Re: [MW:24356] Impact Test & cooling Rate-Preheating (carbon steel)

When plate/Sheet are manufactured in mills, there will be fast cooling rate in lesser thickness compared to heavier thickness. But in welding, it is  reverse

On 22-Feb-2016 5:56 pm, "Mohd Siraj" <mohd52100@gmail.com> wrote:

Dear all,

Background: 

impact testing is more critical for less(low)thickness than higher thickness.

Reason  : 

fine grain form during fast cooling and course grain form during slow cooling.

Question is:

Preheating use to lower the cooling rate for higher thickness.

So lower the cooling rate means form the course grain,course grain lower the toughness.

Preheating contributing to lower the toughness?

 

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