What does the term "deformation" imply with respect to welded joints?

The term "deformation" in the context of welded joints specifically refers to any permanent change in shape or size of the joint. During the welding process, heat is applied, causing the materials to be joined to undergo physical changes. When the welded material cools, any alterations in its shape or size that occur as a result of the welding process can lead to permanent deformation. This is crucial to understand as deformation can affect the mechanical properties of the welded joint and its overall strength and performance in a structure. Recognizing that deformation implies a lasting alteration is vital for welding practices, as it influences design considerations and quality control in fabrication.