Spot welding refers to a welding method that uses columnar electrodes to form a welding spot between the contact surfaces of two overlapping workpieces. In spot welding, the workpiece is pressed and closely contacted, and then the current is turned on, and the contact part of the workpiece is melted under the action of resistance heat, and a solder joint is formed after cooling.

Spot welding is mainly used for welding stamping parts of thin plate components with thickness less than 4mm, especially for welding automobile bodies, carriages and aircraft fuselage. However, containers with sealing requirements cannot be welded.

Spot welding skills:

1, foot method, the pedal can skillfully control the welding head to move up and down at various speeds, pause and apply force.

2, technique, hands can be very dexterous to move the control product.

3, eyesight, accurately determine whether the line is correctly pressed on the pad, and accurately remember the placement point of the welding head.

Extended data:

Points for attention in spot welding:

1, surface cleaning work, the surface of stainless steel plate must be cleaned before welding, and there can be no impurities, oil stains and oxide layers; These will affect the aesthetic effect of solder joints.

2, electrode pressure, electrode pressure during welding, is determined according to the thickness of stainless steel plate; The thin plate adopts smaller electrode pressure; Thick plates need large electrode pressure to make full contact between plates, and the adjustment of electrode pressure should be coordinated with the adjustment of welding time and welding current.

3, welding time, according to the different requirements of solder joints, the adjustment of welding time is also different, the welding time of power frequency AC resistance welding machine is calculated according to frequency (frequency =0.02 seconds).

Reference: Baidu Encyclopedia-Spot welding