This standard applies to the simple method for determining the A[weighted] sound power level of a sound source, that is, the A[weighted] sound level of the sound source is measured at a specified measuring point, and then the A[weighted] sound power is calculated class. This method is especially suitable for on-site measurement, without having to move the measured sound source into a special acoustic environment. This standard is the broadband, narrowband, discrete frequency and other steady-state noise radiated by all kinds of general-purpose arc welding machines. In addition to bursts with a repetition rate of less than 5 per second, it is also suitable for non-stationary noise sources. There is no limit to the volume of the sound source to be measured. For a sound source with a large size, the part of the main noise source should be selected for measurement. For the noise measurement of other types of electric welding equipment, this standard can be implemented by reference.