This work is aimed at the fatigue strength prediction of laser welded joints in aluminium alloy containing defects through the examination of location, size and shape of the weld defects. Some published documents give guidance for this kind of fatigue assessment, in particular the British Standard PD 6493 (1991) and a document by the International Institute of Welding on fatigue of welded components (1995). The assessment procedures was applied to two series of laser butt welded joints made of 5 mm thick 5083 H321 aluminium alloy plates. The two series were obtained by using different parameters in the welding procedure. Each set of parameters introduces a large amount of flaws in the weld bead. The fatigue behaviour was experimentally determined by means of pulsating tension tests. The application of the assessment procedure, as proposed in the published documents, led to unsatisfactory results due to the excessive dimensions of the final design flaw. Theoretical predictions compatible with the experimental results were obtained by modifying the criterion adopted to measure the flaw dimensions
Defects influence on fatigue behaviour of laser welded joints
LIVIERI, Paolo;TOVO, Roberto;
2001
Abstract
This work is aimed at the fatigue strength prediction of laser welded joints in aluminium alloy containing defects through the examination of location, size and shape of the weld defects. Some published documents give guidance for this kind of fatigue assessment, in particular the British Standard PD 6493 (1991) and a document by the International Institute of Welding on fatigue of welded components (1995). The assessment procedures was applied to two series of laser butt welded joints made of 5 mm thick 5083 H321 aluminium alloy plates. The two series were obtained by using different parameters in the welding procedure. Each set of parameters introduces a large amount of flaws in the weld bead. The fatigue behaviour was experimentally determined by means of pulsating tension tests. The application of the assessment procedure, as proposed in the published documents, led to unsatisfactory results due to the excessive dimensions of the final design flaw. Theoretical predictions compatible with the experimental results were obtained by modifying the criterion adopted to measure the flaw dimensionsI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
