Addition (AQA GCSE Design and Technology): Flashcards
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15 cards from this deck
Addition in metalworking
Addition in metalworking
Connecting metals by melting & fusing for permanent joints
Three main addition processes
Three main addition processes
Welding, brazing, and hard soldering
Strongest type of metal joint
Strongest type of metal joint
Welding
Energy source for arc welding
Energy source for arc welding
Electrical energy
Function of shielding gas in arc welding
Function of shielding gas in arc welding
Protects weld from oxygen contamination
Fuel used in oxy-fuel welding
Fuel used in oxy-fuel welding
Acetylene gas mixed with oxygen
Brazing alloy composition
Brazing alloy composition
Copper and zinc alloy
Temperature required for brazing
Temperature required for brazing
Approximately 875°C
Key feature of brazing process
Key feature of brazing process
Doesn't melt base metals, only the filler alloy
Purpose of flux (borax) in brazing
Purpose of flux (borax) in brazing
Prevents oxidation & helps alloy flow
Metals suitable for hard soldering
Metals suitable for hard soldering
Metals with low melting points, e.g., copper
Advantage of hard soldering
Advantage of hard soldering
Complex constructions can be assembled in stages
Temperature order (highest to lowest)
Temperature order (highest to lowest)
Welding > Brazing > Hard soldering
Surface prep before brazing
Surface prep before brazing
Clean with abrasive paper to remove contaminants
Purpose of filler rod in oxy-fuel welding
Purpose of filler rod in oxy-fuel welding
Adds material to strengthen joint & fill gaps