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

गैस वेल्डन त्रुटि का नाम बताएँ।

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संरध्रता
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वायु-छिद्र
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ऑक्सीकृत वेल्ड
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अपूर्ण भेदन
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