1. What does mean of letter B in ASTM A106 Gr. B. 2.Pwht procedure for Alloy steel P22. 3 Essential variable, supplementary variable and non essential variables for WPS.

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B in ASTM A106 Gr. B stands for Grade B, indicating the minimum yield strength of the material.
PWHT procedure for Alloy Steel P22 involves heating the material to a specific temperature and holding it for a specific time to relieve residual stresses and improve toughness.
Essential variables for WPS include base material, filler material, welding process, thickness, and joint configuration.
Supplementary variables may include preheat temperature, interpass temperature, and post-weld heat treatment.
Non-essential variables may include welding position, backing gas, and electrode type.

1. What does mean of letter B in ASTM A106 Gr. B. 2.Pwht procedure for Alloy steel P22. 3 Essential variable, supplementary variable and non essential variables for WPS.

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