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Welding history

Classification of welding

Effect of welding speed

Welding defects

Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

Welding techniques

Welding symbol

Welding edge preparation

Advantages of welding joints

Thermal properties of metal

Welding safety

Types of welds



Spot welding

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-

Advantages of spot welding-

Principle of spot welding diagram

spotwelding pic

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Spot welding process