Certified Welder Base and Filler Metals 2

Question 1

Which AWS filler metal classification designates an electrode suitable for welding low-alloy, high-strength steel?

Accepted Answer

E7018

Answer

E6013

Answer

E7024

Answer

E6010

Question 2

What does the 'R' designation indicate in an ER70S-6 filler wire classification?

Accepted Answer

Rod or electrode

Answer

Rod only

Answer

Reverse polarity required

Answer

Resistant to oxidation

Question 3

A base metal with a carbon equivalent (CE) above 0.45% typically requires which precaution?

Accepted Answer

Preheat before welding

Answer

Post-weld annealing

Answer

Use of flux-cored wire only

Answer

Lower amperage settings

Question 4

Which stainless steel series is considered non-hardenable by heat treatment?

Accepted Answer

Austenitic (300 series)

Answer

Martensitic (400 series)

Answer

Precipitation-hardening grades

Answer

Duplex grades

Question 5

When welding dissimilar metals such as carbon steel to stainless steel, which filler metal is most commonly recommended?

Accepted Answer

E309L

Answer

ER308L

Answer

ER70S-6

Answer

E316L

Question 6

The mill scale on carbon steel base metal can cause which welding problem?

Accepted Answer

Porosity and incomplete fusion

Answer

Excessive penetration

Answer

Hot cracking in the HAZ

Answer

Underbead cracking

Question 7

What property of aluminum makes it challenging to weld compared to carbon steel?

Accepted Answer

Tenacious oxide layer with a much higher melting point than the base metal

Answer

Higher melting point

Answer

Tendency to form carbides

Answer

Low thermal conductivity