Gravity welding process

 

Gravity welding process

Gravity welding is a type of Arc welding process wherein heat is obtained by an electric arc, between a long electrode and a job..

Preface 

Gravity welding could not expand much due to its complexity. The reduced length of the electrode and the difficulties of controlling the arc length have hindered the development and exploitation of suitable systems.

Working process of Gravity welding.

Gravity welding is an arc welding process in which electrodes of maximum size are fastened to an electrode holder, which can slide up and down a bar or rod held at a predetermined angle. The top of the electrode is located at the root of the joint. After the arc starts, the end of the electrode melts.

As the electrode shrinks, the holder bar slides down. Keeping the tip of the electrode with the joint. This weld is deposited until the electrode is lowered to about 50 mm, at which point the motion of the holder stops, and the arc is extinguished.

Again the fresh electrode is placed in the holder. The slider strip is moved along the joint, and the weld is restarted at the point at which the previous electrode was closed.

The successful operation of gravity welding depends on two factors. First, the electrode must have a flux that melts as a cone at the tip. While resting the outer edge of the flux cone on the plate in the joint, the arc length is controlled by the melting of the flow.

The second point is that the angle between the slider bar and the joint must match the melting rate of the electrode if the system is to be stable.

Definition of the Gravity welding process

The gravity welding process is an arc welding process wherein
heat is obtained by an electric arc, between a  long electrode and a job.

Advantages of Gravity welding

• Electrodes used in gravity welding are made over a larger length, leading to fewer electrode changes for a given run length than manual welding.
• The gravity welding process reduces the time it takes to convert electrodes, which is why it is slightly faster than the manual welding process.