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Prostho 1 (FPD) > Lec 9 Soldering (Intro) > Flashcards

Lec 9 Soldering (Intro) Flashcards

1
Q

The joining of metal components by a filler metal, or solder, which is fused to each of the parts being joined.

A

Soldering

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2
Q

If the filler metal has a melting temperature greater than 450°C (840°F), the process is called ________.

A

Brazing

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3
Q

In ____________, the pieces that are joined are melted or fused together, without solder.

A

fusion welding

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4
Q

Solder can be used for joining, as in the fabrication of a fixed partial denture, or it can be used for building, as when an addition is made to the proximal surface of a crown.

A
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5
Q

Solder can be used for __________, as in the fabrication of a fixed partial denture, or it can be used for ___________, as when an addition is made to the proximal surface of a crown.

A
  • joining
  • building
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6
Q

____________ is the prime prerequisite of soldering, inasmuch as the soldering process depends on wetting of the surface to achieve bonding.

A

Cleanliness

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7
Q

____________ is the prime prerequisite of soldering, inasmuch as the soldering process depends on __________ of the surface to achieve bonding.

A

Cleanliness
wetting

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8
Q

______________, such as oxides and sulfides, that are present as a result of the casting process or that occur on the surface of metals when they are heated interfere with bonding.

A

Corrosion products

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9
Q

Placed on the surfaces to be soldered before they are heated. They may provide surface protection, reduce oxides, or dissolve oxides.

A

Flux

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10
Q

Soldering fluxes for noble metals are based on ___________.

They form low-fusing glasses that protect the metal surface, and they also reduce oxides such as copper oxide. They often are too fluid for preceramic soldering.

A

borate compounds

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11
Q

___________ are used on base metal alloys to dissolve the stable oxides of chromium, cobalt, and nickel. In addition to acting as solvents, these fluxes also serve a __________ role.

A
  • Fluorides
  • protective
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12
Q

Flux is more easily applied if it is in _______ form.

A

paste form

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13
Q

While a flux paste can be made with alcohol, the most popular form for use with noble metal alloys employs ___________ as a vehicle because it is more easily handled. It keeps air from the flux, and, when heated, the petrolatum burns off without leaving any residue.

A

petrolatum

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14
Q

Fluxes made from common borax, or pastes made with water, tend to effloresce when they are heated, producing pits in the solder joint.

A
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15
Q

Fluxes made from ________, or pastes made with water, tend to effloresce when they are heated, producing pits in the solder joint.

A

common borax

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16
Q
A

common borax

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17
Q

Fluxes made from ________, or pastes made with water, tend to effloresce when they are heated, producing pits in the solder joint.

A

petrolatum

18
Q

Fluxes made from ________, or pastes made with ________, tend to effloresce when they are heated, producing pits in the solder joint.

A

common borax
water

19
Q

A material used to outline the area to be soldered in order to restrict the flow of solder.

A

Antiflux

20
Q

The most common antiflux is the mark of a ___________, which works best on surfaces that do not have a high polish.

A

soft graphite pencil

21
Q

Gold solders are classified by ________ and by _______.

A

fineness
carat

22
Q

refers to parts per thousand of the solder that is gold.

A
23
Q

refers to parts per thousand of the solder that is gold.

A

fineness

24
Q

Refers to parts per thousand of the solder that is gold.

A

fineness

24
Q

Refers to parts per 24 of a metal that are gold.

A

carat

25
Q

The actual noble metal content of the solder would be given by its __________ rather than by its carat.

A

fineness

26
Q

The higher the __________ of a solder, the higher will be its ________ and the greater its ____________.

A

fineness
melting range
corrosion resistance

flow

27
Q

While a solder with a lower fineness has a lower melting range, it also has poorer ________ characteristics.

A
28
Q

While a solder with a lower fineness has a lower melting range, it also has poorer ________ characteristics.

A
28
Q

Refers to parts per thousand of the solder that is gold.

A

fineness

28
Q

____________ (iron oxide) suspended in chloroform can also be painted around the area of the solder joint to prevent undesired spread of the solder.

A

Polishing rouge

29
Q

The higher the __________ of a solder, the higher will be its ________ and the greater its ____________.

A

fineness
melting range
corrosion resistance

30
Q

While a solder with a lower fineness has a lower melting range, it also has poorer ________ characteristics.

A

poorer flow

31
Q

The minimum fineness that should be used is _____ fine, and a higher number would be better for preventing tarnish and discoloration.

A

580

32
Q

The solder should possess a fusion temperature that is about ____________ below that of the metal being soldered.

A

60°C (100 to 150°F)

33
Q

________ in solder is not desirable. More of it that occurs when there is an increased amount of ________ in the solder, which may vaporize when the gap between the components is too narrow or when the solder is over- heated.

A

Pitting
base metal

34
Q

Solder should be as strong as the alloy with which it is used. The hardness of the solder decreases as the_________ increases.

A

fineness (gold content)

35
Q

The solder should flow freely.
- _________ in the solder tends to make it adhere to metal and to flow more freely.
- __________ makes it more sluggish.

Solders that melt at _________ temperatures have a lower surface tension and flow easily through narrow gaps.
______- fusing solders flow poorly through narrow gaps.

A
  • Silver
  • Copper
  • higher
  • Low
36
Q

____________ (iron oxide) suspended in chloroform can also be painted around the area of the solder joint to prevent undesired spread of the solder.

A

Polishing rouge

36
Q

Refers to parts per thousand of the solder that is gold.

A

fineness

Prostho 1 (FPD) (10 decks)

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