Welding Week 1 Flashcards
5 types of welding joints
CBELT (Acronym)
Corner Butt Edge Lap Tee
Strongest weld joint
Lap
Junction between the face of the weld and the base metal
Toe of a weld
3 major safety hazards
danger of falling objects
spray of sparks
fumes from burning process
Where should compressed gas cylinders be stored?
Safe place with good ventilation
T/F Acetylene and oxygen cylinders should be kept apart.
True
What should you do if a regulator has a problem?
Replace regulator or send it off for repair
T/F Oil and grease should be used in an oxyacetylene or oxyfuel system.
False
_____ will prevent overexposure.
Ventilation
_____ is indicated when a torch emits a shreik or hissing sound.
Flashback
What is the minimum shade protection for oxyacetylene welding?
5
What has 2 inner flame cones and a blue envelope?
Carburizing flame
What produces the worst fumes for you?
Galvanized
Flame temperatures
Carburizing
Neutral
Oxidizing
5,700
6,000
6,300
Use a _____ to move cylinders.
cart
Oxygen connectors are left/right handed
Right
Acetylene and other fuels are left/right handed
Left
Base principle of oxyfuel gas cutting (OGC)
Oxidation aided by heat
Oxyfuel gas cutting is confined to ferrous/non-ferrous metals
Ferrous
Cutting action takes place when ____ comes in contact with red molten metal.
Oxygen
What is the difference in welding and brazing/soldering?
Base metal is not melted in brazing/soldering
Allows metal to be stretched or otherwise changed in shape without breaking
Ductility
Metal expands/contracts when it is cooled
Contracts
Resistance of a metal to local penetration by a harder substance
Hardness
Stress that resists sideways deformation in a metal
Sheer stress
7 tests to identify metal (know 4)
Appearance Hardness Magnetic Chisel Fracture Flame or torch Spark
Higher carbon content =
Lower melting point
Mixture of 2 or more elements is an
Alloy
_____ is the element that determines the basic properties of steel.
Iron
Always assume everything is _____ in a weld booth.
Hot
T/F If travel speed is too fast, welding bead will lay flat.
False
T/F During welding, the most important thing is the back of the weld.
False
T/F Quenching is the process of cooling metal slowly
False
Standards for proper welding ventilation is set by _____.
CAL OSHA
T/F Cooling rate of metal is a factor in heat treatment of steel.
True
Mechanical properties are most affected by what 3 things?
Size
Shape
Spacing of grains in metal
Stress riser causes _____.
Fatigue failure
At the end of a weld _____ is normally formed.
A crater
When oxyacetylene cutting is performed, excess slag is an indication that _____.
Cutting speed is too slow.
Stainless steels are defined by the presence of _____.
Chromium
Using a tee joint, draw a 3/8” fillet weld on arrow side.
Draw
Using a tee joint, draw a 1/2” double fillet weld.
Draw
Using a tee joint, draw a 1/2” fillet weld flush contour 12” long on other side of arrow AND a 1/2” fillet weld concave contour 1” long w/ 3” pitch arrow side with OAW process
Draw
Study of metals or metal properties
Metallurgy
Measures toughness
Impact test
Metal grows when heated
Thermal expansion
Identifies unknown metal by removing small amount
Chip test
Metals having an iron base
Ferrous
Metals containing no iron
Non-ferrous
Resist surfaces penetration, indentation and abrasion
Hardness
Compound of carbon and hydrogen
Acetylene
Ignition inside the blowpipe
Flashback
Removing hardness by cooling metal slowly
Annealing
Reheating and requenching metal to remove brittleness
Tempering
Resistance of being pulled apart
Tinsel strength
Explain safety procedures for preparing and making oxyacetylene flame cut on an 8” H beam in the field.
- PWSP (prework safety plan)
- JHA
- Ok to work or clearance
- Hot work permit
- Fire watch
- Proper PPE and fire extinguisher
- Clear area of flammable debris and protect equipment from potential damage
- Check/inspect fuel cylinders for proper operation
- Check fuel cylinders for sufficient amount of gas pressure
- Check/inspect torch for proper operation and clean tip
- Light torch and adjust flame
- Safely make cut, be aware of equipment and personnel
- Mark hot materials with chalk
- Dispose of materials safely and check area for signs of fire
- Sign off hot work permit, notify operations and file JHA
Bits of slag, flux, oxides or dirt trapped in a weld.
Inclusions
When edges or pieces of metal are heated until they flow together is called…
Fusion welding
