railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Joining Welding

Which of the following is true for TIG welding with DCEN polarity?

1
30% heat is generated at the workpiece
2
90% heat is generated at the workpiece
3
10% heat is generated at the workpiece
4
66% heat is generated at the workpiece
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