GAS METAL ARC WELDING - Practice Mode

1) Which type of defect is caused if the gas flowing rate is uneven?

Porosity Distortion Under cut Incomplete fusion

Correct Answer: Porosity

2) What is the difficulty in starting of arc in GMAW?

Wrong polarity Unsteady hand Work piece dirty Excess of voltage

Correct Answer: Wrong polarity

3) How to troubleshoot the burn back problem if the contact tip is plugged or worn out?

Adjust the contact tip Damaged cable connections Clean and replace contact tip Low voltage and insufficient heat

Correct Answer: Clean and replace contact tip

4) What do you call a weld joint having small holes/cavities due to entrapped gas packets?

Lack of fusion Lack of penetration Spatter Porosity

Correct Answer: Porosity

5) What is the defect in a weld joint, in which the weld metal melting through base metal resulting in holes?

Excessive penetration Lack of penetration Burn through Distortion

Correct Answer: Burn through

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