| A | B |
|---|
| GTAW is generally used with | DC or AC |
| When doing GTAW or GMAW, the electrode is held in a(n) | GTAW torch or GMAW gun |
| Which shielding gas gives the best cleaning action, cross-draft protection, and the lowest overall cost? | Argon |
| a flowmeter measures and controls the__ of the gas flow. | volume |
| The maximum current generally used on a light duty sheilding gas cooled Gtaw torch is____ amperes. | 200 |
| the color of a 2% thoriated electrode is___. | the volume of gas and the size of the joint opening |
| When selecting a nozzle for GTAW or GMAW, what determines the nozzle diameter? | red |
| Which shielding gas produces the deepest penetration when GMAW on carbon and low-alloy steel? | carbon dioxide |
| What number filter lens is recommended for use with GTAW, GMAW, and FCAW | 10-14 |
| While using ac, the arc tends to stop during the half cycle in which the electrode becomes____. | positive |
| mixing too much hydrogen with argon will cause __. | too much porosity |
| The polarity used with almost all GMAW applications is ___. | DECP |
| Which of the following is not a GMAW metal transfer method ? | Solid metal |
| In the spray transfer method of metal transfer the metal travels across the arc as __ | fine metal droplets |
| Spray transfer occurs when the current is set above the __ point . | transition |
| Spray transfer will occur only when the percentage of argon in the mixture is above __ percent . | 90 |
| When the electrode wire bunches up in the wire feeder, it is called a __ | bird's nest |
| To feed the electrode wire through the cable to the torch, the __ switch is used. | inch |
| The pulsed spray transfer method uses the peak current for welding. The background current is used to __ the arc | maintain |
| When GMAW, changing the wire feed speed changes the __. | amount of current |
| In FCAW or GMAW, the welder must maintain the __ | nozzle-to-work distance |
| Which of the following transfer methods is very effective at filling large gaps between poorly fitted parts and is appropriate for performing GMAW in the overhead position? | short circuit |
| When the edge melts too quickly while doing a lap joint, the welder should___. | point the electrode more toward the surface |
| GMA spot welding may be done on metals up to ___ in. thick. | 1/64 |
| When welding aluminum, the best DC polarity to use to clean the surface of oxides is___. | DCEP |
| ____ generally provides a smoother, quieter arc. | argon |
| When adjusting the flowmeter, what part of the ball should be aligned with the desired flow rate line? | top |
| a number 4 GTAW gas nozzle is ___ in diameter at the exit end. | 1/4 in. (6.4 mm) |
| as a rule, when using Gtaw, the electrode should extend ___ beyond the gas cup. | 1 1/2 times the diameter of the electrode |
| When GTAW, the welding rod is held at ___ to the base metal surface. | 15-20 |
| __ produces the deepest penetration when doing GTAW | DCEN |
| What type of current may be used when surface oxides must be removed ? | AC or DCEP |
| Which of the following is a recommended material for protective clothing for oxyful gas welding or cutting ? | leather |
| __ must be stored in an approved steel cabinet | Cleaning chemicals |
| It is recommended that __ be worn while resistance welding | a cap |
| __ should be used to light an oxyfuel gas flame | a spark lighter |
| All hand tools should be inspected for __. | loose parts |
| Fire extinguishers and fire blankets should be mounted on a surface that is painted__. | red |
| Which of the following are dangerous light rays developed when oxyfuel gas welding or cutting ? | Ultraviolet |
| Pure tungsten eletrode | green band |
| Tungsten with 2% ceria | orange band |
| 2% thoriated tungsten electrode | red band |
| Tungsten alloyed with zirconium electrode | brown band |
| Pure tungsten electrode with 1% lanthana | black band |
| GTAW machines are constant-_____ welding machines. | current |
| Welding machines used for GMAW or FCAW must be constant-_______ type machines | voltage |
| To reduce spatter, stabilize the arc, and improve metal transfer during GMAW operations, carbon dioxide and/or ____ may be added to argon. | oxygen |
