Los Angeles City Structural Welding Code – Steel (D1.1) Certification Practice Test 2026 - Free Welding Certification Practice Questions and Study Guide

Flux-Cored Arc Welding (FCAW) typically utilizes constant voltage power supplies. This is because FCAW involves a continuously fed tubular wire electrode that melts and deposits filler material into the weld joint. The use of a constant voltage power supply allows for a stable arc length, which is crucial for maintaining a consistent and controllable weld pool.

When the voltage remains constant, any variations in the arc length caused by movement or other factors will result in changes to the current. This helps to stabilize the operation of the welding process and produces smoother welds. The nature of the FCAW process, along with the interaction of the electrode and the weld pool, makes constant voltage the preferred choice for achieving the best results in terms of penetration and bead appearance.

Understanding this principle is essential for those working with FCAW to ensure effective and high-quality welds.