Random Questions

Question 1

In DC+ which is the anode and which is the cathode?

Answer 1

The Electrode is the Anode (the Anode is always the hottest spot) electrode is positive and there fore the anode and the cathode is the workpiece

Question 2

What is the operating factor in mma?

Answer 2

The time the welder spent welding in mma is 30%

Question 3

BS EN 2560 explain what the following electrode numbers mean.

E 50 3 2Ni B 7 2 H10

Answer 3

Question 4

What positions can cellulosic electrodes weld in?

Answer 4

All positions

Root run pipelines
Pg stoving

Question 5

What temperature cal rutile electrodes be dryer at?

Answer 5

120 degrees

Question 6

What is mig welding classified as? What what 3 types of wire are used?

Answer 6

Semi automatic

Bare or coooer coated solid wire, flux or metal cored hollow wire

Question 7

What characteristic does mig/mag have? What power source does it use? How does this affect the voltage and current?

Answer 7

A flat characteristic

Constant voltage

A small change in voltage = a large change in current

Question 8

What is the self adjusting arc in mag/mag?

Answer 8

If the arc length increases burn off rate reduces wire feed rate is constant so original length is established.

Question 10

What is CTWD in mig/mag?

Answer 10

Contact to work distance

Question 11

What do the following control in mig mag?
1. Wire feed speed
2. Voltage
3. Inductance

Answer 11

Question 12

Name all the mig/mag transfer modes aswell as there voltages and currents.

Answer 12

Question 13

What are effects of maximum and minimum inductance in dip transfer?

Answer 13

Question 14

What characteristic of bolts amperage does globular have?
What gas does it use?
What’s position?

Answer 14

Voltage and amps are not in harmony eg 24v 90 amps

100% co2

Flat pa

Question 15

If CTWD increases what happens to the amps in mig mag?

Answer 15

Drops

Question 16

In Saw what happens to the power source above 1000amps and why?

Answer 16

It’s changed from constant voltage to constant current this helps prevent arc blow

Question 17

Answer 17

RT

Question 18

What transfer mode should aluminium be welded in?

Answer 18

Spray transfer - alluminium alloys let heat dissipate quickly so spray is hotter and has to be used

Question 19

What additions in an electrode can help prevent solidification cracking and why?

Answer 19

Manganese - sulfer combines with manganese to form a higher melting point of 1600 which helps with desulphurisation rather than iron which forms iron sulfides with a melting point of 990

Question 20

Answer 20

B it’s a form of deformation

Question 21

What can you do to the prep of an alluminium weld to reduce lack of side wall fusion?

Answer 21

Increase the size of the included angle

Question 22

Answer 22

B

Question 23

Answer 23

A

Question 24

Answer 24

.4%

Question 25

What is the general acceptance criteria for bend tests?

Answer 25

Question 26

Fuelled weld fractures - what determines the acceptance criteria?

Answer 26

The standard for welder qualification

Question 27

In regards to welding positions the eu standards allow the testing position of _____? For all positions except ______?

Answer 27

H-LO45 PG down

Question 28

In regards to Welder qualifications what type of weld covers most except branch welds? And what type of weld only qualifies itself?

Answer 28

Butt welds Fillet welds

Question 29

What is the period of validity for welder quals?

Answer 29

Every 6 months needs confirmation Valid for 2 years providing the welder is working for the same manufacture Retest every 3 years

Question 30

Is stress relieving carried out below or above the critical limit?

Answer 30

Below

Question 31

What is the effect of aiming the mig torch at the weld leading back from the direction of the weld?

Answer 31

Large cap deep penetration

Question 32

Name all the post weld heat treatments and their temperatures

Answer 32

Question 33

Answer 33

A) can give an indication of a materials elongation and ductility

Question 34

Answer 34

D) both welder and procedure approval

Question 35

Answer 35

A) yield point and ultimate tensile stress

Question 36

What wires does mig welding always use?

Answer 36

Question 37

When the term shear plane is used what type of defect could be spoken about?

Answer 37

Fracture

Question 38

When is the term lateral expansion used?

Answer 38

It is the increased in width at the back of the test specimen behind the notch in charpy v testing

Question 39

In alternating current how many times does it alternate and how many cycles per second in mma?

Answer 39

Question 40

Whe electrode extension increases what happens to the burn off rate and why?

Answer 40

Question 41

What indenteres don’t he different hardness testing types use?

Answer 41

Question 42

Answer 42

Question 43

What is annodising?

Answer 43

Question 44

Dip, pulse, spray, globular…. Which has the highest CTWD?

Answer 44

Question 45

CTOD is for ECA, elaborate?

Answer 45

Question 46

What subtype chromium content of duplex stainless steel?

Answer 46

Question 47

Answer 47

Question 48

Answer 48

Question 49

What is TMCP?

Answer 49

Thermo mechanical controlled Proccessing - produce high strength steels without post rolling techniques such as normalising and and quenching

Question 50

2560 electrode designation positions

Answer 50

Question 51

Asmi electrode designation positions

Answer 51

Question 52

347 and 321 which Is niobium and which is titanium.

Answer 52

347 = niobium 321 = titanium

Question 53

What circumstances can hicc occur in weld metal? Describe the cracks?

Answer 53

.Higher strength steels with a large beads and thicker sections . 45 degrees to principal tensile stress (chevron cracks)