What effect does rust have on welding?

Rust can significantly affect welding processes, primarily by contaminating the weld area. When performing welding, the presence of rust, which is primarily composed of iron oxide, can lead to issues such as poor adhesion between the base metal and the filler material, compromised mechanical properties of the weld, and potential for defects.

The high levels of impurities introduced by rust can cause a lack of fusion, which results in a weaker weld that may be more susceptible to cracking or failure under stress. Additionally, rust can create gas pockets or slag inclusions that further degrade the quality of the weld.

Therefore, ensuring that metal surfaces are clean and free from rust and other contaminants prior to welding is crucial for achieving a strong and reliable joint. This highlights the importance of proper preparation in welding to enhance the weld's integrity and performance.