Module 19 hard facing

Question 1

What does the term hard facing mean?
A) the application of an alloy that assists corrosion
B) to weld together part that have been quenched
C) To apply a layer of material that combats wear
D) To apply material that is difficult to use

Answer 1

C) To apply a layer of material that combats wear

Question 2

Machinery parts that are subjected to where can have their service life prolonged by
A) welding with alloy electrodes
B) hard facing the ware surface
C) repairing the parts often
D) using the equipment sparingly

Answer 2

B) hard facing the ware surface

Question 3

What is a major advantage of hard facing
A) worn parts with high replacement cost can be reclaimed
B) hard facing filler alloys are cheap and easy to apply
C) any hard facing alloy can be used with any welding process
D) the very hard alloys can also withstand high impact loading

Answer 3

A) worn parts with high replacement cost can be reclaimed

Question 4

Which arc welding process is very popular for hard facing because of its low equipment, cost versatility and general ease of application
A) GMAW
B) SMAW
C) GTAW
D) FCAW

Answer 4

B) SMAW

Question 5

Which method of hard facing process is the slowest
A) SMAW
B) FCAW
C) GMAW
D) GTAW

Answer 5

D) GTAW

Question 6

What is a disadvantage of the FCAW surfacing process as compared to GMAW surfacing
A) it produces slag, which may have to be removed
B) cannot be added to the wires
C) the cord electrode can only be used on a small radius
D) the equipment is much more expensive

Answer 6

A) it produces slag, which may have to be removed

Question 7

What is the advantage of the MCA W surfacing process compared to the FCAW surfacing process?
A) the deposition rates are similar
B) special equipment is required
C) Al cannot be added to the wires
D) it produces little to no slag

Answer 7

D) it produces little to no slag

Question 8

Which arc welding surfacing method uses high currents and high deposition rates leaves no spatter and emits no harmful ultraviolet radiation
A) SMAW
B) OAW
C) SAW
D) FCAW

Answer 8

C) SAW

Question 9

Which is true of the oxy fuel, gas hard surfacing process
A) you can surface only large areas
B) the base metal does not have to be clean
C) it has a higher deposition rate than arc surfacing processes
D) it has low base metal dilution

Answer 9

D) it has low base metal dilution

Question 10

Which statement describes thermal spray surfacing
A) the flame rises the surface so that the rod can be melted onto it
B) the constructed arc is forced between the electrode and the workpiece
C) the electrode is continuous, and the arc is covered with flux
D) it heats a metallic or non-metallic material and propels it towards the object

Answer 10

D) it heats a metallic or non-metallic material and propels it towards the object

Question 11

A sliding scraping type of where that removes metal by gouging or grinding is called
A) erosion
B) abrasion
C) corrosion
D) impact

Answer 11

B) abrasion

Question 12

A gouging type of wear that washes away or grooves out the metal surface is called
A) corrosion
B) oxidation
C) erosion
D) abrasion

Answer 12

C) erosion

Question 13

A seizing or galling type of wear that rips and tears out portions of a metal surface is called
A) abrasion
B) metal metal
C) erosion
D) compression

Answer 13

B) metal metal

Question 14

The type of wear that pits perforate and eventually dissolves metal is called

Answer 14

Corrosion

Question 15

A special form of corrosion that results in the crumbling or flaking off of a metal surface is called

Answer 15

Oxidation

Question 16

A cracking splitting type of wear caused by rapidly, exposing metal parts to rapidly heating and cooling cycles is called
A) thermal shock
B) impact
C) abrasion
D) metal to metal

Answer 16

A) thermal shock

Question 17

Squeezing type of where usually caused by the imposition of a heavy static load on the surface of a metal is called

Answer 17

Compression

Question 18

Which material is the most abrasion resistant of all hard facing materials?
A) tungsten carbide
B) chromium carbide
C) austenitic manganese
D) austenitic stainless steel

Answer 18

A) tungsten carbide

Question 19

Which hard facing material can be Ferrous or non-Ferrous
A) tungsten carbide
B) chromium carbide
C) austenitic manganese
D) austenitic stainless steel

Answer 19

A) tungsten carbide

Question 20

These hard facing materials allied with 5% – 12% chromium are probably the most widely used
A) semi-austenitic
B) austenitic manganese
C) austenitic stainless steel
D) martensitic stainless steel

Answer 20

A) semi-austenitic

Question 21

These hard facing materials, which are work, hardenable are well suited for impact loading
A) tungsten carbide
B) chromium carbide
C) austenitic manganese
D) martensitic stainless steel

Answer 21

C) austenitic manganese

Question 22

For best results, the deposits with these materials should be two or more layers thick
A) tungsten carbide
B) chromium carbide
C) martensitic stainless steel
D) heat, treatable steals

Answer 22

C) martensitic stainless steel

Question 23

Which material results in a deposit that is hard if cooled quickly or soft and tough if cooled slowly
A) tungsten carbide
B) heat treatable steels
C) austenitic manganese
D) copper alloys

Answer 23

B) heat treatable steels

Question 24

Which hard facing material is used for sliding metal to metal contact and for corrosion resistant applications.
A) chromium carbides
B) Austenitic manganese
C) heat treatable steels
D) copper alloys

Answer 24

D) copper alloys

Question 25

What problem can result from the deep penetration characteristics of some ark welding processes
A) the hard facing metal may dilute with the base metal
B) the metal chunks may break away from the base metal
C) the parts may become hardened by heat treatment
D) with preheat, underbead, cracking always results

Answer 25

A) the hard facing metal may dilute with the base metal

Question 26

Which term describes the breaking away of the weld metal from the base metal
A) dilution
B) distortion
C) falling
D) spalling

Answer 26

D) spalling

Question 27

What is one method you could use to avoid stress failure when hard facing part hardened by heat treatment
A) use no preheat
B) quench in water right after welding
C) avoid interruptions during welding
D) quench in oil and cover with a blanket

Answer 27

C) avoid interruptions during welding