This International Standard defines and specifies the characteristics of single-phase resistance welding equipment. It includes the information to appear on the equipment nameplate and specifies the test methods to be used to verify the com-pliance of the equipment with the requirements of this International Standard.
It is applicable to single-phase resistance welding machines, in-cluding all types of complete portable equipment11, for use under the following conditions :
a) altitude : in the absence of any information concerning the height above sea level at which the machine is intended for use in ordinary service, the altitude shall be assumed not to exceed 1 000 m;
b) temperature of the cooling medium : in the absence of any information to the contrary, it shall be assumed that, for water-cooled machines, the temperature of the cooling water does not exceed 30 °C at the inlet of the machine and, in the case of air-cooled machines, that none of the following limits are exceeded :
1) maximum ambient air temperature 40 °C,
2) daily average ambient air temperature 30 °C,
3) yearly average ambient air temperature 20 °C;
c) pressure of cooling water : in the absence of any information to the contrary, it shall be assumed that the pressure of the cooling water is not less than that which is necessary to supply the rated quantity of cooling water (see 2.3.5).
This International Standard does not apply to multi-spot welding machines, to transformers sold separately or to capacitor discharge or rectifier machines.