Groups > sci.electronics.design > #453899

Re: tig hi freq

From	Bill Martin <wwm@wwmartin.net>
Newsgroups	sci.electronics.design
Subject	Re: tig hi freq
Date	2017-03-27 10:24 -0700
Organization	A noiseless patient Spider
Message-ID	<obbhn2$38b$1@dont-email.me> (permalink)
References	<obb6u4$gih$1@reader1.panix.com> <bf78654d-4502-4e0a-be8a-bac067df9ebc@googlegroups.com> <obbdr4$co5$1@reader1.panix.com> <9f289319-355f-44af-b68f-c2cf1c6eac93@googlegroups.com>

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On 03/27/2017 09:45 AM, Lasse Langwadt Christensen wrote:
> Den mandag den 27. marts 2017 kl. 18.15.37 UTC+2 skrev Hul Tytus:
>> George - thanks for looking. That article is about the frequency of the
>> current that provides the power for welding aluminum. Apparantly aluminum
>> can't be effectively welded with a dc current as is the case with steel.
>>    My present understanding for tig welding of steel is that a high
>> frequency low powered "starter" current establishes a low resistance
>> pathway for a high amperage dc current. It is this starter current that's
>> of interest and not the high amperage ac current used with aluminum.
>>
>
> negative electrode puts most of the heat into the part instead of the
> electrode but that doesn't work for aluminium because you need some
> current flow the other way to clean the metal.
>
> I don't think there is any specif frequency for HF start, it is just a high voltage at a frequency that can be coupled to the welding voltage to start
> an arc instead of having to scratch start
>
> there a diy versions made with old ignition coils
>
> https://hackadaycom.files.wordpress.com/2009/01/start_box.jpg
>
>
>
>
>
>
>
I looked for the rest of the article on Hackaday, but didn't find it. Do 
you happen to have a URL for it?
TIA,
Bill M

Thread

tig hi freq Hul Tytus <ht@panix.com> - 2017-03-27 14:17 +0000
  Re: tig hi freq George Herold <gherold@teachspin.com> - 2017-03-27 08:00 -0700
    Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-27 16:15 +0000
      Re: tig hi freq tabbypurr@gmail.com - 2017-03-27 09:40 -0700
      Re: tig hi freq Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-27 09:45 -0700
        Re: tig hi freq Bill Martin <wwm@wwmartin.net> - 2017-03-27 10:24 -0700
          Re: tig hi freq Neon John <no@never.com> - 2017-03-31 15:27 -0400
            Re: tig hi freq Bill Martin <wwm@wwmartin.net> - 2017-03-31 14:42 -0700
      Re: tig hi freq "dcaster@krl.org" <dcaster@krl.org> - 2017-03-27 11:22 -0700
      Re: tig hi freq George Herold <gherold@teachspin.com> - 2017-03-27 11:37 -0700
    Re: tig hi freq Neon John <no@never.com> - 2017-03-31 15:01 -0400
  Re: tig hi freq Tim Wescott <tim@seemywebsite.com> - 2017-03-27 12:19 -0500
    Re: tig hi freq "dcaster@krl.org" <dcaster@krl.org> - 2017-03-27 11:15 -0700
      Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-27 22:56 +0000
    Re: tig hi freq amdx <nojunk@knology.net> - 2017-03-27 14:54 -0500
    Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-27 22:55 +0000
  Re: tig hi freq Cursitor Doom <curd@notformail.com> - 2017-03-27 18:33 +0000
    Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-27 22:57 +0000
      Re: tig hi freq Chris Jones <lugnut808@spam.yahoo.com> - 2017-03-28 18:07 +1100
        Re: tig hi freq Neon John <no@never.com> - 2017-03-31 15:50 -0400
  Re: tig hi freq Jon Elson <jmelson@wustl.edu> - 2017-03-27 14:02 -0500
    Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-27 23:07 +0000
      Re: tig hi freq Jon Elson <jmelson@wustl.edu> - 2017-03-28 13:51 -0500
        Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-28 22:04 +0000
          Re: tig hi freq sroberts6328@gmail.com - 2017-03-29 06:55 -0700
            Re: tig hi freq sroberts6328@gmail.com - 2017-03-29 07:01 -0700
              Re: tig hi freq sroberts6328@gmail.com - 2017-03-29 07:15 -0700
                Re: tig hi freq Hul Tytus <ht@panix.com> - 2017-03-29 15:05 +0000
    Re: tig hi freq Neon John <no@never.com> - 2017-03-31 15:35 -0400

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