| A | B |
|---|
| What is a duty cycle? | percentage of a 10 minute period which a welding power source can operate at full capacity. |
| If a 200 amp welding power source is used at 100 amps with a 50% duty cycle rating, how long can you weld at 100 amps? | 10 minutes |
| If a 200 amp welding power source is used at 200 amps 50% duty cycle rating, how long can you weld at 200 amps? | 5 minutes |
| What is the formula for Ohm's Law? | Volts X Amps + Watts, Watts divided by Volts = Amps |
| If you are welding at 200 amps with a voltage of 30, what is your wattage? | 6,000 Watts |
| What is the definition of Constant Current? | The total welding current (watts) remains the same. |
| What is the definition Constant Voltage? | The arc voltage remains constant at the selected setting even if the arc length and amperage increase or decrease. |
| What DCEN stand for, and describe the term. | Direct Current Electrode Negative. Electrode is negative, and the work is positive |
| What DCEP stands for, and describe the term. | Direct Current Electrode Positive. The electrode is positive and the work is negative. |
| What is open circuit voltage? | The voltage of the electrode before striking the arc. |
| What is operating voltage? | The voltage of the arc during welding |
| What is arc blow? | When your arc is forcibly moved from the weld puddle by a magnetic field set-up in your workpiece by the welding current. |
| What type of current is best for welding mild steel? | DC Reverse polarity. |
| What type of current is best for welding aluminum? | AC |
| What type of gas is best for welding aluminum? | Argon |
| Why is aluminum more difficult to weld than mild steel? | Aluminum has a much lower melting temperature than steel. |
| What is deposition rate? | The weight of material (steel, weld) deposited in a unit of time, usually express in kilograms a hour. |
| Heli-arc and TIG welding mean the samt thing, what are they referred to as today? | GTAW Gas tungsten arc welding. |
| Name 3 ways to break contaminated end of a tungsten electrode off: | Hammer, two pliers, wire cutters |
| Generally speaking, how many times larger should the inside diameter of the ceramic TIG nozzle be than the tungsten electrode? | 3 times bigger |
