads designed to pass through holes in the circuit or proto board. 2. Surface Mount Devices (SMDs) which include flat contacts that sit flush atop the board. Through-hole electrolytic capacitors are usually cylindrical or can shaped. Exceptions to this rule occur with power film capacitors and some high-voltage ceramic power caps. However, SMD electrolytic capacitors retain their basic profile, but their markings are on top and their bases include a rectangular block.

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#78280

Soldering electrolytic capacitor | 12 July, 2017

Aaaand how does this help ? This was a soldering question. He knows it's difficult, he's asking for soldering advice not a definition of what the components are.

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#78281

Soldering electrolytic capacitor | 12 July, 2017

Another option you can try is to use solder paste with a dispensing machine and then use a hot air gun to reflow the solder paste on the smd caps

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#78282

Soldering electrolytic capacitor | 12 July, 2017

Yes Bruce I was thinking about that - some air gun with small neck and well controlled air flow. Do you guys have any recommendations on a gun like that?

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#78285

Soldering electrolytic capacitor | 12 July, 2017

When i considered using one I bought a cheaper brand named aoyue which cost less then $140 U.S. just to see if it would work for what we were trying. It did work but our engineering dept wound up scrapping it and doing a redesign. I was going to get a hakko which can run anywhere from $800 to almost $2000 depending on the system you want which is why i went with cheap one first. I would see if you could get a distributor to give you a demo and possibly let you use one in house to see if it can fit your needs. They do take some practice to hold it at the right height so you don't blow parts around with it.

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