Page 111 - Welding of Aluminium and its Alloys

96 The welding of aluminium and its alloys

cannot be done then thickening the component will reduce the stress expe-
rienced by the weld.The fatigue life of the weld can be improved by induc-
ing compressive stresses at the toe of the weld. Overstressing the joint or
hammer peening the weld toe will both do this, although great care needs
to be taken that an over-enthusiastic application of either technique does
not introduce defects. Dressing of the weld toes has been found to be an
effective method but, once again, over-enthusiastic grinding can reduce
rather than improve fatigue life. If the weld toes are ground this should be
carried out by fully trained personnel. Grinding should be performed trans-
verse to the weld toes in order that the grinding marks are parallel with the
principal stress.