open up a transformer

Discussion in 'General Electronics Chat' started by bug13, Jan 19, 2013.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    Hi guys

    Is there a way to crack this transformer up with breaking it? I want to re wind it. thanks

    [​IMG]

    edit: without breaking it
     
    Last edited: Jan 19, 2013
  2. absf

    Senior Member

    Dec 29, 2010
    1,490
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    Last time I used a heat gun and the plastic parts were all melted.

    [​IMG]

    Recently I used the de-soldering hot air gun and put a sheet of aluminium between the ferric part and the coils. It worked well. The tricky part is that you have to apply heat on both sides evenly or else the ferric would crack.

    May be someone with good chemistry knowledge knew what chemical to use to dissolve the glue.

    Allen
     
    Last edited: Jan 19, 2013
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  3. debe

    Well-Known Member

    Sep 21, 2010
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    I use a microwave oven & it works realy well & doesnt melt the plastic bobbin. The oven i use is an old one specificly for this purpose, as its hard on the magnetrons. Have replaced acouple of magnetrons for about 30 transformers. Magnetrons are free from other dumped microwave ovens which had other problems. I have a large supply of magnetrons from the local scrap yard.
     
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  4. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,669
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    That core looks like it is soldered/welded together? :confused:
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    As a tip. It is not recommended to reuse copper wire from transformer windings. In a new transformer application. The reason is that the insulation on the copper wire may crack up
     
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  6. Metalmann

    Active Member

    Dec 8, 2012
    700
    223

    Looks Tig welded.
     
  7. tinkerman

    Member

    Jul 22, 2012
    136
    34
    This transformer looks rather small so it's difficult to tell. Lots of the larger transformers like street light ballasts are welded and I've cut through the weld with a disc grinder, then rewelded it back together. Salvaged the 120 volt coil(s) added a secondary for a fairly large capacity battery charger.
     
  8. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    Are those glue stuff safe? I mean not poisonous? I don't have a spare microwave oven.
     
  9. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
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    Not welded together, I can cut some off with a utility knife easily, I just can't cut through it.
     
  10. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38

    Thanks for your idea, I used a toaster mini oven I have spare, 180 degree C, perfectly done.

    I removed the transformer as soon as the oven hit 180 degree C.

    Thanks
     
  11. debe

    Well-Known Member

    Sep 21, 2010
    946
    184
    Heres a picture of a few ive done & the old oven. It is hard on the magnetron. Here in Australia a basic oven new is $45. So there is no shortage of ovens thrown out with minor faults.
     
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