Welding - Measurement of preheating temperature, interpass temperature and preheat maintenance temperature (ISO 13916:2025)

This standard establishes the methodological framework for measuring key thermal parameters during the welding process, specifically focusing on preheating temperature, interpass temperature, and the maintenance of preheat conditions. It provides detailed procedures and requirements to ensure accurate monitoring of these temperatures, which are critical factors in determining the quality and integrity of welded joints. The document outlines the necessary instrumentation, measurement techniques, and data recording protocols to be employed by practitioners. By adhering to the specified guidelines, the standard aims to promote consistency in thermal management practices across various welding applications. It serves as a technical reference for operators and quality control personnel to verify that thermal parameters remain within the prescribed limits required for specific materials and joint configurations. The content is designed to support the execution of welding operations under controlled thermal conditions, facilitating the achievement of desired metallurgical and mechanical properties in the final welded structure without altering the inherent characteristics of the base materials or filler metals.