Abstract
This paper aims to study the effect of loading constant and variable
capacity on the fatigue resistance of carbon steel AISI 1020 which welded by
metal inert gas and comparing it with metal without welding process .
All the fatigue tests for constant capacity were done by rotating bending
of mean stress estimated to be zero. The test for variable capacity stress was done
at high-low stress, so the amount of high stress was near the maximum ultimate
tensile stress for metal before welding which is obtained from tensile test which
was done for the metal before and after welding. It has been found equal to 400
MPa for the metal without welding and 450 MPa for welding metal. Low stress
which is selected as percent from fatigue resistance for constant capacity stress
which is 10-15-20% from fatigue limit.
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