] [Thread] [Date] [Author]

["Harold Sprague" <spraguehope(--nospam--at)hotmail.com>]

Steve,
Guru?  ...maybe seasoned.

The only way you can determine carbon equivilence CE is to do an analysis.  
A spark test will do, but you need the CE in order to determine the preheat 
temperature.

The problem is the variability in the same section.  This steel was 
manufactured during a period in which the variability in the chemistry was 
problematic.  If the weld does not crack upon cooling and it is relatively 
ductile, there should not be a problem.

Tide has some of the best topics on the topic, but he does not address the 
variability in a given section.

Regards,
Harold Sprague





> From: "S. Gordin" <mailbox(--nospam--at)sgeconsulting.com>
> Reply-To: <seaint(--nospam--at)seaint.org>
> To: <seaint(--nospam--at)seaint.org>
> Subject: Re: Welding to Old Steel
> Date: Mon, 17 Oct 2005 20:07:33 -0700
>
> Chris,
>
> This is how it sounds to me, too.
> I would be particularly concerned about the long-term and dynamic effects.
>
> However, before jumping to any conclusions, I would rather wait for the 
> response from Bob Garner describing his experience with structural-quality 
> welding of unidentified steel rebars and cast iron.
>
> This topic comes up quite often, so it would be great to hear the opinion 
> of gurus like Harold Sprague, Duane Miller, and Charlie Carter.
>
> Steve Gordin SE
> Irvine CA
>
>
>
>
>
>   ----- Original Message -----
>   From: Christopher Wright
>   To: seaint(--nospam--at)seaint.org
>   Sent: Monday, October 17, 2005 7:29 PM
>   Subject: Re: Welding to Old Steel
>
>
>
>   On Oct 17, 2005, at 4:32 PM, Michael Hemstad wrote:
>
>   > The CM is not overly concerned because he says that almost any steel
>   > is weldable; it's just a matter of picking the right electrode.
>   >
>   > Sounds too good to be true. Any comments?
>   Simpleminded--way too simpleminded. I remember an ongoing argument in a
>   former life about whether a certain trade-named medium carbon steel
>   was weldable. If weldable only means you can melt it locally so that it
>   fuses with neighboring material for a while, then the stuff is
>   weldable. But in structural terms  weldable means that you can always
>   produce repeatably tough, strong welds under reasonable environmental
>   conditions with practical procedural controls with AWS-specified
>   consumables. For the particular instance of the trade-named medium
>   carbon steel the first definition was being fobbed off as synonymous
>   with the latter, which it isn't.
>
>   The notion that weldability is 'just a matter of picking the right
>   electrode' ignores so many significant variables that it's meaningless,
>   if not negligently meaningless.
>
>   Christopher Wright P.E. |"They couldn't hit an elephant at
>   chrisw(--nospam--at)skypoint.com   | this distance" (last words of Gen.
>   .......................................| John Sedgwick, Spotsylvania
>   1864)
>   http://www.skypoint.com/~chrisw/
>
>
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