engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Joining Welding

TIG वेल्डन के लिए _____ गैस को सामान्यतया प्रयुक्त किया जाता हैI

1
एसीटिलीन
2
हाइड्रोजन 
3
आर्गन 
4
ये सभी 
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