Laser for welding small plastic pieces?

Discussion in 'Project Construction Technologies' started by primuspaul, Apr 30, 2018.

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  1. primuspaul

    primuspaul

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    Is it possible to use one of those lasers to weld small plastic pieces together? What sort of power am I looking for? Any good website (one that gives accurate power readings) for lasers?
     
    primuspaul, Apr 30, 2018
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  2. primuspaul

    primuspaul

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  3. primuspaul

    kellys_eye

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    Sure you want to weld? Have you tried using the appropriate solvents first?

    The process of welding means bringing both surfaces to the same temperature and then adding a 'filler' material to make/strengthen the joint. A laser might get the two surfaces to similar temperatures (assuming it has sufficient power and doesn't just burn the material away) but adding the 'filler' may complicate issues somewhat.

    This is your second post re plastic welding. Is there a particular issue you're having with something or are you looking to develop a new method?

    If plastic welding was a particular requirement then it's usually already covered by some application already - vinyl jointing as mentioned in the other post for example. I know that perspex is joined using solvent and that ultrasonics are often used to 'glue' plastics together (probably the simplest solution) but each material generally has it's own method and there is no 'catch-all' machine for it.
     
    Last edited: Apr 30, 2018
    kellys_eye, Apr 30, 2018
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  4. primuspaul

    davenn Moderator

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    1W enough to weld plastic .... I seriously doubt it


    agree with the above :)
     
    davenn, Apr 30, 2018
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  5. primuspaul

    bushtech

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    bushtech, Apr 30, 2018
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  6. primuspaul

    WHONOES

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    If you have a particular problem gluing certain plastics, try contacting a manufacturer like Loctite for a solution. In my experience they are very helpful (they want you to buy their product after all).
    Some years ago I had a problem trying to glue some acrylic parts, in a production environment, which are notoriously difficult and Loctite thankfully had a solution.
    If not as someone else mentioned, ultrasonic welding is commonly used but is probably out of your reach.
     
    WHONOES, Apr 30, 2018
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  7. primuspaul

    primuspaul

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    Mostly for fixing handheld electronics. Welding produces an unmatched bond strength and is instant. No glue does this. You either use solvents for strength but it takes time or use hot glue and take a chance with the weak strength and poor heat resistance.

    I believe I've seen someone weld plastic with a 500mw laser. I just need to know if that laser advertised is realistically speced.

    Soldering iron welding requires touching of the joint which moves it out of place. Forced air is too broad and often deforms the entire plastic case so it won't snap together.
     
    primuspaul, Apr 30, 2018
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  8. primuspaul

    Hopup

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    I would recommend staying away from powerful lasers for this application, you need only one reflection form metal surface and it will probably go through any safety glasses you might have.
     
    Hopup, Apr 30, 2018
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  9. primuspaul

    primuspaul

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    They sell laser safety glasses for that.
     
    primuspaul, Apr 30, 2018
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  10. primuspaul

    hevans1944 Hop - AC8NS

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    Ah! But can you afford to buy a pair for the wavelength you choose?
     
    hevans1944, Apr 30, 2018
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  11. primuspaul

    primuspaul

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    primuspaul, Apr 30, 2018
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  12. primuspaul

    davenn Moderator

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    hahaha .... and if you have a laser strong enough to melt plastic to weld it.....
    what do you think it's going to do with those plastic safety glasses !!


    time to close this thread

    you have no idea what you are doing and the VERY dangerous aspect of hi power lasers


    Dave
     
    Last edited: Apr 30, 2018
    davenn, Apr 30, 2018
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