Dte Revision Flashcards
What is MIG welding?
Metal inert gas
Mig uses argon to function
Elasticity
Elasticity is a material’s resistance to distortion and ability to return to its
original shape
Malleable
metals can be bent, pressed
and manipulated without fracturing
Ductile
Metals can be drawn or stretched without breaking
Toughness
• The toughness of metals determines their
ability to absorb energy without cracking
• A tough metal will be both malleable and ductile
• On impact, atoms in tough metals move past
each other allowing the metal to deform
instead of breaking
• ‘Superalloys’ like C300 Maraging steel
have been developed to have above average levels of toughness
Hardness
• The hardness of metals determines how well they
withstand wear and abrasion
• Tightly packed atoms form a strong metallic bond
• Alloys are usually harder than pure metals
• Alloys have different sized atoms
which mean they are less able
to slide over one another
making the metal harder
Mechanical properties
• Hardness
• Toughness
• Malleability
• Elasticity
• Tensile strength
Ferrous metals
Ferrous metals contain iron
They tend to rust/ suffer from corrosion. They need protection with paint,oil wax or a surface finish like varnish which is glossy and clear.
They react to a magnet
Non ferrous metals
Dont contain iron
They do not rust or suffer from contact with moisture.
They don’t react to a magnet
User applied finishes
Teak oil
Danish oil
Colour wash
Wax finishes
Acrylic varnish
Stains
Manufactured boards
MDF-medium density fire board
Blockboard
Plywood
Chipboard
Hardboard
Softwoods
Pine
Spruce
Cedar
Fir
Hardwood
Beech
Oak
Ash
Teek
Health and safety
Tie your hair
Use a gas mask when spray painting
Use a apron so dirt and paint etc doesn’t get on your clothes
Goggles-when cutting wood or using a machine like sander
Joining methods (wood)
Basic butt
Pocket joint
Biscuit joint
Rabbet joint
Joining techniques for metal
Welding
Adhesive bonding
Mechanical fastening
Drill bits
Twist drill
Forstner
Spade bit
