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Thread: Brazing welding alum

  1. #1
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    Default Brazing welding alum

    I was thinking it should be possible to work alum with an IR laser bar by putting a laser cutter xy in a bag of argon. Does this sound feasible? Just want to make aluminum boxes. I’m thinking of making an xy plotter and mounting a 50w IR bar. Really unsure on wavelength power and focusing.

  2. #2
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    ... a good methode to get a round spot out of a bar diode is to place fibers on every emitter and bundle them - here a coherent 25W-diode with a bundled "emitter-diameter" of around 0,7mm:

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    But the smaller single-module 9Watt-diode at the bottom, with an "emitter-diameter" of only 0,1mm, has a much better focussing, so higher energy density too!


    Here another 25Watt-diode with three single emitters, knife-edge-kombined, with the same 0,1mm-fiber:

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    This types with 0.1mm-fiber can be found with output-powers of up to 150 Watts!


    ---
    Look here, where I'm posting some of my "diode-worx" - http://photonlexicon.com/forums/show...Watt-IR-diodes

    I'm actually testing with a 30Watt-diode, but have enough of them, to combine with more than 1kW of averaged power, if in need for "serious laser power"

    Viktor

  3. #3
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    So 9 watts of what wavelength will let me weld alum? I had thought to need much more power. This is 3-5mm stuff

  4. #4
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    ... no, 9Watts won't be enough

    Made some tests with solder paste on 0.2mm brass sheets - here it starts at roughly 15Watts with my 975nm-diodes ... and burns away the pads on PCB's, if excessive heated!

    For 5mm aluminium i'll expect minimum power of above 60 Watts on a spot of 0.5mm diameter to start with, and maybe above 100 Watts CW to get it fused reliable.

    For this was may remark about the 150Watt-diodes with an attached 105µm fiber meant.

    ---
    You can sum up the power of several diodes, like in my "6x 445nm head" - but replace the blue diodes by the NIR-diodes focussing heads:

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    Viktor

  5. #5
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    ... this was meant for brazing! - for welding I'll expect more like 200-300 Watts min CW-power ...

  6. #6
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    I think I’ll move on. That’s way to much work and way to dangerous power to mess with. I’ll find premade boxes and buy them.

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