Then it was tested in a controlled chamber heated to 40 ◦C. To achieve this rating under the EN60974-1 standard, firstly the machine was ‘warmed up’ prior to testing by welding continuously to cause it to cut out on thermal overload at least twice. All Weldforce machines by Weldclass are tested to this standard.Īgain, take the example of the Weldforce WF-205MST with a duty cycle rating of 200A 30%. This standard is very demanding and is therefore considered to be the best indication of how a machine will perform in ‘real life’ conditions. The most widely accepted standard for testing and determining duty cycle ratings is the European Standard EN60974-1, on which the Australian standard AS60974-1 is based. (Testing a machine that is already hot is obviously much more demanding on its cooling system.)
Whether the test was with a 'fresh’, cold machine or a machine that was already warmed up from prolonged use.Ambient temperature in which the test was made (a higher ambient temperature is more demanding).Time period over which it is measured (generally 5 or 10 minutes – a 10minute period is more demanding).While the basic formula is always the same (% of "on" time within the test period), there are several variables which can influence the outcome of a duty cycle test, including: At lower amperages, the duty cycle will increase.įor example - if we look at the WF-205MST machine again At higher amperage output the machine will heat up more rapidly, and the duty cycle will reduce. The machine will then re-start when it returns to a safe temperature.ĭuty cycle will change at different amperages. For the remaining 7 minutes, the machine will switch to thermal overload to cool down.Īll welding machines are (or should be) fitted with thermal overload protection which means the machine will cut out when internal critical components reach a certain temperature, to prevent damage. This means that it will operate at 200A for 3 minutes within a 10 minute time period. For example the Weldforce WF-205MST multi-function welder has a duty cycle of 200 Amps 30%. Duty cycle is the percentage of time that a machine will safely operate (or weld), within a certain time period, at a given amperage.
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