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Flashcards in Welding Deck (38)
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1
Q

How are electrodes stored?

A

Metal containers (ovens)

2
Q

Describe the bead weld

A

They are single pass deposits of weld materials used to build up the surface of metal or to replace metal on worn surfaces

weld build up

3
Q

What type of weld is common with lap, tee + corner welds?

A

Fillet welds

They join two pieces of metal that are usually at right angles (90 degrees) to each other

4
Q

What type of weld are commonly used on butt joints?

A

Groove welds

Groovy Butt

5
Q

What does a Groove weld consist of?

A

1st pass = root pass

2nd = hot pass

3,4,5th passes = fill passes

last pass = cap

6
Q

What determines the amount of weld material required on the depth of penetration?

A

Size of the root opening, root face, bevel angle + root radius

7
Q

Size of groove weld is determined by…?

A

The throat dimension

(depth of weld penetration in the groove or gap bn two pieces)

8
Q

What determines the joint to choose?

A

Strength + loading

9
Q

What are the 5 basic joints?

A

Tee, Lap, Corner, Edge and Butt

(BELT - C)

10
Q

What does Static load mean?

A

Steady + unchanging

Seen on Tee welds that are welded on only side.

11
Q

What is one downfall of Tee welds?

A

Uses lots of weld material.

Weld joints with the least amount of material should be considered as it keeps cost down.

12
Q

How are Lap joints reinforced?

A

By placing a plug or slot weld along the joint

13
Q

Which joint is most commonly used with sheet metal?

A

Edge (flange) joints.

14
Q

Which joint is used the most?

A

Butt joints -→ both pieces are on the same plane

Just gotta have that butt all to yourself…

15
Q

What does the abbreviation “F” mean?

A

Fillet weld

16
Q

What does the abbreviation “G” mean?

A

Groove weld

17
Q

What does the number 3 mean?

A

vertical position

18
Q

When are edge joints used?

A

For sheet metal

19
Q

The flow of electricity is called… and measured in….

A

Called Current and measured in Amperes

Amps = strength of current

20
Q

What happens when wires opposes flow of current?

A

Resistance happens

21
Q

Electrical utility companies distribute AC at what rate?

A

60 cycles / second

22
Q

What is Frequency?

A

The speed at which AC changes direction

23
Q

What is the definition of Cycle?

A

It is one complete revolution of the AC generator

24
Q

True or False: three-phase power are more compact / produce a smoother arc than single phase power.

A

True

25
Q

DC = the electron flow is in one direction only. Depending how the circuit is connected, the current flow can be made to affect the heat of the electrode or workpiece…

A

DC electrode negative = concentrates heat in the workplace

DC electrode positive = concentrate heat in the electrode

26
Q

What is Buzz Box

A

The sound of an AC transformer type weld machine

27
Q

What type of transformer is the most portable?

A

AC

28
Q

What is arc voltage

A

When voltage drops after the circuit is closed (completed)

Use of conductor to completed a path of an electrical current.

29
Q

What are the 2 types of electrodes?

A

Consumable: is consumed during welding

Non-consumable: is not consumed during welding

30
Q

What should you know before you pick flux?

A

Know the chemical of coating

31
Q

Why is it called Shielded Metal Arc Welding? (SMAW)

A

As the chemical in the electrode coating are vapourized, they provide the shielding required to product the molten metal from contamination by the atmosphere

32
Q

Why is the connection bn welding cable / holder a vulnerable point?

A

Because it is constantly being flexed during welding operations.

33
Q

What happens if the connection bn welding cable and holder is loose?

A

It will increase electrical resistance and cause additional heat that can wear down insulation.

34
Q

What is the name of the coating that forms on the top of an arc weld?

A

Slag

35
Q

What is the purpose of Slag?

A

To prevent weld from cooling too quickly

36
Q

What job does the paper wrapping around the electrode cable provide?

A

Allows the conductor to move easily inside the insulation when it is bent.

(conductor is covered by insulator)

37
Q

What impact test does Izod Charpy provide?

A

A welds impact strength

38
Q

What does the CSA measure?

A

Tensile strength in Megapascals