OPERATION
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CONTROL OF WELDING CURRENT
CAUTION
•DO NOT turn the CURRENT RANGE SELECTOR while welding because the current may arc between the contacts and damage the switch.
•DO NOT attempt to set the CURRENT RANGE SELECTOR between the five points designated on the nameplate.
See Figure B.2. The CURRENT RANGE SELECTOR provides five overlapping current ranges. The FINE CURRENT ADJUSTMENT adjusts the current from minimum to maximum within each range. Open circuit voltage is also controlled by the FINE CURRENT ADJUSTMENT, permitting control of the arc character- istics.
A high open circuit voltage setting provides the soft "buttering" arc with best resistance to
When a forceful "digging" arc is required, usually for vertical and overhead welding, use a higher CURRENT RANGE SELECTOR setting and lower open circuit voltage. For example: to obtain 175 amps and a force- ful arc, set the CURRENT RANGE SELECTOR to 240- 160 position and the FINE CURRENT ADJUSTMENT setting to get 175 amps.
Some arc instability may be experienced with EXX10 electrodes when trying to operate with long arc tech- niques at settings at the lower end of the open circuit voltage range.
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FIGURE B.2 – CURRENT CONTROLS
| CURRENT RANGE | FINE CURRENT |
|
|
| SELECTION | ADJUSTMENT | 50 |
|
60 |
| |||
70 | 40 |
| ||
220 | 90 | 80 | 30 |
|
MAX. | MIN. |
|
|
|
|
| 90 | 20 |
|
|
| 100 | 10 | FINE CURRENT |
|
|
|
| |
IDLER | IGNITION PRESSURE | START | CHOKE | ADJUSTMENT |
| OIL |
|
| |
CURRENT | REMOTE |
| CONTROL |
RANGE |
|
SELECTOR |
|
