I activated the Weld reduction factor,WI in configuration file and in input screen.
Arbitarly i set the value WI=0.5 to check the effect on allowble stress, but to my surprise all the results and allowbles stresses were same althought line is operating at 685 degreee Centrigrade.(Creep range).
Where is the impact of changing WI refected in output..(stresses and allowables)