Free online courseFundamental of welding

Course Description

Welding is one of the most widely used fabrication technologies across manufacturing, construction, automotive, energy, shipbuilding, and repair work. This free online course helps you develop a strong foundation in welding science and technology so you can understand what happens in the arc, choose suitable processes, and communicate requirements clearly on the shop floor or in an engineering setting. Instead of treating welding as a set of isolated tricks, you will learn the underlying principles that influence quality, safety, and repeatability.

You will explore how welding is classified, how joints are designed and identified, and why details such as the root of a joint matter for strength and penetration. The course also builds fluency with welding symbols, a crucial skill for reading drawings and translating specifications into real welds. As you progress, you will connect theory to practice through the behavior of welding power sources, including key characteristics needed for different methods and how current and voltage relate to arc performance.

A major focus is the physics that drives arc welding outcomes. You will study arc initiation, arc stability, and issues such as arc blow, then move into metal transfer and the forces that affect droplet detachment and deposition. Understanding how arc length, melting rate, and efficiency influence bead formation will help you make better decisions when parameters change, materials vary, or defects appear. The course also introduces core processes used in industry, including oxy-fuel welding and common arc welding methods, providing a conceptual map of when and why each process is used.

To support real-world competence, the learning path includes short exercises that check understanding of essential concepts and typical ranges used in equipment. You will finish with a practical perspective on welding defects and inspection, improving your ability to recognize quality problems early and speak the same technical language as inspectors, welders, and supervisors. Whether you are starting a skilled trade pathway or strengthening professional skills for production and maintenance environments, this course gives you the fundamentals needed to progress confidently.