Hello every one, I'm making a model to simulate heat transfer and thermal deformations at welding with a moving heat source through coupling heat transfer and solid mechanics. when i simulate heat transfer and the moving heat source only, the simulation runs very well but the problem is when i couple it with solid mechanics the moving heat source drifts and doesn't move in a straight forward line (welding direction). also, the moving heat source equation after simulation tells (inconsistent unit)

please, can any one tell me where is the problem? what am i missing? or what should i do to model this situation

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