API 570 - PI, WELDING

Welding Inspector & WPS (PART 5)

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PART 5: PRE-HEATING AND HEAT TREATMENT VARIABLES

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Normally, there’s no issue on this variable because almost the PWHT Heating devices are working in order with the correct set-up temperature range and monitoring/record system.

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QW 407.1 – The term of A1/A3 transformation in metallurgy will be explained at here

EXAMPLE OF AN PWHT PROCEDURE:

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THE ESSENTIAL CONTENTS IN THE PWHT RECORD
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THE PWHT CHART WILL BE READ AND EVALUATED AS PER THE ABOVE PROCEDURE

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