Effect of scale factor and residual welding stresses on fatigue crack growth rate

Comparison of influence of pulsed effects of magnetic and electric fields on stressed state of welded joints of aluminium alloy AMG6

“…It is connected with the fact that welding stresses negatively affect the fatigue limit of welded joint, increasing the rates of fatigue crack propagation [1,2]. In this case the tensile welding stresses at their interaction with corrosive-active environment are the main cause for brittle fracture of metal, i.e.…”

Redistribution of residual welding stresses in pulsed electromagnetic treatment

“…As a rule, the three aspects of an RWS effect are examined [1]: summation of these stresses and external load stresses, changes in average stresses and their influence on the crack propagation kinetics. If the RWS effect on static strength at normal temperatures is rather contradictory [2], under cyclic loading, especially under loading at small stresses, their effect is unambiguous and shows as a considerable decrease in a durability limit of the weld metal and as an increase in fatigue crack propagation rates [3,4]. Moreover, tensile RWS are the major reason of corrosion cracking, viz brittle fracture of the metal under the simultaneous action of corrosive media and mechanical stresses [2].…”