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Fatigue properties of laser‐beam weldments on high‐strength steels
Author(s) -
Ring Markus,
Dahl Winfried
Publication year - 1994
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199401202
Subject(s) - welding , materials science , fatigue limit , metallurgy , annealing (glass) , beam (structure) , stress (linguistics) , stress relief , laser beams , laser beam welding , laser , stress concentration , composite material , structural engineering , fracture mechanics , engineering , optics , linguistics , philosophy , physics
The intention of this investigation is to evaluate the behaviour of laser‐beam weldments under cyclic loading. The materials tested are several high‐strength steel plates with thicknesses of 7‐8 mm differing in chemical composition, delivery state and strength level. A number of S‐N curves was established not only for the as‐welded condition but also for the stress relieved and dressed state. It was found that the fatigue properties of laser‐beam welded joints are considerably better than those of weld seams produced by other methods. The increase in fatigue strength amounts to approximately 50%, neither depending on the material used nor on an additional stress‐relief annealing. By using the R1 MS notch stress model, the good behaviour of the weld seams can be entirely attributed to the favourable weld geometry.