85.

86.

87.

88.

89.

90.

91.

92.

What is the purpose of inert gas used in TIG welding?
(A) Contamination in the weld metal
൯) To protect the molten metal from the atmospheric contamination
(C) Activate the molten metal
(D) To get more spatters

Why Zirconium tungsten electrodes are used in AC applications?

(A) High resistance to contamination ൯) Low resistance to contamination
(C) High resistance to porosity (D) None of these

How heat affected zone is covered and protected from atmospheric contaminations in GTAW?
(^) Argon gas (B)_ Nitrogen gas
(C) Oxygen gas (D) Butane gas

How is the inert gas directed to flow over the weld pool, in TIG welding?

(ಹ) Through the copper nozzle (B) Through the brass nozzle
(C) Through the ceramic nozzle (D) Through the metal nozzle

What is the purpose of the H.F. unit in TIG welding?
(^) To produce the AC
(B) To change AC to DC
(C) To produce power supply
(D) To initiate the arc without touching the electrode on the base metal

What is the device used to show the volume of the inert gas allowed to go to the welding torch
in TIG welding?

(A) Flow meter (B) CO: regulator

(C) Pressure meter (D) Argon regulator

What is the process of replacing the air in a pipe with argon gas that will not react with the
root of the weld?

(A) Pouring (B) Purging
(C) Pre-setting (0) Post-setting

Which will not be present on the weld bead due to the use of shielding gas in TIG welding
process?

(^) Slag (B) Overlap
(6 Undercut (D) Blow hole

13 111/2022
[P.T.0.]