A process for post treatment of an imaging member belt including
providing a support member having a smooth flat surface,
providing a flexible belt having a welded seam,
supporting the inner surface of the seam on the smooth flat surface,
contacting the seam with a heated surface,
heating the seam region with the heated surface to raise the temperature in the seam region to a temperature of from about 2° C. to 20° C. above the Tg of the thermoplastic polymer material, and
compressing the seam with the heated surface with sufficient compression pressure to smooth out the seam.