Chapter Seven Exam

Question 1

Which stainless steel SMAW electrode listed is designed for DC only and all position welding? (Multiple Choice)

Answer 1

E309-15.

Question 2

Using the GMAW welding process with a C02 shielding gas can transfer ________ to the weld metal. (Multiple Choice)

Answer 2

Carbon.

Question 3

Which of the following consumables would be best suited for buttering a carbon steel before welding it to a 304 austenitic stainless steel? (Multiple Choice)

Answer 3

E309.

Question 4

Which family of stainless steel is usually selected for use in automobile exhausts?

Answer 4

Ferritic.

Question 5

The presence of nickel tends to stabilize what type of structure? (Multiple Choice)

Answer 5

The FCC structure known as austenite.

Question 6

Which type of stainless steel is not prone to hydrogen cracking? (Multiple Choice)

Answer 6

Austenitic.

Question 7

Sensitization in the HAZ of an AISI 304 austenitic stainless steel can be caused by:

Answer 7

Chromium Carbides.

Question 8

Which of the following phases is the least prone to hydrogen-induced cold cracking (HICC)? (Multiple Choice)

Answer 8

FCC austenite.

Question 9

What type of stainless steel is able to undergo phase transformations on heating and cooling? (Multiple Choice)

Answer 9

Martensitic and precip hardening.

Question 10

Which stainless steels type is non-magnetic?

Answer 10

Austenitic.

Question 11

Which of the following weldments would not encounter arc blow when using a DC welding process? (Multiple Choice)

Answer 11

CJP groove weld in 10mm thick austenitic stainless steel.

Question 12

Which of these stainless steels has the best low temperature impact properties? (Multiple Choice)

Answer 12

Austentic.

Question 13

What is a typical preheat temperature used for the welding of ferritic stainless steels? (Multiple Choice)

Answer 13

Above ductile to brittle transition temperature.

Question 14

Which of the following applies when joining an FCC stainless steel to a BCC carbon steel? (Multiple Choice)

Answer 14

Combination must be joined using FCC austenitic electrodes using an approved procedure.

Question 15

Which elements in a stainless weldment can be lost transferring across the arc using an open arc welding process without inert gas shielding? (Multiple Choice)

Answer 15

NIckel, chrom, carbon? No. Maybe chrom nickel, nitrogen?

Question 16

Is it good practice to have more or less chromium in the welding electrode compared to the base metal? (Multiple Choice)

Answer 16

Should always be more chrominum.

Question 17

What determines the hardness of martensitic stainless steels?

Answer 17

High carbon content.

Question 18

With 8% nickel how much chromium must be added to produce austenitic stainless steel? (Multiple Choice)

Answer 18

18.

Question 19

What type of stainless steel is considered to be non-hardening? (Multiple Choice)

Answer 19

Ferritic.

Question 20

Would a duplex stainless steel with high chromium content be selected for high temperature applications? (Multiple Choice)

Answer 20

No, they suffer from embrittlement at temps above 350C.

Question 21

Stainless steels acquire their special properties because of the presence of: (Multiple Choice)

Answer 21

More than 10% chrom.

Question 22

Which stainless steel phase may be subject to serious embrittlement when tempered? (Multiple Choice)

Answer 22

Sigma phase after prolonged heating? No maybe duplex?

Question 23

Crevice corrosion is the reaction between: (Multiple Choice)

Answer 23

Chemical comp of electrolyte in the crevice and potential drop into the crevice.

Question 24

In addition to corrosion resistance, what is one other useful property of some stainless steels?

Answer 24

Good low temp toughness.

Question 25

It is important to note that a filler metal should always be used when welding the duplex stainless:

Answer 25

facilitate the formation of 50 percent ferrite and 50 percent austenite.