Solder paste for SMD hot air soldering

Discuss hardware related to the VESC such as the NRF nunchuk.
akira9a
Posts: 15
Joined: 23 Mar 2016, 13:00
Location: Paris

Solder paste for SMD hot air soldering

Postby akira9a » 25 Apr 2016, 10:18

Hi Guys,
I have already soldered some SMD components but with the traditionnal technique.
Now I have bought a hot air gun (for the VESC) and I am wondering what kind of solder paster to use.
What is you favorite stuff? ?

Thanks for your help,

Cheers,
Patrick

rew
Posts: 943
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.

Re: Solder paste for SMD hot air soldering

Postby rew » 26 Apr 2016, 08:52


akira9a
Posts: 15
Joined: 23 Mar 2016, 13:00
Location: Paris

Re: Solder paste for SMD hot air soldering

Postby akira9a » 26 Apr 2016, 14:35

Hi rew
Thank you for your help.
I see that this one is lead free.
Isn't it more difficult than lead solder paste for a rookie like me ?

rew
Posts: 943
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.

Re: Solder paste for SMD hot air soldering

Postby rew » 26 Apr 2016, 16:44

Sure.... But you asked for MY favorite stuff. :-)

I run my own company. I can't afford to be found putting lead in my products. So I have to buy the lead-free stuff. I have no choice.

I don't like soldering things onto PCBs with hot air. I always end up blowing components away. The exception is the VESC shunt resistors. Those I take off and put back on with the hot air. I try to notice the components nearby blowing away and putting them back if they do...

For occasional home use, isn't a hotplate better?

akira9a
Posts: 15
Joined: 23 Mar 2016, 13:00
Location: Paris

Re: Solder paste for SMD hot air soldering

Postby akira9a » 27 Apr 2016, 11:31

Sure.... But you asked for MY favorite stuff.


Fair enough :lol: :lol:
I guess I ll try with hot air first and if I can t do it, I ll think of reflow ...

rew
Posts: 943
Joined: 25 Mar 2016, 12:29
Location: Delft, Netherlands.

Re: Solder paste for SMD hot air soldering

Postby rew » 29 Apr 2016, 17:22

Maybe my "just answer the question" response was triggered by some guys on another forum. They ask questions like "I want to use this 7805 schematic for the mains. But I don't want to use a transformer.". They then get mad when you provide realiistic solutions like "use a transformer anyway", or "use a switching powersupply". So sometimes I'm in the "just answer the **** question" mode.... :-)

Anyway, With lower airflow, the "blowing away other components" should reduce. However, that also reduces the thermal capacity of the hot air gun. So now you're only slowly heating everything -> Maybe things are staying too hot for too long....

I suspect an LM5109 died on me yesterday due to overheating during soldering. (I replaced the fets "next door").


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