Body Repair Manual

• Welding Strength Test
Even if you perform the welding in accordance with the conditions, the strength of the welded sections may fluctuate widely with
drops in the voltage and other factors. The quality of the welding cannot be evaluated unless the welded sections are destroyed.
Provide yourself with a steel plate of the same thickness and conduct a destruction test.
• If holes appear in the steel plates, this means that the
welding is standard strength.
• Drive a wedge between two panels near the nugget. If
the welded parts do not come apart and the diameter of
the nugget is more than 3mm (0.1 in), the welding
should be satisfactory.
30 mm
(1.2in)
WEDGE
Stop inserting the wedge when
the full size of the nugget appears.
NOTE:
It is difficult to perform spot welding in the following circumstances:
• When it is not possible to remove any rust or paint attached to the welding surfaces.
• When the tip of the spot welder cannot be inserted into the welding section.
• When the welding surfaces can be seen from the outside and welding will impair the exterior appearance.
In all these cases, the gas welding method should be employed. Moreover, if it is not possible to perform spot welding because of
space restrictions, plug welding using on the arc welding method may be performed instead. For plug welding, the sections to be
welded must be close together.
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