Weld design refers to the process of planning and specifying how two or more materials will be joined together using welding techniques. It involves selecting the appropriate type of weld, such as fillet welds or butt welds, and determining the necessary dimensions, materials, and welding methods to ensure a strong and durable connection. Effective weld design considers factors like the type of materials being joined, the expected loads and stresses, and the environment in which the weld will be used. Proper design helps prevent issues like cracking or distortion during the welding process, ensuring the integrity and longevity of the final product.