456A SMAW Stick

Question 1

What does the 'E7018' electrode designation mean according to CSA/AWS classification?

Accepted Answer

E = electrode, 70 = minimum tensile strength (70,000 psi / 480 MPa), 1 = all-position capability, 8 = low-hydrogen iron powder coating with AC/DCEP

Answer

E = electrode, 70 = cost in dollars, 18 = length in inches

Answer

E = electric, 70 = amperage, 18 = rod diameter

Answer

E = electrode, 7018 = catalogue number

Question 2

What is the purpose of the flux coating on a SMAW electrode?

Accepted Answer

To shield the weld pool from atmospheric contamination, stabilize the arc, add alloying elements, and form a protective slag over the cooling weld

Answer

To make the electrode easier to grip

Answer

To increase the electrical resistance of the electrode

Answer

To colour-code the electrode for identification

Question 3

Why must low-hydrogen electrodes (E7018) be stored in a heated oven or opened from vacuum-sealed packaging?

Accepted Answer

To prevent moisture absorption by the flux coating, which can introduce hydrogen into the weld and cause hydrogen-induced cracking

Answer

To keep them warm for easier striking

Answer

To make the flux coating harder

Answer

To prevent the electrodes from sticking together

Question 4

What polarity is typically used for E7018 electrodes and why?

Accepted Answer

DCEP (DC Electrode Positive / Reverse Polarity) for deeper penetration and a smoother, more stable arc; AC is also acceptable

Answer

AC only, for better arc stability

Answer

DCEN (DC Electrode Negative / Straight Polarity) for less heat input

Answer

Polarity does not matter for SMAW

Question 5

What is arc blow in SMAW welding and how can it be corrected?

Accepted Answer

An uncontrolled deflection of the welding arc caused by magnetic fields; corrected by changing ground clamp position, welding toward the ground, using shorter arc length, or switching to AC

Answer

A loud noise from the arc; corrected by wearing hearing protection

Answer

An explosion of the electrode; corrected by reducing amperage

Answer

Excessive spatter; corrected by cleaning the base metal

Question 6

What is the correct technique for striking an arc with a SMAW electrode?

Accepted Answer

Use either a scratching motion (like striking a match) or a tapping motion, then establish the correct arc length

Answer

Stab the electrode straight down onto the workpiece

Answer

Hold the electrode close to the workpiece without touching it

Answer

Touch the electrode to the workpiece and hold it in contact for 5 seconds