**Abstract**

Sheet metal is the frequently used component geometry in industries, and the joining of sheets is inevitable. There exist numerous conventional processes for joining sheet metals, but the diverse needs of today's industries necessitate further research into alternative joining technologies. Joining by forming methods to join similar and dissimilar sheet metals has a great potential to reach current industrial requirements. The process involves plastic deformation of at least one constituent part. Among several techniques that evolved in recent times, friction-based welding, impact welding, and roll bonding are the three solid-state welding methods, often known as joining by forming. The present chapter starts with a brief overview of the various aspects of joining sheet metals by forming methods. The working principle, procedure, and the consequences of the impact-based methods such as vapor foil actuator welding, electromagnetic welding, and laser impact welding, along with the roll bonding process are discussed.

**Keywords:** sheet metal, joining, forming, impact welding, roll bonding
