FREE Certified Welder GMAW Parameter Settings Questions and Answers

Question 1

When setting up a GMAW machine for welding mild steel in the short-circuit transfer mode, increasing the wire feed speed (WFS) primarily has which of the following effects?

Accepted Answer

Increases weld current and deposition rate.

Answer

Decreases weld current and penetration.

Answer

Increases arc voltage and spatter.

Answer

Decreases arc voltage and bead width.

Question 2

A welder is experiencing excessive spatter and an unstable arc while performing GMAW on 1/4-inch mild steel. The current settings seem appropriate for the material thickness. Which of the following parameter adjustments is most likely to reduce spatter and stabilize the arc?

Accepted Answer

Increase the arc voltage.

Answer

Increase the shielding gas flow rate.

Answer

Decrease the wire feed speed.

Answer

Decrease the stick out.

Question 3

For GMAW, what is the primary purpose of adjusting the 'inductance' control, especially when working with short-circuit transfer?

Accepted Answer

To control the frequency of wire short-circuits and the weld puddle fluidity.

Answer

To adjust the open-circuit voltage for arc initiation.

Answer

To regulate the shielding gas flow rate.

Answer

To change the travel speed of the welding torch.

Question 4

A welder needs to increase penetration on a GMAW butt joint without significantly changing the bead width. Assuming other parameters are optimized, which adjustment would be most effective?

Accepted Answer

Increase wire feed speed.

Answer

Increase travel speed.

Answer

Decrease arc voltage.

Answer

Use a larger diameter electrode wire.

Question 5

When performing GMAW with a mixed shielding gas (e.g., 75% Argon / 25% CO2), what effect does a significantly low gas flow rate typically have on the weld?

Accepted Answer

Porosity, poor arc stability, and increased spatter.

Answer

Increased penetration and reduced porosity.

Answer

Excessive spatter and a colder arc.

Answer

Wider bead width and decreased deposition rate.

Question 6

In spray transfer GMAW, which combination of parameter settings is generally required to achieve the desired metal transfer and avoid short-circuiting?

Accepted Answer

High voltage and high wire feed speed.

Answer

High voltage and low wire feed speed.

Answer

Low voltage and high wire feed speed.

Answer

Low voltage and low wire feed speed.