We may earn revenue from the products available on this page and participate in affiliate programs. Learn More ›. Welding is a skilled trade with high demand and the potential for a rewarding career. A welder specializes in joining materials, typically metals or thermoplastics, using high heat to create a strong and permanent bond between the pieces. Welders play an important role in many industries, including construction, manufacturing, and shipbuilding, and can perform various types of repairs. Their work is essential for building and repairing bridges, ships, cars, and countless other products.