Spot welding
Spot welding joint is one type of electric resistance welding. Generally joining the sheet to sheet, sheet to rolled sections, wire to wire etc. by this spot weld process. The spot welding is very effectively, which can replace the rivet joints and is very speedy process, this spot welding machine does not need skilled operator, it can be operated by semi-skilled labour.
The principle of spot welding is shown in the bellow diagram. In this machine basically having a transformer core (T) which is having a primary winding (PW). This primary winding tapped at a number of points. The secondary winding (SW)
has the two ends of a circuit (C) which is connected two arms made of copper or bronze. Each side has a copper electrode, this electrode of spot welding produce the sufficient heat to fuse the joining metal. The lower arm is generally stationary and upper arm is movable (upward and downward). The technical terms are rocker arms or electrode arms. The electrodes of spot welding is cooled by water, the water is passing through the inter looped water line.
The essential factor of spot welding-
- The welding current.
- The time of current application.
- The pressure of electrodes.
- The shape or area of electrodes.
- The surface condition of welded material.
Principle of spot welding diagram
Advantages of spot welding-
- In this welding process is free from fumes and spatter.
- Generally it has nothing maintenance or no skilled persons are required for maintenance.
- No skilled persons are need to operate the spot welding.
- Welding cost is minimum.
Gas welding
Arc welding
Resistance welding
Solid state welding
Radiant energy welding
Thermo-chemical welding
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Resistance spot welding process
Spot weld
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