Question: Adding oxygen to the shielding gas mixture: (Multiple Choice) Question 35 options: a) improves arc characteristics and reduces the surface tension of the weld pool.

Adding oxygen to the shielding gas mixture: (Multiple Choice) Question 35 options: a) improves arc characteristics and reduces the surface tension of the weld pool. b) lowers the heat input, weld penetration and edge wetting. c) must be over 5% of the gas mixture. d) creates excessive spatter

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