Welding Analysis with Element Birth/Death technique

Dear All Experts;

I have examined a welding analysis. I used Goldak's Double Ellipsoidal model in APDL for moving heat source in transient thermal analysis.

I imported the loads obtained in thermal analysis to structural analysis.

I divided the weld line with 10 parts, the length of part 100 mm, the speed of welding is 10 mm/sec. also the weld line was divided 10 parts every divided part's length is 10 mm. in the beginning all the parts are death and for every 1 sec I activated parts respectively.

My question is that when I compare the resulşt between structural analysis which was made with element birth/death texhnique and structural analysis without using element birth and death techique for the same imported loads there is a big difference.

I obtained 200 Mpa values with the structural analysis which is executed without using birth/dead technique and I obtained too much values like 1900 Mpa values with the structural analysis which is executed with using birth/death technique?,

Why do I obtain these different values with these structural analysis which the same boundary condition are used.

I did not use element birth and death technique for transient thermal analysis.

I thank you in advice.



Best regards...