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Solder Pen instead of standard solder iron .? Answered

i had an idea about making a pen that writes solder not ink
i searched for it and i found that it has been made this year

but i'm thinking about making my own version
maybe of wood
link for the solder pen :
if you have an idea please share it here



Best Answer 6 years ago

That is only a conceptual rendering, I don't believe, if ever made, a model
can work as intended.   Pictures show this placing solder balls on a PCB.
That is a job better done by solder paste which needs less heat to re-flow.
Soldering requires heating two metals ( wire and pad ) so that solder can
be melted and form a eutectic joint between all.

I own the cold heat pictured below and it is able to do some soldering tasks
but cannot do all.
It works by electric heating the conductive metal between the conductive tip
probes ergo it cannot do some tiny soldering requirements. 
True, it does not hurt the skin on your phalanges 

coldheat-action.jpgColdheat Soldering-tip.png

How about a standard soldering iron with an angled drive motor mounted on the side that forces solder wire at the tip of the iron?

Or perhaps a derivative of a Plastruder(extrudes molten plastic)?

First type I worked on tech people were unhappy about the solder angle changing in relation to the tip feeder as it unrolled from a spool. The weight
was ok........ A

I was thinking about that. What if it was sent through a straight tube before hitting the tip?

Something will be learned after it is incorporated.

  1. Consider solder just at melt point, at the tip and then touching it to a room temperature PCB metal ( usually Cu with a flash coat ), the solder may immediately crystallize into a hard glop, in any case solder will not "wet" the pad.
  2. Now consider the tip is hot enough to heat the PCB pad to flow the solder, that means solder is melted throughout the red area and its combined liquid solder weight will cause a dribbling out of the nozzle before you ever reach the pad and any exposed solder left behind will oxidize ( even your excellent five core UK solder will ).
  3. What material is the tip and solder heating tube made of ?  The molten solder must not wet it ( maybe teflon ) but it cold flows even more when hot and the tip must be able to transfer heat on contact to a pad.
  4. How will you cool the finger contact points of a true heat unit ?
Having been involved in two engineering attempts to produce a single
handed soldering tools in my career,
I could go on about other looming difficulties ................  


i didn't think about these points before
and you are totally right
so after all it's just an idea
and somehow i hope to see it work after solving these problems somehow .
thanks to you all for your interest.

Good man Aessam.
Acknowledge the difficulties and continue undaunted to solve them is the
mark of a smart engineer.
If such a soldering tool can be produced, I will buy one from you.

Here is a hint, do away with heating a metallic mass. Use a laser to heat everything at the point of meeting between copper pad, component pin or wire
and the solder in a brief flurry of pulsed energy.


Good idea but the problem is that in my country there isn't high power lasers for burning use
also trying to make something like that in my house would be very dangerous
but i have searched for this idea (laser soldering)
i found that there is a 30W Laser system used in industry that can do that

and i found a great idea here on instructables that can be the key for this
here he used a 1W laser
but he said that it can't melt metals
maybe it would work for Solder.
Using your idea and that device,i think it would work.
thanks again for your interest

You could mess with a doctor taking an X-ray!

Rick, as to why: For drawing circuits. Most often, this is done by applying either conductive inks or inks which become conductive once they have been baked in an oven to remove the carrier. I researched purchase of a unit back in the 1990s but it was far too expensive for our budget, and in fact impractical for our use.

The problem for using this as a true soldering pen is that you need the items that will be soldered to be "at temperature" for the solder to bond them. Aside from that, it's an interesting idea, on par with a MIG unit with auto wire feed.

yes, it's Really an interesting idea
even it won't work properly
but i hope that it can be developed to work perfect
and maybe it would be soldering future
thanks for your interest