tig

Question 1

Define Four health and safety risks that can occur from Tig welding

Answer 1

Arc eye
Burns
Metal fume fever
Electric shock
Asphyxiation
Hf shock/burns

Question 2

Define Four precautions that must be taken to overcome the risks mentioned in question 1
Arc Eye
Burns
Metal Fume Fever
Electric Shocks

Answer 2

Face-shield with appropriate lens
Protective clothing
Extraction and ventilation
Protective clothing
Extraction and ventilation
Electrical insulation, correct earthing, use of correct fuses, circuit breakers

Question 3

Define two effects of using high frequency spark to ignite the electric arc

Answer 3

Causes hf burns
Causes hf shocks

Interfere with electronic equipment
Radio signals
Heart pacemaker
Digital equipment

Question 4

Define three precautions to be observed when using acid to etch weld specimen

Answer 4

Ensure adequate ventilation
Wear protective eyewear
Wear protective rubber gloves
Avoid contact with the acid use tongs
Dispose of waste safely

Store acids in lockable container with hazard signs

Question 5

Define three hazards associated with arc radiation

Answer 5

Visible light
Ultraviolet light
Infrared

Question 6

Define three effects from the hazards
of visible light, ultraviolet and infrared

Answer 6

Glare - eye strain
Arc eye and skin burn
Heat and skin burn

Question 7

Define three precautions that must be taken to reduce the effects of arc eye burns and eye strain

Answer 7

Use screens non Reflective painted walls
Head shields fitted with appropriate filter lens
Protective clothing

Question 8

Define six precautions to be taken when storing handling and using compressed inert shielding gas cylinders for tig welding

Answer 8

Handle cylinders carefully
Check cylinder has correct gas content
Shut the valve before moving cylinder
Secure cylinder
Check for damage and return to supplier
Check for leaks
Shut off gas when not being used
Store cylinders in well ventilated area with protection from weather
Use correct pressure regulator
Ensure cylinder can be shut off in emergency

Question 9

Define the type of welding current used for tig welding of
Steels
Stainless steels
Aluminium

Answer 9

Dc for steel and stainless steel
Ac for aluminium

Question 10

In a workshop situation define five components of a typical tig welding torch

Answer 10

Body/ handle
Head
Connections
Contractor/switch
Back cap
Nozzle
Collet
Collet holder
Electrode
Gas lens

Question 11

Define three types of shielding gas / mixtures commonly used in tig welding

Answer 11

Argon
Helium
Argon/helium
Argon hydrogen

Question 12

Define three precautionary methods used for controlling the effects of distortion during tig welding

Answer 12

Staggering welds
Pre bending
Clamping
Back to back welding of parts

Question 13

Define two types of power source used for tig welding

Answer 13

Transformer
Generator
Inverter

Question 14

Define three possible effects of an electrode touch down into the weld pool

Answer 14

Electrode contamination
Tungsten inclusion in weld
Damage to tip of electrode
Unstable welding arc

Question 15

Define the function and purpose of a slope-in control used in tig welding
And define one benefit gained from using slope in control

Answer 15

Slope in control gradually increases amperage over a set amount of time from arc ignition to reach the desired current for welding

Benefit of slope in control is it can help avoid melting the edge when starting the weld

Question 16

Define the units used for
Regulator
Flow metre

Answer 16

Psi
Lpm

Question 17

Define one type of electrode commonly used for ac tig welding

Answer 17

lanthanated tungsten
Zirconaited tungsten
Ceriated tungsten

Question 18

What is the joint type

Answer 18

Horizontal tee with fillet

Question 19

Define two methods that can be used to strike a tig welding arc

Answer 19

Touch / scratch
High frequency
Lift

Question 20

Define two types of ac waveform commonly used in tig

Answer 20

Sinusoidal
Square