सर CVT मे मेन्स input voltage 235v होने पर output 213v आ रहा और जब जनरेटर input voltage 245v होने पर 224v आ रहा है जबकि नेमप्लेट पर 220v काॅंस्टंट लिखा गया है इसका करता कारण है
welding machine doesn't required stable voltage or stablizer for routine functions. It is in general heavy load and may damage CVT by high current drawn and in switching over voltages.
magnetic core has non linear characteristic. In linear elements we have proportional relations and mathematical circuit models but the same is not possible with non linear components. Here in underloaded conditions core remain saturated and give under voltage output. Check over voltage operation of CVT in video, it may clear your doubt.