What is a consequence of failing to properly preheat metal before cutting?

When metal is not properly preheated before cutting, one of the significant consequences is the possibility of warping the metal. Preheating serves to reduce the thermal stress that occurs when a high-speed oxyfuel cutting torch is applied to the workpiece. Without adequate preheating, the temperature difference between the areas being cut and the rest of the metal can lead to rapid temperature changes. This sudden fluctuation can cause the metal to expand and contract disproportionately, resulting in warping or distortion of the material.

Additionally, preheating helps to prepare the material, making it easier to achieve a clean cut and minimizing the potential for adverse effects such as impurities or unwanted reactions due to the immediate exposure to high heat. The emphasis on preheating is particularly critical in thicker materials or those with different compositions, where the thermal characteristics can vary significantly. This illustrates the importance of preheating in maintaining the integrity and quality of the cut while mitigating the risk of warping.