This paper deals with the dynamics and stability behavior of a welded pipe containing flowing
fluid having a small harmonic component superposed. The equation of motion was derived to
represent the motion of a welded pipe conveying a pulsatile flow using a tensioned Euler- Bernoulli
beam theory. The finite element analysis was used to simulate the harmonic motion of a welded pipe
conveying fluid. It was shown that welded pipes with clamped-clamped and clamped-pinned supports
are subject to a multitude of parametric instabilities in all their modes. Stability maps are presented for
parametric instabilities of welded pipe with clamped-clamped and clamped-pinned ends. It is found
that the extent of the instability regions increases with flow velocity for clamped-clamped and
clamped-pinned welded pipes. The most important consideration from a practical point of view is to
avoid the onset of parametric resonance.