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Through hole pins not soldering

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#85668

Through hole pins not soldering | 23 September, 2020

I have modules that come with a 4 x 2 pin header. The problem is the pins must be oxidized as they do not take solder (no wetting occurring). This occurs whether solder in our wave soldering machine or soldered by hand. I tried cleaning the module in Ultra-sonic bath with IPA but did not help. Can someone provide a recommended method of cleaning up the pins so they will wet properly? Thanks

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#85676

Through hole pins not soldering | 23 September, 2020

Try to pre-tin the part. This should give you a lot of answers.

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#85680

Through hole pins not soldering | 24 September, 2020

In my opinion, it is not possible to eliminate the oxidation in a component because oxidation it is not removable .. the only solution is to apply a mechanical operation (scraping) and then tinning the part..

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#85683

Through hole pins not soldering | 24 September, 2020

If whatever is preventing the leads on your component from wetting is oxidation, cleaning the component will not help.

Consider trying a more active flux prior to soldering. Understand from your supplier the potential complications that may affect your process prior to using a new flux. For instance, different flux formulations have different cleaning requirements and ISO9000 certification may have process change requirements.

If using a different, more active flux doesn't help, investigate a lead tinning service [ie, Murrietta Circuits - murrietta.com, Tintronics - tintronics.com, CTS Lead Tinning Services - componenttinningservices.com, etc]

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