[modeleng] Re: Boilers
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 7 Jan 2006 11:00:36 -0800 (PST)
Questions from a NON-boiler maker (yet)!
Phill, the "Cutting Torches" I have worked around are
long, heavy and hard to control, most of them being at
least 18 inches in length and weighing several pounds.
Wouldn't this prove to be a handicap for an old
codger like me to have to manipulate this much
length/weight around during a long session?
Al Messer
--- Phill Smith <steam@xxxxxxxxxxxxxx> wrote:
> Harry,
>
> The problem with welding tips is that they are
> designed to give a high
> concentration of heat to a relatively small area.
> The cutting torch is
> designed to give relatively more heat (due to the
> greater number of preheat
> flames) but spread over a larger area. With the
> "rosebud" heating torch, it
> is an even larger version of the cutting torch, due
> to it's much larger
> number of flames. But the advantage of the cutting
> torch is that you have
> the control (to some extent) of the welding tip,
> combined with the broad
> heating capacity (a smaller version) of the rosebud
> heating torch. I have
> found it to be an excellent combination of heat
> output and controllability
> (is that a word???) in terms of being able to
> localise it for silver
> soldering individual bits and pieces without having
> to melt all the
> surrounding silver soldered joints.
>
> The only time I use my heating torches is for the
> preheat and holding the
> boiler at around 50-100°C below soldering temp. I
> then move in with the
> cutting torch and locally heat the areas that I
> intend on silver soldering.
> I only seem to use my LPG/oxy heating torches these
> days, and not my
> oxy/acet. As I don't work in a gas plant anymore, I
> found that operating
> costs is a major factor...... The free stuff has
> stopped flowing.........
> *sigh*
>
> Cheers,
>
> Phill.
>
> ----- Original Message -----
> From: "Harry Wade" <hww@xxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Saturday, January 07, 2006 10:39 PM
> Subject: [modeleng] Re: Boilers
>
>
> > At 11:04 PM 1/7/06 +0800, you wrote:
> > >Use the oxy/acet cutting torch for your local
> heating for silver
> braising,
> > >rather than a welding tip. - Phill
> >
> > Phill,
> > We all generally (or should) recognize that
> when using any oxy/acetyl
> > torch device around copper boilers that careful
> handling is needed to
> avoid
> > localized overheating, or overheating in general.
> Does your suggestion
> not
> > jump from the frying pan into the fire? I am not
> an expert on the heating
> > characteristics of oxy/acetyl equipment but does
> not a cutting head
> > concentrate heat more so than any other tip?
> Except for small boilers,
> Ga1
> > and such, my preferred tip for oxy/acetyl use is a
> 1" diam "rosebud" which
> > produces a relatively broad flame and lessens the
> possibilty of
> overheating
> > and (gasp, choke) a meltdown or burn-through.
> >
> > Regards,
> > Harry
> >
> > MODEL ENGINEERING DISCUSSION LIST.
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> >
> >
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