Qualifying Two Test Processes on One Plate

AWS D1.1 2015
Can I qualify two welding processes on one test plate?

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Yes, you can do on the product weld. But deletion of any process shall be required to requialification.
Read more: Qualification of Multiple Welding Processes (AWS D1.1)

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Do I use the deposited weld metal thickness for each weld process?

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No, you may be confused another code ASME IX QW-450.

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