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

In the AWS/CSA electrode classification system, 'E' stands for electrode, indicating it is a consumable electrode used in the SMAW process.

Question 2

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

Accepted Answer

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

Answer

The first two digits (70) in E7018 represent the minimum tensile strength of the deposited weld metal, which is 70,000 psi or approximately 480 MPa.

Question 3

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

Accepted Answer

DCEP (Direct Current Electrode Positive)

Answer

E7018 low-hydrogen electrodes are recommended for use with DCEP (reverse polarity), which provides deeper penetration and better arc stability. Some formulations also work on AC.

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

CSA W48 requires low-hydrogen electrodes to be stored in ovens at 120–150°C and used within a specified time (typically 4 hours) after removal to prevent hydrogen pickup, which can cause hydrogen-induced cracking.

Question 5

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

Accepted Answer

E6013

Answer

E6013 is an all-position electrode with a rutile coating that provides good arc control and slag removal, making it suitable for overhead and vertical welding. E7024, E6020, and E7028 are flat/horizontal position electrodes only.

Red Seal Welder 456A Practice Test

Red Seal Welder 456A Practice Test

456A SMAW (Shielded Metal Arc Welding)