Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
59 Cards in this Set
- Front
- Back
|
You are silver brazing a metal. How does the melting point of the metal compare with the melting point of the silver brazing filler metal that you are using?
A) It is lower B) It is higher c) It is the same |
A) It is lower
|
|
|
Capillary action describes what process in silver brazing?
a) Melting filler metal only b) Melting and solidifying filler metal c) Drawing melted, filler metal into the narrow clearances between the joining members d) Extending filler metal from small openings. |
c) Drawing melted filler metal into the narrow clearances
|
|
|
The differences between brazing and soldering involves the temperature at which the filler metal melts. The process is considered brazing at what temperature?
a) 400 degrees F b) 500 degrees F c) 700 degrees F d) 800 degrees F |
c) 800 degrees F
|
|
|
What grade of Silver-brazing filler metal is used for brazing copper and copper-base alloys but it NOT intended for use with ferrous metals?
a) I b) II c) III d) IV |
c) III
|
|
|
When silver brazing a ferrous pipe joint where close tolerances cannot be maintained, wht grade of silver-brazing filler metal should you use?
a) V b) II c) III d) IV |
a) V
|
|
|
which of the following practices is NOT a function of flux used in silver-brazing operations?
a) It oxidizes the metal surfaces b) It increases the flow of brazing filler materials c) It permits the melted filler to penetrate the pores of the metal d) It brings the brazing filler metal into contact with the metals to be joined. |
a) it oxidizes the metal surfaces
|
|
|
When a prepared silver-brazing flux is NOT available, what material is an acceptable substitute?
a) a Mixture of borax and boric acid b) Muriatic acid mixed with water c) Copper Sulfate d) Tallow |
A) A mixture of borax and boric acid
12 parts borax and 1 part boric acid |
|
|
After a braze joint has been, cleaned, fluxed, and assembled, what maximum amount of time do you have to braze the joint before it must be disassembled and recleaned?
a) 8 hr b) 12 hr c) 24 hr d) 36 hr |
c) 24 hr
|
|
|
The maximum permissible diametrical clearances used in silver brazing range from 0.001 to 0.0012 inch. What factor(s) determine(s) the diametrical clearances?
a) Pipe size b) Classification of the brazed piping system c) Tube system d) All of the above |
d) All of the Above
|
|
|
Which of the following is a characteristic of heat in a metal?
a) Heat flows evenly in all directions b) Heat flows from a hotter area to a colder area c) Heat flows from a colder area to a hotter area d) Heat concentrates in a localized area |
b) heat flows from a hotter area to a colder area
|
|
|
Molten silver-base filler metal on the surface of a heated metal always flows in what direction?
a) Toward the center of the surface b) From the cooler to the hotter part of the surface c) From the hotter to the cooler part of the surface d) Toward the outer edge of the surface |
b) From the cooler to the hotter part of the surface
|
|
|
When a sheet of copper is brazed to a sheet of steel, what part of the weld should receive most of the torch flame?
a) The copper sheet side of the joint b) The groove area directly ahead of the puddle c) The center line of the joint d) The steel sheet side of the joint |
d) the steel sheet side of the joint
|
|
|
Parts should be recleaned before fluxing if what maximum amount of time has elapsed?
a) 12 hr b) 10 hr c) 8 hr d) 4 hr |
c) 8 hr
|
|
|
when brazing with a silver base filler metal, which of the following flame adjustments should you use on the oxyacetylene torch?
a) Neutral b) Excess Acetylene c) Slightly Oxidizing d) Carburizing |
d) Carburizing
|
|
|
What is the basic problem of heat control in silver brazing?
a) Heating the thinner section faster than the thicker section b) Heating the thicker section faster than the thinner section c) Bringing both parts to the correct temperature at the same time. d) Bringing both parts to a temperature slightly below the melting temperature of the filler metal at the same time |
c) Bringing both parts to the correct temperature at the same time.
|
|
|
When silver brazing, how is the filler metal melted?
a) By the flame b) By the heat of the joint c) By the heat of the surrounding air d) By the heat in the thickest member |
b) By the heat of the joint
|
|
|
When joining a pipe and fitting by the insert method, what heating procedure should you follow?
a) Heat the pipe only b) Heat the fitting only c) Heat the fitting first, then the pipe d) Heat the pipe first, then the fitting |
d) Heat the pipe first, then the fitting
|
|
|
Why should flux be removed after the brazing process?
a) It causes scaling of the pipe b) It causes discoloration c) It causes corrosion d) it causes crystallization of the fitting |
d) It causes corrosioin
|
|
|
After silver brazing a section of piping, you must perform a hot flush with fresh water. During the flushing evolution, the water must be maintained at what minimum temperature?
