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No todos los plásticos se pueden soldar, y algunos de ellos sueldan mejor que otros, pero la mayoría de los de uso habitual en el hogar sueldan bien. Es una lástima tirar a la basura algo que puede ser reparado con muy poco esfuerzo y sin costo. Además es poco amigable con el medio ambiente.
Muchas veces se puede utilizar algún adhesivo para solucionar una rotura en un plástico, y suele ser una buena solución. Yo les presento acá una alternativa gratis, ustedes deberán evaluar la conveniencia de usarla en cada caso particular.
Not all plastics can be weld, and some of them weld better than others, but most commonly used at home do it well. It is a pity to throw away something that can be repaired with little effort and no cost. It is also unfriendly to the environment.
Many times you can use some glue to fix a broken plastic, and is often a good solution. I am presenting here a free alternative, you should assess the appropriateness of use in each particular case.
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Como dije antes, es necesario evaluar si conviene usar un adhesivo o una soldadura. Eso dependerá de varios factores, entre los cuales no es menor el de la estética. La accesibilidad de la pieza a reparar también importa: si está dentro de un hueco difícil de acceder, tal vez lo mejor sea usar adhesivo. La robustez de la reparación también importa.
En mi caso, arreglaré una banqueta plástica, que presenta dos fracturas que obligan a descartarla o repararla. No me interesa demasiado la estética, porque la utilizaré principalmente en mi taller, pero sí la solidez de la reparación, porque es muy peligroso para una persona de mi edad estar parado sobre una banqueta que se desbarata súbitamente por la rotura de una pata.
La accesibilidad de la rotura era excelente, así que no dudé ni un segundo en inclinarme a usar soldadura plástica.
As I said before, it is necessary to evaluate whether to use an adhesive or welding. That depends on several factors, including not least of aesthetics. The accessibility of the repair piece also matters: if it is within a gap difficult to access, may be best to use adhesive. The strength of the repair also matters.
In my case, I will fix a plastic stool, having two fractures requiring disposal or repair. I'm not too interested in aesthetics, because I will use it mainly in my workshop, but the strength of the repair, because it is very dangerous for a person my age standing on a stool that suddenly breaks down by a broken leg.
The accessibility of the break was excellent, so I did not hesitate a second to myself to use plastic welding.
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finishing touch - acrylic nail product from any beauty supply or drugstore?
In Introduction I say "not all plastic can be welded", but you are right, is better to add "and some of them weld better than others". I will edit the instructable.
The use of the tin solder ensures you will not apply too heat, or at least greatly diminishes the possibility of that happening.
Many years ago my mother had a plastic water pitcher. It touched the corner of a hot electric fry pan and got a hole in the side. I used a soldering gun like you have and plastic from a bottle of dish washing soap to make a patch. It required several tweaks before I fixed every leak, but it worked for many years. It was very ugly, but she did not mind.
Maybe somebody among Instructables readers can contribute with an easy method to enhance the aesthetics of plastic welds... I tried using sandpaper, it is a little solution, but not fix the problem.
The staples idea, harking back to the methods used to repair pots, is a good one for strengthening the weld.
If you're careful, nylon line can be melted/welded by putting a match flame to it for no more than half-a-second or so (maybe not even that long). It won't look pretty, but as it's hidden away anyway, that won't matter.
I tried to weld the nylon line using the solder, but it is not easy. I will try your suggest.