AWS Shielded Metal Arc Welding (SMAW) 2

Question 1

The AWS classification E7018 indicates which electrode properties?

Accepted Answer

70 ksi tensile, all-position, AC/DCEP, low-hydrogen potassium

Answer

E7018: E=electrode, 70=70 ksi tensile, 1=all-position, 8=low-hydrogen potassium coating, usable with AC or DCEP.

Question 2

Why must E7018 electrodes be stored in a rod oven?

Accepted Answer

To prevent moisture absorption by the low-hydrogen coating, which causes hydrogen-induced cracking

Answer

Low-hydrogen coatings are hygroscopic — they absorb moisture from the air. Moisture releases hydrogen into the weld, causing hydrogen-induced cracking (HIC). Storage in rod ovens (250–350°F) keeps the coating dry.

Question 3

When welding in the overhead (4G/4F) position with SMAW, what technique adjustment is most important?

Accepted Answer

Reducing amperage and using a shorter arc length to control the molten pool

Answer

In overhead position, reducing amperage and maintaining a short arc length produces a smaller, more controllable weld pool that resists falling from gravity.

Question 4

Which SMAW electrode coating type is best suited for pipeline root passes because of its deep penetration and suitability for vertical-down welding?

Accepted Answer

E6010 (cellulosic, high-cellulose sodium)

Answer

E6010 uses a high-cellulose sodium coating that produces a forceful, deeply penetrating arc ideal for open-root joint welding in all positions including vertical down (5G pipeline technique).

Question 5

Arc blow in SMAW DC welding is caused by:

Accepted Answer

Magnetic fields around the base metal deflecting the arc

Answer

Arc blow is the deflection of the welding arc by magnetic forces created by the interaction of the DC welding current with the magnetic fields in the base metal, fixtures, or earth ground connections.

AWS Practice Test

AWS Practice Test

AWS Shielded Metal Arc Welding (SMAW) 2