What is the term for placing a small weld at each end of a joint?

Tack welding is the term used to describe the process of placing a small weld at each end of a joint. This technique is essential in the preparation stage of a welding project as it temporarily holds the components together and helps maintain alignment during the main welding process. By using tack welds, a welder can ensure that the pieces do not move out of position when applying the final welds, which is crucial for the integrity and strength of the finished product. Tack welds are typically small and can be easily removed if necessary, making them a practical choice for adjustments before the full welding is performed.

The other options refer to different welding techniques that serve other purposes. Spot welding specifically involves welding two pieces of metal at a point, often used in manufacturing processes like assembling sheet metal. Fillet welding creates a weld at a right angle between two surfaces, while cap welding refers to the process of applying a layer of weld to cover or enhance a joint rather than merely holding parts together. Understanding the distinct functions of these approaches helps foster effective welding practices and techniques.