axial residual stress distribution in pipe

Hi every body
I study the residual stress derived from a circumferential weld on the end of a pipe and degree of freedom in the other end have been taken

but i have a problem in residual stress distribution along axis of pipe.

 its known that the axial stress at the end of constrainted end should be zero or little but mine is in order of 100 MPa while residual stress is 300 MPa.

can anybody give me a hint about whats the source of error

thanks