Cover Story

Alternative Methods for Determining Preheat and Interpass Temperatures

Preheating, maintaining interpass temperatures, and postheating, when needed, can consume considerable shop or field production time with costs for labor, fuel gases, and electricity. However, alternative methods for determining preheat requirements, when applied with today’s cleaner, lower-carbon steels and the use of H4 and H8 low-hydrogen filler metals, can easily achieve time and cost savings, as well as environmental benefits.