Paper Title
Hybrid Forming for Branch Part of Steel Pipe by Burring and Ironing

In this paper, we first intend to introduce the pipes and their applications, then we introduce and analyze the critical speed of the pipes, at this critical speed, the stability of the pipe is lost and the pipe may fail . We also examine the effect of adding a vibrating adsorbent to the tube; we find that by adding one Vibrating absorber to the pipe can reduce the vibration domain of the pipe by about 70% and delay the critical velocity of the pipe. Keywords - Pipe, Critical Speed, Vibration Absorber