[MW:1533] RE: 1518] Significance of HOT PASS

Dear Rafique,

 

I am a certified International Welding Technologist and perform often welding inspections but I never accept to weld root pass only and than stop welding for the night, especially for such small wall thickness and diameter welds.

In my opinion also the most regulations doesn’t accept such.

Your risk for getting cold cracking will become much higher if you do so even for such easy to weld material as A106 grade B. If you still accepted such than I propose NDT in front of welding and pre-heating up to 75 - 125°C in order to avoid any moisture being present on the weld surface because of previous cooling down.

 

Best Regards,

 

Herman Pieper

 

Pieper Quality Support and Inspection

Phone: +31 (0)521 380083

Fax:    +31 (0)84 7539225

Cell:    +31 (0)6 51691215

 

Chamber of Commerce North Netherlands 01136551

VAT NL128062150B01

 

--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---