What type of weld is typically used in structural applications requiring high strength?

In structural applications where high strength is a critical requirement, submerged arc welding is often the preferred method. This type of welding is characterized by its ability to produce deep weld penetration and a high deposition rate, which contributes to the strength and overall quality of the weld. The process involves melting the base materials and a continuously fed electrode under a blanket of granular flux, which protects the molten weld pool from contamination and oxidation.

The effectiveness of submerged arc welding in structural settings is further enhanced by its suitability for welding thick sections of steel, making it ideal for heavy construction, bridges, and structural frames that must withstand significant loads and stresses. The resulting welds are typically smoother and have less spatter compared to other welding methods, which aids in achieving strong, durable joints.

While methods like flux-cored arc welding and shielded metal arc welding also have applications in structural welding, they may not consistently deliver the same level of strength and penetration as submerged arc welding, especially in high-strength applications. Tack welds, on the other hand, are primarily used to temporarily hold components in place and are not intended to provide the structural integrity required for load-bearing applications.