a) 110 degrees F b) 125 degrees F c) 135 degrees F d) 150 degrees f |
a) 110 degrees F
|
|
|
After debrazing a pipe from a fitting and removing old brazing alloy, what type of inspections must be performed on the fitting before it can be reused?
a) visual 5X and radiographic b) Liquid penetrant and radiographic c) Magnetic particle and radiographic d) Visual 5X and liquid penetrant |
d) Visual 5X and liquid penetrant
|
|
|
After sizing a copper-nickel alloy pipe, what type of inspection must be performed before the pipe can be reused?
a) Visual 5X and radiographic b) Liquid penetrant and radiographic c) Magnetic particle and radiographic d) Visual 5X and liquid penetrant |
d) Visual 5X and Liquid penetrant
|
|
|
What minimum temperature should parts be subjected to if they are joined by braze welding?
a) 650 degrees F b) 700 degrees F c) 750 degrees F d) 800 degrees F |
d) 800 degrees F
|
|
|
A cast iron part exposed to certain conditions is difficult to braze and requires extensive cleaning before brazing. Which of the following conditions is NOT a factor?
a) Oil at a high temperature b) Salt Water c) Fresh Water d) Oil under pressure |
d) Oil under pressure
|
|
|
When brazing welding a casting, which of the following techniques should you use to avoid stresses and strains caused by heating along the line of weld?
a) Anneal the casting b) Preheat the casting c) Tin the casting d) Postheat the casting |
b) Preheat the casting
|
|
|
Why is flux essential in braze welding?
a) It dissolves oxides b) It dissolves nitrides c) It cleans dirty metal d) It cleans the brazing filler metal |
a) It dissolves oxides
|
|
|
What type of flame is used for braze welding?
a) Neutral b) Slightly Oxidizing c) Heavily Oxidizing d) Slightly Carburizing |
b) Slightly Oxidizing
|
|
|
When using the braze welding process, which of the following conditions tells you that the temperature of the base metal is right for tinning?
a) The molten filler metal has a consistency similar to that of molassess b) The molten filler metal forms into globules of metal on the surface of the base metal c) The molten filler metal vaporizes at it spreads over the surface of the base metal d) The molten filler metal spreads over the surface as evenly as water spreads over a clean moist surface |
d) The molten filler metal spreads over the surface as evenly as water spreads over a clean moist surface.
|
|
|
While braze welding, where does tinning take place?
a) Just ahead of the puddle b) To the sides of the puddle c) Behind the puddle d) Upon solidification |
a) Just ahead of the puddle
|
|
|
Which of the following conditions controls the proper rate of braze welding?
a) The amount of flux used b) The rate of tinning c) The size of filler metal d) The size of the molten puddle |
b) the rate of tinning
|
|
|
What is the last step in a braze-welding process?
a) Quench the metal in a cold oil bath b) Place the metal in a draft of cold air c) Place the metal under stress immediately d) Allow the metal to cool slowly and evenly |
d) Allow the metal to cool slowly and evenly
|
|
|
Soft solders melt below what maximum temperature?
a) 600 degrees F b) 700 degrees F c) 800 degrees F d) 900 degrees F |
c) 800 degrees F
|
|
|
How are nonelectrical soldering irons sized?
a) By weight b) By shape c) By tip shape d) By standard numerical size |
a) By weight
|
|
|
How are electrical soldering irons rated?
a) By the number of watts consumed b) By the number of volts consumed c) By tip design d) By tip shape |
a) By the number of watts consumed
|
|
|
When preparing to tin the copper head, you have heated the head so it can melt solder. What should be your next step?
a) Rub solder directly on the head b) Rub the filed sides of the head across a cake of sal ammoniac c) Rub solder on a cake of sal ammoniac d) Tin the copper head |
b) Rub the filed sides of the head across a cake of sal ammoniac
|
|
|
What are the preliminary steps in filing a cold, but once- overheated, soldering copper?
a) Heat the copper head until it is cherry red, then clamp the copper in a vise. b) Clamp the copper in a vise, then treat the copper head until it is cherry red c) Without clamping the copper in a vise, heat the copper head so it will be hot enough to melt solder d) Without clamping the copper in a vise, heat the copper head so it will not be enough to melt solder |
a) Heat the copper head until it is cherry red, then clamp the copper in a vise
|
|
|
Most soft solders are an alloy of what two metals?
a) copper and silver b) zinc and copper c) zinc and lead d) tin and lead |
d) Tin and lead
|
|
|
Which of the following statements solder?
a) It is composed of 30% lead b) It is composed of 30% tin c) It is composed of 30% silver d) It is composed of 30% zinc |
b) It is composed of 30% zinc
|
|
|
What is the purpose of using flux to join metal?
