| A | B |
|---|
| 2 Power sources for Arc Welding | Alternating Current Direct Current |
| Covers the weld as it cools | Slag |
| Type of current for effective arc welding | Constant current |
| T/F Current needs to be constant | True |
| When the arc is struck, what happens | Short Circuit induces surge of elecrical charge to the arc |
| Voltage when welding is running not under load | Open Circuit voltage |
| Welding running under load | Arc Voltage |
| Arc Voltage Range | 18-36 |
| Open Circuit Vltage Range | 50-100 |
| T/F It is difficult for a pro welder to keep a uniform arc | True |
| Amount of current required is determined by... | thickness of the work metal |
| Amount of time welder is on task | Duty Cycle |
| 6 minutes of welding and 4 min. of cooling | 60% Duty Cycle |
| Direction of current flow in a circuit | Polarity |
| Electrode is negative and work is positive | Straight Polarity |
| Electrode is positive and work is negativwe | Reverse Polarity |
| This takes power from wall and converts it to useable levels | Transformer |
| T/F A transformer has a primary and a secondary coil | True |
| This is created in the coil | Short Circuit |
| A wondering arc is called | Arc Blow |
| Arc blow is more of a problem with this welder | DC |
| Impurities in the weld | Porosity |
| A component of the welder that converts electricity to DC | Rectifier |
| Distance to never look at the arc | 50 feet |
| Materials that make rectifiers | Selenium, silicon, |
| Extension cords build up heat because of... | Resistance |
| Safety Governing body | OSHA |
| The compenent you hook up to your welding table | Ground Clamp |
| Purpose of the flux | Strike the arc, keep out impurities |
| Shade number for arc welding | 10 |
| Two methods of strking the arc | scratching like a match, tapping |
| Types of rays in arc welding | Ultraviolet, infrared |
| Current depends upon: | thickness of metal, actual position, diameter |
| Length of arc | 1/8' |
| Sound of weld | Frying eggs or bacon |
| Molten pool indented area | Crater |
| More than 1 weld | Multiple Pas |
| Most of our Steel | Mild steel |
| Flux materials | cellulose, titanium dioxide, cilica flour, calcium carbonate, ferro-manganeese |
| 60,000 lbs | tensile strenght |
