Solid-state welding

Solid-state welding

In this process, the workpiece is not melted.

The material remains in solid state due to the absence of a melting temperature.

The heat-affected zone is very small as compared to the fusion process.

Similar material can be joined non-conductive material like plastic can be joined. 

There are two categories of solid-state welding 

category 1 

The welding process in which the workpiece is not heated by using any direct source of heat 

Example- explosive welding friction welding ultrasonic welding 

category 2 

The welding process in which the workpiece is heated by using a direct source of heat.

Example- diffusion welding and Forge welding

Explosive welding 

the practical application of this process is to joining of two to more part along their surface through explosive welding

Flair plate and target plate are two workpieces to be joined the fixed plate is known as the target plate and the movable plate is known as a flair plate.

A calculated amount of explosive material is arranged over the Flair plate 

It is connected with the help of detonator 

During the burning of explosive material, a heavy trust produces over the player plate, as a result, the flat plate comes down and hits the target plate with very high impact velocity.

The impact velocities are so high that the molecule of one gets diffuse into another one another for welding due to molecular diffusion.

The Buffer plate usually made of rubber is provided between process material and Flat plate to protect the flat plate from the damaging effect of explosive material. stand-off distance is provided between a flat plate and tiger plate to generate the impact between two workpiece inclination angle is given to the flat plate in order to give the direction to the weld.

Friction welding-

The practical application of fusion welding in joining of two rod-shaped component.

This completed in 3 following steps-

Step 1- In the lathe that is a rotated at very high speed whereas the plate b is stationary.

Step 2-  Allowed to the contact with the rotating plate.

Step 3- When some amount of heat generated and the temperature increases at a particular value brake are applied to stop the rotation and a Heavy pressure is applied through water pressure through one material over another one.