Preface Effect of Magnesium and Silicon on Temperature and Mechanical Properties in Refill Friction Stir Spot Welding of Aluminum to Titanium Formation Mechanism of Dense and Uniform Structure during Tailor Welding of Aluminum Foam Structure Preform Welding Distortion Control in T-Joint Structure of Al-Sheets by Using Pre-Tension Microstructural Characterisations of Static Strain Ageing in C-Mn Steel Welds of the Secondary Circuit of Pressurized Water Reactors Creep Properties of P92 Pipe Weld after Annealing at 600 and 650°C Application of Electron Beam Welding in the Production of TEMPALOY AA1 and T92 Butt Joints of Pipes Assigned for the Energy Industry Evolution of Inclusions in Physically Simulated Heat-Affected Zones of a Weld Metal Used with a 500 MPa Offshore Steel Effect of Thermal Cycle Profile on Thermal Fatigue Life of Sn-3.0Ag-0.5Cu Solder Joints for Wafer-Level Chip Scale Package Degradation Behaviour of Sn-Ag-Cu Lead-Free Solder Joint with Electrolytic Ni Plated Electrode due to Electromigration.