From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Radiator - A/C Evaporator core welding
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
References: <list-1245140@logan.com>
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Date: Mon, 22 Feb 2021 21:44:21 -0500
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Barry said the high frequency on his welder stopped working. I offered 
to fix it in exchange for him doing the welds. Non-committal answer. The 
three Crook brothers are retired with a big R.

Finn

On 2/22/2021 6:25 PM, Charlie England ceengland7@gmail.com wrote:
> https://www.alumiweld.com/
> is one brand, but most local welding shops will carry some version of 
> the stuff. I used it to braze my intake tubes to  1/4" plate, but I 
> have no idea whether it will stand up to the intake pulses & vibration 
> with the engine running. I can tell you that the stuff isn't the 
> magically easy to use stickum that it seems to be, when you're 
> watching the carnival barker at SNF The stuff I used was marginal on 
> thick stuff with a propane torch (might not be a factor with the heat 
> exchanger). You'll almost certainly need a wood handled stainless 
> steel brush to free the corrosion on the base metal while the torch is 
> applied to the molten brazing material.
>
> Have you thought about hitting Barry up to take a look at it? ;-)
>
> Charlie
>
> On Mon, Feb 22, 2021 at 3:04 PM Finn Lassen finn.lassen@verizon.net 
> <mailto:finn.lassen@verizon.net> <flyrotary@lancaironline.net 
> <mailto:flyrotary@lancaironline.net>> wrote:
>
>     Some time ago Ed Anderson recommended some (rather expensive) DIY
>     alum
>     welding or brazing rods that he had good success with.
>
>     I really need to add some alum tubing to the ends of the
>     evaporator core
>     tanks (and close off the existing tubes going into the tank sides).
>
>     I'm worried that If I try to do that myself that I will disturb
>     (weaken)
>     the existing core brazing/welds.
>
>     I assume that if I take them to a (Tig?) welder he'll be able to
>     do it
>     so heat won't spread (or maybe submerged in water)?
>
>     Any advice?
>
>     BTW, I'm now unable to find the exact same cores on eBay and would
>     rather avoid having to re-do the fiberglass inlet ducts. So I'll
>     have to
>     take the plane out of service to do it and to not mess up the cores.
>
>     Finn
>
>
>     ---
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>
>     --
>     Homepage: http://www.flyrotary.com/
>     Archive and UnSub:
>     http://maillancaironline.net:81/lists/flyrotary/List.html
>     <http://mail.lancaironline.net:81/lists/flyrotary/List.html>
>


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    <div class="moz-cite-prefix">Barry said the high frequency on his
      welder stopped working. I offered to fix it in exchange for him
      doing the welds. Non-committal answer. The three Crook brothers
      are retired with a big R.<br>
      <br>
      Finn <br>
      <br>
      On 2/22/2021 6:25 PM, Charlie England <a class="moz-txt-link-abbreviated" href="mailto:ceengland7@gmail.com">ceengland7@gmail.com</a> wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:list-1245140@logan.com">
      <meta http-equiv="content-type" content="text/html; charset=utf-8">
      <div dir="ltr">
        <div class="gmail_default" style="font-size:small"><a
            href="https://www.alumiweld.com/" moz-do-not-send="true">https://www.alumiweld.com/</a><br>
        </div>
        <div class="gmail_default" style="font-size:small">is one brand,
          but most local welding shops will carry some version of the
          stuff. I used it to braze my intake tubes to  1/4" plate, but
          I have no idea whether it will stand up to the intake pulses
          &amp; vibration with the engine running. I can tell you that
          the stuff isn't the magically easy to use stickum that it
          seems to be, when you're watching the carnival barker at SNF
          The stuff I used was marginal on thick stuff with a propane
          torch (might not be a factor with the heat exchanger). You'll
          almost certainly need a wood handled stainless steel brush to
          free the corrosion on the base metal while the torch is
          applied to the molten brazing material.<br>
        </div>
        <div class="gmail_default" style="font-size:small"><br>
        </div>
        <div class="gmail_default" style="font-size:small">Have you
          thought about hitting Barry up to take a look at it? ;-)</div>
        <div class="gmail_default" style="font-size:small"><br>
        </div>
        <div class="gmail_default" style="font-size:small">Charlie</div>
      </div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Mon, Feb 22, 2021 at 3:04
          PM Finn Lassen <a href="mailto:finn.lassen@verizon.net"
            moz-do-not-send="true">finn.lassen@verizon.net</a> &lt;<a
            href="mailto:flyrotary@lancaironline.net"
            moz-do-not-send="true">flyrotary@lancaironline.net</a>&gt;
          wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
          08ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Some
          time ago Ed Anderson recommended some (rather expensive) DIY
          alum <br>
          welding or brazing rods that he had good success with.<br>
          <br>
          I really need to add some alum tubing to the ends of the
          evaporator core <br>
          tanks (and close off the existing tubes going into the tank
          sides).<br>
          <br>
          I'm worried that If I try to do that myself that I will
          disturb (weaken) <br>
          the existing core brazing/welds.<br>
          <br>
          I assume that if I take them to a (Tig?) welder he'll be able
          to do it <br>
          so heat won't spread (or maybe submerged in water)?<br>
          <br>
          Any advice?<br>
          <br>
          BTW, I'm now unable to find the exact same cores on eBay and
          would <br>
          rather avoid having to re-do the fiberglass inlet ducts. So
          I'll have to <br>
          take the plane out of service to do it and to not mess up the
          cores.<br>
          <br>
          Finn<br>
          <br>
          <br>
          ---<br>
          This email has been checked for viruses by Avast antivirus
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          --<br>
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