I just came across a Preve picture from another forum regarding Preve bad welding joints.

This picture was originally taken from a facebook (not my facebook).

Now I keep quiet, and you judge these welding joints by yourself.

Spot welding (RSW)[1] is a process in which contacting metal surfaces are joined by the heat obtained from resistance to electric current flow. Work-pieces are held together under pressure exerted by electrodes. Typically the sheets are in the 0.5 to 3 mm (0.020 to 0.12 in) thickness range. The process uses two shaped copper alloy electrodes to concentrate welding current into a small "spot" and to simultaneously clamp the sheets together. Forcing a large current through the spot will melt the metal and form the weld. The attractive feature of spot welding is a lot of energy can be delivered to the spot in a very short time (approximately ten milliseconds).[2] That permits the welding to occur without excessive heating to the rest of the sheet.

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Applications


Perhaps the most common application of spot welding is in the automobile manufacturing industry, where it is used almost universally to weld the sheet metal to form a car. Spot welders can also be completely automated, and many of the industrial robots found on assembly lines are spot welders (the other major use for robots being painting).

even got also not so UGLY like this la