Preheat different thickness according to ASME 1

[LouisLac]

Hi, I would like to know what are tinkling about preheat 2 different thickness according to ASME section IX.

If I want to weld, for example, A516 gr 70 with one part 20 mm with 60 mm, I think we need to consider the thicker part for the preheating but in ASME section IX no specification about this.

What are you thinking?

I'm right?

Thank,

Louis

 

[metengr]

You are absolutely correct regarding preheat - the thicker material at the weld joint should be the guide for temperature and hold time.

 

[LouisLac]

Thank you for your answer but I looking forward an ASME interpretation if it's possible because I have a supplier that he don't understand my explanation about this issue. Our contract is based on ASME section VIII div. 1 and section IX.

If you have something about ASME explanation I will appreciate.

Thank

 

[metengr]

LouisLac;
The Code considers preheat as mandatory only when looking at exemptions for PWHT. Please review Nonmandatory
Appendix R "Preheating". In the Introduction and for specific material groups the recommended preheat is based on chemical composition and material thickness, which means thicker materials would require preheat.