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RE: Torch Cutting Steel

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The steel being cut is a low-alloy steel, A242 Grade 45.  The plates are
1 1/2 inches

What are the adverse effects on alloy steel?  Any special considerations
the type of steel involved and the thickness of the plates being cut?


> -----Original Message-----
> From:	hsprague(--nospam--at) [mailto:hsprague(--nospam--at)] On Behalf Of
> hsprague(--nospam--at)
> Sent:	Thursday, June 25, 1998 10:54 AM
> To:	'seaoc(--nospam--at)'
> Subject:	RE: Torch Cutting Steel
> See below.
> Harold Sprague, PE
> Krawinkler, Luth & Assoc.
> 	-----Original Message-----
> 	From:	Serroels, Chris/SAC [SMTP:CSerroel(--nospam--at)]
> 	Sent:	Thursday, June 25, 1998 10:46 AM
> 	To:	'SEAOC'
> 	Subject:	Torch Cutting Steel
> 	I have a project where we are cutting off a portion of the
> bottom of a
> 	steel tower to install
> 	a taller bearing.  I am wondering what effect the torching will
> have on
> 	the steel that remains.
> 	Will the heat generated by torching have a detrimental effect?
> 	[Harold Sprague]  The heat will only have a very localized
> effect on normal carbon structural steel.  The only adverse effect is
> on heat treated or alloy steels.  Keep in mind that ox-acetylene
> cutting is a high temperature chemical reaction, and not a melting
> process.  As opposed to air-arc or plasma arc.
> 	Other engineers have suggested that during torching the only
> significant
> 	heat generation
> 	occurs when burning the initial hole.  Once the cut is initiated
> the
> 	heat dissipates quickly.
> 	Is this an accurate assessment?
> 	[Harold Sprague]  Yes.
> 	What other options exist?  I heard of a method called
> air-arc'ing but am
> 	unfamiliar with it.
> 	[Harold Sprague]  Air arc is a process by which you use a carbon
> electrode and strike the arc and melt the metal.  Compressed air is
> blown on the molten metal clearing it from the cut. 
> 	Chris