What is the first weld called when welding pipes with beveled edges?

The first weld made when welding pipes with beveled edges is called the "root pass." This initial weld is crucial as it establishes the foundation for the joint, ensuring proper penetration and fusion between the two pipe edges. The root pass is typically performed with a smaller electrode and lower heat settings to control the weld pool and prevent burn-through. Subsequent passes, known as fill and cap passes, are added to complete the joint.