Welding GMAW Certification Test

In GMAW, the shielding for the molten metal is accomplished through the use of:

Inert & active gasses

GMAW is the abbreviation for:

Gas, Metal, Ark, Welding

In GMAW, insufficient gas flow can cause:

Porosity

A worn contact tube (tip) results in:

Poor Arc (Starts)

The benefit of copper coated electrode wires is:

Good feeding, good arc starts, and better storage

What type of power source is used for GMAW?

Constant Voltage (CV) Machine

In GMAW, which type of metal transfer is restricted to flat position and horizontal fillet welds?

Spray transfer

What type of electrode wire is used with GMAW?

Solid (hard wire)

In GMAW, the amperage is controlled by adjusting the:

Wire Feed Speed (WFS)

In GMAW, electrode extension is defined as the distance from the:

Tip to pool (molten metal)/contact tube to puddle

Which AWS electrode classification is correct for GMAW wire?

ER70S-6

Which of the following is considered an advantage of the GMAW process?

• Thin metal

• Easier to learn

• Easier to restart

• More comfortable

• Semi-automatic

Electric current is transferred to the electrode through the:

Tip (Contact tube)

What shielding gas or gas mixture will not produce spray transfer?

>85% Argon

The size of the contact tube (tip) should be:

Sized to match (with the wire size)

What does the 70 indicate in the electrode classification ER70S-3?

Tensile strength (max resistance to pull apart stress)— higher # = stronger rod

Excessive amounts of weld spatter in the nozzle may cause:

Porosity (gas can’t reach metal)

Which of the following is not recommended when welding with short-circuiting transfer?

Thicker metal

Which of the following is not an advantage of the GMAW process?

• thick metal

• birds nest

• no outside

• extra equipment

The transfer mode that uses low currents, low voltage, and small diameter electrode wire to weld in all positions is called:

Short circuit transfer

What positions and types of welds can be successfully welded using the spray transfer mode on carbon steel?

1F, 2F, 1G

Which shielding gas or gas mixture is most often used for welding carbon steel with the short-circuiting transfer mode?

75% Argon, 25% Co₂

Which one of the gases listed below is inert?

Argon & Helium

(True or False) What is the difference between CV and CC power supplies?

• CV= Mig

• CC= Stick

(True of False) What is the difference between travel speed and oscillation speed?

• Travel speed: from point A to point B

• Oscillation speed: Movement of gun (ex. left/right)

(True or false) What gas requirements are required to achieve a spray transfer?

≤75% Argon

(True or false) Explain every part of ER70S-6

E— Electrode

R— Rod (adding by hand)

70— Tensile strength

S— Solid wire

6— High silica