Red Seal Welder Practice Exam 2026 - Free Red Seal Welder Practice Questions and Study Guide

Interpass temperature refers specifically to the temperature of the weld metal between passes in multi-pass welding. Maintaining an appropriate interpass temperature is crucial because it influences the mechanical properties of the weld, such as its strength and toughness. If the interpass temperature is too low, it can lead to issues like incomplete fusion or poor penetration in subsequent passes. Conversely, if the interpass temperature is too high, it can negatively affect the microstructure of the weld metal, potentially leading to undesirable characteristics, such as reduced hardness or increased risk of cracks.

Options discussing ambient temperature, the welder’s exposure to heat, or the temperature of the welding rod do not accurately capture the concept of interpass temperature. Those factors are relevant to the broader welding process but are distinct from the thermal conditions of the weld itself between passes. Understanding interpass temperature is vital for achieving a high-quality weld in multi-pass applications.