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  1. #1
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,440

    Thumbs up Soldering Hearth !

    Hi Guys,

    I've not posted anything about what I've been doing lately, so after a visit to the local scrap yard and spotting some very useful "Fire Blanket" ! Four foot wide and 12 foot long, a couple of pounds and its mine. I'd been toying with buying some lightweight fire bricks, and there was always a chance that the scrap yard might have some.

    15-08-2023-005.jpg 15-08-2023-006.jpg

    Its made from glass fiber with an aluminium foil backing, probably originally used for insulating and wrapping steam pipes. Its much thinner than I expected it to be, only 6 mm thick.

    15-08-2023-001.jpg 15-08-2023-002.jpg 15-08-2023-004.jpg 15-08-2023-003.jpg

    I had some 1.6 mm aluminium sheet, so I cut it up to make a four sided box, pop riveted together and then glued a strip of the fire blanket inside three of the sides, using an off cut layed in the bottom.

    15-08-2023-009.jpg 15-08-2023-008.jpg 15-08-2023-007.jpg

    I didn't take any pictures of cutting the aluminium side pieces, I just got a bit involved before I realised !

    I've not tested it yet but will soon hopefully it will do the job Ok.
    Best Regards:
    Baron J.

  2. #2
    Join Date
    May 2023
    Location
    Canberra, Nimmitabel
    Age
    72
    Posts
    144

    Default

    ...and you're sure it's fibreglass and not asbestos.

  3. #3
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,440

    Default

    ErrolFlynn,
    ...and you're sure it's fibreglass and not asbestos.
    Thanks for your concern !

    Yes 100% sure ! The fibres are loose flexible and hard at the edges, asbestos tends to be relatively soft fibres. Anyway the scrap yard wouldn't allow any asbestos product to be taken in let alone remain there, I've seen them turn away asbestos covered steam pipe.
    Best Regards:
    Baron J.

  4. #4
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,440

    Default

    Hi Guys,

    I got the job that I made the hearth for done !

    18-08-2023-002.jpg 18-08-2023-001.jpg

    The heat didn't stop the adhesive from smoking but at least the aluminium didn't get so hot that you couldn't pick it up. The job that I wanted to do was solder these two quite substantial pieces of bronze together. I put the in the lathe this morning to drill, ream and part off two 10 mm slices.
    Best Regards:
    Baron J.

  5. #5
    Join Date
    May 2023
    Location
    Canberra, Nimmitabel
    Age
    72
    Posts
    144

    Default

    This thread reminds me of an educational film I saw years ago. The subject was braizing.

    I was expecting to see an operator with an oxy-acetylene welding set, but not at all. I can't recall the materials being used, but the job was a small round shaft that was being braized to a flat bar. The rod was inserted and surrounded by chips of (presumably) braising rod (it seemed like a paste) and the whole assembly was placed into an oven. The chips melted, surrounded the rod and flowed into the gap between the rod and the bar. Job done.

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