UKERC EDC: Publications

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Abstract:

The principal aim of the project was to use advanced modelling and testing to extend the size range for which the HCM2S (P23) steel can be fabricated both with and without Pre-Weld Heat Treatment (PWHT). The specific objectives were:

To optimise the fabrication of thick section HCM2S utilising practical and efficient welding processes - Manual Metal Arc (MMA) and Flux Cored Arc Welding (FCAW).

To thoroughly investigate the welding of HCM2S without PWHT.

To model the weld and cross weld mechanical properties of HCM2S both with and without PWHT in order to define cross weld properties.

To demonstrate acceptable weldment mechanical properties.

Consequently to produce fabrication guidelines for thick section HCM2S both with and without PWHT.

This project involved the manufacture of a number of pipe butt welds between HCM2S (P23) and itself - both with and without PWHT, and also dissimilar joints with BS 3064 660 (CMV) and ASTM A 335 P91 respectively, both these alloys representing materials with which there has been identified a potential desirability to join with thick section P23.

It was concluded that acceptable strains were developed during the life of the thick P23 weld for the non-PWHT'd condition to make it a viable option.

This summary provides information on:

Objectives

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