What is a fire hazard in arc welding primarily caused by?

In arc welding, a fire hazard is primarily caused by intense heat and sparks generated during the welding process. When an electric arc is created between the electrode and the workpiece, it produces extremely high temperatures that can ignite flammable materials in the vicinity. The process also releases sparks and spatter, which can travel considerable distances and potentially set off fires if they come into contact with combustible materials such as paper, wood, or flammable liquids.

Understanding this aspect of welding safety is crucial because it highlights the importance of maintaining a clean and controlled workspace, free from any materials that could catch fire. It also emphasizes the need for proper personal protective equipment and safety precautions to mitigate these hazards effectively.