Engineering, Materials and Components

Which of the following statements is correct?

The heat-affected zone of a weld is a homogeneous structure.

In some areas of the weld heat-affected zone, grain size can be smaller than in the unaffected base metal.

The temperature in the heat-affected zone can sometimes exceed the temperature in the fusion zone.

Transverse cracks do not occur in the heat-affected zone.

The heat-affected zone experiences microstructural changes due to thermal cycling.