AQA 2023 A-level DESIGN AND TECHNOLOGY: PRODUCT DESIGN 7552 Paper 1 & 2 Question Papers & Mark schemes

AQA 2023 A-level DESIGN AND TECHNOLOGY: PRODUCT DESIGN 7552 Paper 1 & 2 Question Papers & Mark schemes Work hardening - ANSWERSForms metals at colder temperatures to improve hardness and tensile strength and is reversed by annealing Annealing - ANSWERSUses heat to make metals easier to work with by heating metal then cooling slowly case hardening - ANSWERSHardening of the outer surface (or case) of a steel component by a carburizing then dipping in carbon powder then heated hardening - ANSWERSHeats medium to alter structure quenched in water,oil or saltwater quenching +hardening improves hardness and increases brittleness Soldering - ANSWERSCleaned+degreased Joint area clamped Heated up to melting point of filler/solder Solder added Metal cleaned to remove flux residue Pressure treating - ANSWERSA wood finish which protects wood from rotting and insect attack by placing wood in pressure vessel and using a vacuum and pressure to force copper preservative deeeeeeeeeeep into the wood Where is soldering used - ANSWERSIn joining precious metals (hard soldering) Plumbing and electronics (soft soldering) Rolling - ANSWERS Tempering - ANSWERSUsed for mcs +Hcs decreases hardness and increases toughness. Reduced hardness improves ductility and reduces brittle ness Works by heating metal to below critical point then it is air cooled What is modular/cell production - ANSWERSCarries out sequence of cnc processes to carry out a range of different tasks What is sub assembly and standardised components - ANSWERSSub assembly is created as a unit before being combined e.g. bike Standardised components must fit other elements of a design e.g. lightbulb What is a master production system - ANSWERSPlan that determines how many products will be made in a given time What is Embossing/Debossing? - ANSWERSWhen surface is raised/indented to create good visual effect and uses 2 dies and forms area under pressure and ink can be applied AQA 2023 A-level D