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Question: During the welding process, the two metal pieces being joined are subject to extreme temperatures and can cause the crystalline structure of the metal to pass through various metallurgical phases. As a result, hardening (and embrittlement) of the metal can occur to varying degrees (usually dependent on carbon content). Heat treatment is designed to reduce the hardness in the heat-affected zone of the metals and increase ductility in these sections. Various pressure vessel codes contain the specifics regarding the procedures for post-weld heat treatment. Heat is usually held for one hour per inch of thickness of the metal. The temperature used is based on the "P-number" of the metals. P-numbers are assigned based on the chemical composition of the metals. Holding temperatures can range from 1100-1350 ?F (593-732 ?C).

Answer: Image result for What are Levels of RAID 0, 1, 5?
RAID 1 requires at least two physical disks. RAID 1+0: RAID 1+0, which is also called RAID 10, uses a combination of disk mirroring and disk striping. The data is normally mirrored first and then striped. Mirroring striped sets accomplishes the same task, but is less fault tolerant than striping mirror sets.

Image result for What are Levels of RAID 0, 1, 5?
RAID 1 requires at least two physical disks. RAID 1+0: RAID 1+0, which is also called RAID 10, uses a combination of disk mirroring and disk striping. The data is normally mirrored first and then striped. Mirroring striped sets accomplishes the same task, but is less fault tolerant than striping mirror sets. Source: CoolInterview.com

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