456A SMAW (Shielded Metal Arc Welding)

Question 1

What does the 'E' in an electrode classification such as E7018 stand for?

Accepted Answer

Electrode

Answer

Energy

Answer

Efficiency

Answer

Electrolytic

Question 2

In the electrode classification E7018, what does the '70' indicate?

Accepted Answer

Minimum tensile strength of 70,000 psi (480 MPa)

Answer

70% deposition efficiency

Answer

Electrode diameter of 7.0 mm

Answer

70-volt operating range

Question 3

What type of current is typically recommended for E7018 low-hydrogen electrodes?

Accepted Answer

DCEP (Direct Current Electrode Positive)

Answer

DCEN (Direct Current Electrode Negative)

Answer

AC only

Answer

Either AC or DCEN

Question 4

What is the maximum moisture content allowed for low-hydrogen electrodes (E7018) before they must be re-dried according to CSA W48?

Accepted Answer

They must be stored at 120–150°C and used within 4 hours of removal from oven

Answer

They can be stored at room temperature indefinitely

Answer

They must be used within 24 hours of opening the container

Answer

Moisture content is not a concern for E7018 electrodes

Question 5

Which SMAW electrode would be best suited for welding in all positions including overhead?

Accepted Answer

E6013

Answer

E7024

Answer

E6020

Answer

E7028

Question 6

What is the primary cause of porosity in SMAW welds?

Accepted Answer

Contamination of the weld pool by gas (moisture, oil, or coating breakdown)

Answer

Excessive amperage settings

Answer

Too fast a travel speed

Answer

Using the wrong electrode diameter