a) It softens the metal b) It hardens the solder c) It cleans the metal d) It aids in oxidation |
c) It cleans the metal
|
|
|
You have just finished soldering with a corrosive flux. What should be your next step?
a) sprinkle the joint with a powdered noncorrosive flux b) Dip the joint in a solution of water and sal ammoniac c) Rub the joint with a mixture of turpentine and powdered rosin d) Remove all traces of the flux or as much of the residue as possible from the work |
d) Remove all traces of the flux or as much of the residue as possible from the work
|
|
|
Which of the following types of flux should be used to solder electrical connections?
a) Highly Corrosive b) Mildly Corrossve c) Both 1 and 2 above d) Noncorrosive |
d) Noncorrosive
|
|
|
What general procedure should be used to solder a pipe joint with a torch?
a) Heat the joint, apply cold solder to the hot surfaces, then wipe off excess solder with a damp cloth b) Heat the joint, apply beads of solder to the hot surfaces with a copper, then wipe off excess solder with a dry cloth c) Heat the joint, apply cold solder to the hot surfaces, then reheat the joint until excess solder disappears d) Put beads of cold solder on the joint, heat the joint and solder, then wipe off the excess solder with a damp cloth |
a) Heat the joint, apply cold solder to the hot surfaces, then wipe off excess solder with a damp cloth
|
|
|
Why are aluminum alloys hard to solder?
a) They require the use of corrosive fluxes b) They are covered with a film of oxide c) They give off heat as fast as they receive it d) They melt at temperatures lower than the melting points of tin-lead solders |
b) They are covered with a film of oxide
|
|
|
You must remove the thick layer of oxide from aluminum before soldering by what method?
a) Filing b) Wire brushing c) Both 1 and 2 above d) Corrosive flux |
c) Both 1 and 2
filing and wire brushing |
|
|
When you are soldering aluminum with a torch, where should you direct the torch flame?
a) Toward the flux b) Toward the solder c) Toward the work surface d) Toward the metal near the work surface |
d) Toward the metal near the work surface
|
|
|
Silver brazing filler metals are...?
a) ferrous metals b) copper-zinc alloy c) non ferrous metals d) none of the above |
c) non ferrous metals
|
|
|
Silver brazing filler metals covered in Navy specifications have the following major characteristics:
|
Low melting point
High tensile strength High resistance to corrosion Flows readily at the lower brazing temperatures brazes readily to copper and to copper alloys |
|
|
How many different filler metals are used in the Navy?
|
6 are used:
Grades 0, I, II, III, IV, and V |
|
|
Grades 0, I and II are suitable for joining:
a) non ferrous b) copper-based alloys c) ferrous d) ferrous and nonferrous |
c) ferrous
|
|
|
Grade III is used for brazing:
a) ferrous b) Copper and copper-based alloys c) non ferrous d) ferrous and nonferrous |
b) Copper and copper-based alloys
|
|
|
Grades IV is used for joining
a) hard materials b) ferrous and non ferrous c) copper and copper-base alloys d) ferrous |
b) ferrous and nonferrous
|
|
|
Grade V is used when the characteristics of grade IV are required, Grade V should be used for:
a) ferrous and nonferrous b) hard materials c) copper and copper based alloys d) ferrous |
b) hard materials
|
|
|
What 3 forms can you get flux in?
|
Liquid, Paste, and powder
|
|
|
What type of joint is used most frequently in silver brazing?
a) scarf joint b) butt joint c) Lap joint d) Edge joint |
c) Lap joint
|
|
|
What metal is a rapid conductor of heat?
a) steel b) Iron c) Copper d) Aluminum |
C) Copper
|
|
|
what size tip is suitable for silver brazing?
a) 4 b) 5 c) 6 d) all of the above |
d) all of the above
|
|
|
The best filler metal for braze welding is:
a) Naval Brass b) Copper c) Steel d) Copper-Zinc |
a) Naval Brass
|
|
|
Surfacing is a process in which a layer of some special ferrous or nonferrous alloy is welded to:
a) Joints b) Surface of new or old parts c) Surface of new parts d) Surface of old parts e) a and b only |
b) Surface of new or old parts
|
|
|
Soldering is used to join?
|
Iron, nickel, lead, tin, copper, zinc, aluminum, and many alloys. Soldered joints are not as strong as welded joints, and should not be used where any great mechanical strength is required. Soft solders always have melting points below 800 degrees F and below the melting points of the metals to be joined.
|
|
|
What are the 2 types of soldering irons in use by the Navy?
a) air pressure and electrical b)electrical and manual c) electrical and non electrical d) electrical only |
c) electrical and non electrical
non electrical irons must be heated over a gas flame. Electric soldering iron transmit heat to the copper bit after the heat is produced by an electric current that flows through a self-contained coil of resistance wire; this coil is called the heating element. |
