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heat input & cooling rate

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INSP79

INSP79

Mechanical
Joined
Nov 2, 2016
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in AWS and ASME sec IX says that if heat input increase ,the cooling rate decrease .
my question how can i produce slow cooling rate to keep the weld material in perlite phase where it must increasing heat input to do that (by understanding from above reverse proportion
 
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Addition of preheat with heating pads.
 
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HEAT RETENTION BLANKET

use of these blanket as soon as finish welding to reduce the cooling time , the pearlite structure requirements can be achievable..
 
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Sorry but my question was in reverse proportion between heat input and cooling rate, were all them should keep in lowest.!!!
 
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