[MW:21704] Is preheating requirement based on weld-metal or base metal

Dear Friends,

Kindly clarify whether preheating requirement is based on weld-metal or base metal.

I have a PQR with 36mm thk base metal 8mm GTAW & 10mm SMAW

WPS 

Base metal 5-36mm

Weldmetal: 20mm max.(SMAW)

Weldmetal 16mm max (GTAW) 

If I have to do10mm fillet weld with SMAW process for 10mm thk Skirt to Base metal 36mm corner joint, is preheating required?

Please provide your response with Code reference

Thank you in advance

Aly

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