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This problem models a hot block sliding along a colder block. This is a way to model welding. The hot block is set at a fixed temperature to model a heat source. Explicit time integration is used for the structural calculations and implicit time integration is used for the thermal calculations. Implicit time integration is much more stable and, therefore, a larger thermal time step can be taken. A thermal-mechanical slide surface between the blocks is defined using *CONTACT_SURFACE_TO_SURFACE_THERMAL command.