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Arc Welding Starter Quiz 1

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Question 1

In Arc welding which of the following is Non- Consumable electrode

Question 2

In an arc welding process, the open circuit voltage is 200 V and the short circuit current is 2000 A, if the power characteristics of I-V are linear. The transformer current is 1200 A, then find the transformer voltage in volts.

Question 3

The electrode coating material in electric arc welding is

Question 4

The temperature reached in Plasma-Arc welding is nearly

Question 5

The DC power source for arc welding has the characterstic equation 4V + I = 280, where V= voltage and I= current in amp. For maximum arc power at the electrode, current should be set at _____________ amp.

Question 6

Two 8 mm thick steel plates are placed 5 mm apart and welded by a butt joint. Welding is carried out at 20 V. Heat transfer efficiency is 0.80. If the heat required to melt steel is 10 J/mm3 and melting efficiency is 0.625. The weld current  is 200 A. The welding speed (in mm/s) is ___________.

Question 7

In Gas Tungsten-Arc welding, AC current is preferred for aluminium and magnesium because
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