In GMAW, what parameter primarily dictates the deposition rate for a given joint design?

• A. Shielding gas flow
• B. Wire feed speed (WFS)
• C. Travel speed
• D. Torch angle

Answer: (B)

In GMAW, the amount of filler metal deposited per unit time is set mainly by how fast you feed the welding wire. The wire feed speed controls how much filler metal is available to melt in the arc, so increasing the feed speed directly increases the deposition rate, provided the joint design and melting conditions stay fixed. The shielding gas flow mainly influences arc stability and weld quality rather than how much metal is deposited. Travel speed affects how much metal is laid down per length of weld; welding more slowly will deposit more metal per inch, but the overall deposition rate for a fixed joint design is still driven most by the wire feed speed. Torch angle shapes the bead and penetration but doesn’t determine how quickly filler metal is added.