Soldering

Question 1

Silver based solder is ________ solder
Lead based solder is ________ solder

Which is more expensive?

Answer 1

Silver based solder is hard solder
Lead based solder is soft solder

Hard solder is expensive

Question 2

What materials can hard solder be used on?

Answer 2

most ferrous metals,
brass, copper and silver

Question 3

Is a hard or soft solder stronger?

Answer 3

Hard

Question 4

______ soldering requires a flam., ______ soldering requires a soldering iron

Answer 4

Hard soldering requires a flame, soft soldering requires a soldering iron

Question 5

What form does hard solder come in?

Answer 5

Comes in coils of wire, or sheets (foil)

Question 6

What additive us required when hard soldering?

Answer 6

Need to use flux. Consistency like toothpaste. Can be
revitalized with water if dried out

Question 7

What may happen as the water in the flux boils off?

Answer 7

parts may move

Question 8

What type of flame should you use when hard soldering?

Answer 8

Use a neutral or reducing flame (excess acetylene, flame rounded, not needle-like, not roaring)

Question 9

What are the steps for hard soldering?

Answer 9

• Apply heat, let heat migrate to the joint
• Watch the flux. First it turns white as the water evaporates. When it turns clear you are very close
• Apply solder. Wait. It will ball up initially, then suck in (capiliiary action)
• Remove heat. Over heating causes oxydization.
• Do not quench.
• Remove excess flux (wash or pick off)