Why should hands and gloves be clean and oil-free during welding?

Keeping hands and gloves clean and oil-free during welding is crucial to prevent contamination of the base metal or filler rod. When welding, any contaminants such as grease, oil, or dirt can directly affect the quality of the weld by introducing impurities that may lead to defects, weaken the joint, or cause porosity. These contaminants can interfere with the proper fusion of the metals being joined, ultimately impacting the structural integrity and performance of the weld.

In the context of GTAW, where a precise and clean heat input is essential, ensuring that the surface being welded is free from any contaminating substances allows for better penetration and a more uniform weld. Therefore, maintaining clean hands and gloves plays a vital role in achieving high-quality welds.