The ITER fusion reactor features first wall panels, facing the fusion plasma, that comprise Be tiles, bonded to a CuCrZr heat sink. During bonding of these materials, residual stresses arise from their mismatch in thermal expansion properties. Their presence can be detrimental to component integrity, both by reducing structural strength and joint endurance in service. The experiment will therefore aim to experimentally quantify these stresses, assess different surface treatments used to accomodate them and understand changes following high heat flux exposure in service. Understanding of residual stresses, moreover the ability to control levels within the component, is of great importance in determining its structural integrity, which is key to the success of ITER.