What does the term "tack weld" refer to in AWS D1.1?

The term "tack weld" in AWS D1.1 refers specifically to temporary welds used to secure components during the assembly of a welded structure. These welds are crucial in maintaining the alignment and positioning of parts before the final welding process is conducted. Tack welds help ensure that components do not shift out of place, thereby facilitating a more efficient and accurate final weld.

In many cases, tack welds are used to anchor larger pieces or assemblies, providing stability while the welder performs additional operations, such as completing the main welds. Once the final welds are completed, tack welds may be removed or incorporated into the final structure, depending on the design and requirements.

Understanding the purpose and application of tack welds is important for welders and fabricators, as these temporary connections play a key role in the overall quality and integrity of the welded assembly.