A major significant change in fabrication/ welding of process piping was brought out by ASME B31.3 2014 addition Table 331.1.3 “Exemptions to Mandatory Postweld Heat Treatment” It now allowed for all carbon steel conforming to P- No1material group for all control Thickness and All weld type with exemption from Postweld heat treatment if a preheat of 95°C (200°F) is applied prior to welding on any nominal material thickness >25mm (1in). Similar exemptions are provided for P-No.3, P-No 4 group 1, and P-No. Group1. These exemptions required a closer scrutiny prior to adaptation. The review is an attempt to make end users aware of its significance.

Subject
Test methods, Materials, Piping, Tubes, Industries, Welding, Base metals, Steel, Carbon steel, Hardness, Heat treatment, Toughness, Residual stress
Keywords:
Brazing: a metal joining process wherein coalescence is produced by use of a nonferrous filler metal having a melting point above 427°C (800°F), but lower than that of the base metals being joined, Category “M” “D” and “High Pressure Fluid Services” as defined by ASME B31.3 Section 300.2 P-No.as defined in ASME Section IX QW 200.3, Control Thickness- thickness of weld as defined in ASME B31.3 Section 331
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2020
Association for Materials Protection and Performance (AMPP)
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