Final answer:
In a GMAW welding setup, the amperage can be increased or decreased by adjusting the voltage, wire feed speed, and shielding gas flow rate.
Step-by-step explanation:
In a GMAW welding setup, all of the following factors can cause the amperage to increase or decrease:
- Voltage: Increasing the voltage will increase the amperage, while decreasing the voltage will decrease the amperage.
- Wire feed speed: Increasing the wire feed speed will increase the amperage, while decreasing the wire feed speed will decrease the amperage.
- Shielding gas flow rate: Increasing the shielding gas flow rate will increase the amperage, while decreasing the shielding gas flow rate will decrease the amperage.
Therefore, the correct answer is 4) All of the above.