What does the term 'high-low' refer to in welding?

The term 'high-low' in welding specifically refers to the differences in weld bead height. This condition can occur during the welding process when the weld bead is not uniformly deposited, leading to variations that can affect the overall quality and integrity of the weld. If the height of the weld bead varies significantly, it can create stress concentrations or lead to other defects, potentially compromising the strength and reliability of the welded joint.

Understanding this term is crucial for welders as it highlights the importance of maintaining consistent welding parameters and techniques to achieve uniform welds. It reflects the need for attention to detail in execution and can indicate the necessity for adjustments in travel speed, heat input, or other welding variables to ensure a smooth and even application of the filler material.