[MW:21201] QW 406 , preheat maintenance

   Dear sir
               thickness and  OD : 323 od* 70 mm thk
               welding process : GTAW+SMAW
               Material : SA106 Gr B
               Preheating : 100 deg c
               weld deposition : for GTAW : 4 mm, SMAW : 66 mm


   Question  :
                  1) Is the preheat maintenance (post heating ) is required for  above material
                  2) If YES, what is time and temp  plz send the back up
    

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