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Fatigue of welded joints can occur when poorly made or highly stressed welded joints are subjected to cyclic loading.[1] Welding is a manufacturing method used to join various materials in order to form an assembly. During welding, joints are formed between two or more separate pieces of material which can introduce defects or residual stresses. Under cyclic loading these defects can grow a fatigue crack, causing the assembly to fail even if these cyclic stresses are low and smaller than the base material and weld filler material yield stress.[1] Hence, the fatigue strength of a welded joint does not correlate to the fatigue strength of the base material.[1] Incorporating design considerations in the development phase can reduce failures due to fatigue in welded joints.[2]
^Maddox, Stephen (January 2000). "Fatigue Design Rules for Welded Structures". Progress in Structural Engineering and Materials. 2 (1): 102–109. doi:10.1002/(SICI)1528-2716(200001/03)2:1<102::AID-PSE12>3.0.CO;2-A.
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