FREE Certified Welder Base and Filler Metals Questions and Answers

Question 1

In the AWS classification E7018 for a shielded metal arc welding (SMAW) electrode, what does the '1' signify?

Accepted Answer

The welding position capability.

Answer

The type of flux coating and current.

Answer

The minimum tensile strength in ksi.

Answer

Its suitability for AC current only.

Question 2

A welder is tasked with joining a 1-inch thick A36 carbon steel plate to an equal thickness of 304 stainless steel plate. Which filler metal is specifically designed for this type of dissimilar metal application?

Accepted Answer

ER309L

Answer

E6010

Answer

ER4043

Answer

E70S-2

Question 3

Which of the following is the primary reason for storing E7018 low-hydrogen electrodes in a temperature-controlled oven after opening the sealed container?

Accepted Answer

To prevent the flux coating from absorbing atmospheric moisture.

Answer

To burn off any oil or grease contaminants from manufacturing.

Answer

To make the electrodes easier to strike an arc with.

Answer

To increase the electrical conductivity of the flux coating.

Question 4

What is the primary effect of increasing the carbon content in a steel base metal on its weldability?

Accepted Answer

It increases hardness and strength, making it more susceptible to cracking.

Answer

It improves corrosion resistance, making the weld cleaner.

Answer

It decreases the metal's melting point, requiring lower amperage.

Answer

It makes the metal more ductile and forgiving of procedural variations.

Question 5

A welder must perform a repair on a heavy cast iron machine housing. To ensure a successful weld and prevent the base metal from cracking, what is the MOST critical step?

Accepted Answer

Applying a significant preheat to the area around the repair.

Answer

Using a high travel speed to minimize heat input.

Answer

Cooling the weld rapidly with a water quench.

Answer

Selecting a filler metal with a lower tensile strength than the base metal.

Question 6

In the common GMAW filler metal classification ER70S-6, what do the 'S' and the '-6' signify respectively?

Accepted Answer

Solid wire, and the chemical composition/level of deoxidizers.

Answer

Submerged arc, 60 psi shielding gas pressure.

Answer

Stainless, requires 6% carbon dioxide in the shielding gas.

Answer

Shielded, for use on steel with 0.6% silicon.