GTAW Chapter 8 Vocab

What is the term for the period of high current used to melt and weld the base metal?

• Preflow

• Peak current

• Postflow

• Sine wave

Which term is used at the beginning of a weld to gradually increase the current from zero to welding current?

• Touch starting

• Upslope current

• Downlope current

• Background current

What is the process called when the electrode touches the base metal and is then withdrawn to 1/8 inch above the material?

• High-voltage starting

• Touch starting

• Superimposed Highfrequency

• Pulsed arc

What term describes the gradual decrease in current at the end of a weld, allowing the weld pool to fill and slowly cool?

• Preflow

• Postflow

• Downlope current

• Exit diameters

What is the diameter of the nozzle opening closest to the weld arc called?

• Exit diameters

• Sine wave

• Background current

• Preflow

Which term provides a period of high welding current and a period of low welding current?

• Pulsed arc

• Superimposed Highfrequency

• High-voltage starting

• Touch starting

What continues to flow after the arc has stopped to shield the weld pool after it has cooled?

• Preflow

• Postflow

• Peak current

• Sine wave

Which term refers to the current that is maintained at a low level during the welding process?

• Background current

• Peak current

• Preflow

• Exit diameters

What does the graph of AC current from DCEP to DCEN represent?

• Voltage increase

• Current decrease

• Current transition

• Voltage stability

What is the role of gas flow before the arc?

• To cool the electrode

• To increase the arc length

• To shield the pool immediately

• To decrease the voltage