Modelling miter welds along a pipeline

I'm currently performing a study to check the stresses in a fabricated expansion loop which has a 1.5° - 3° miter weld between two pipe joints.

I'll like to know how it should be modelled in AutoPIPE. Can it be, for example, a 1.5° deviation in the second pipe joint from the original alignment of the first pipe joint which causes a kink, or is there any other approach i'll have to consider?

Any advise is greatly appreciated.