I have had this question referred to me by our engineering department and I'm not sure how to answer it. They are wanting to weld A532 Class 3 type chrome alloy to A400 and A576 1045 to the A532 and our shop is a controlled environment. The question is: do we need to stick these parts in sand or a insulated box to slowly cool the parts to prevent thermal shock from happening, therefore causing cracking or is a conrolled enviroment enough. Also if he sand method is needed, what would be the duration that they would need to remain in the sand?

Thanks

TSchmidt

Preheat temperature - 600 - 800°C
Rate of heating shall be not more than 50°C/hour until 800°C
After welding, cooling shall be done in a closed furnace or cooling chamber at a rate not greater than 50°C/h.

Good Luck

Giovani Lopes