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Right, got DT4 (A2) Product Design exam tomorrow.
Always get confused with the questions on permanent and non-permanent methods of joining either similar or non-similar materials together.
Basically, whats the definition of a permanent and non-permanent fixing method? And what are some good examples of each?
Ta, Duane 🙂
Not a DT teacher, but did A-level DT and have just finished a Design degree...
it is rather simple really,
Permanent fixing methods (eg. welding) cannot be undone without damaging the parent material.
Semi-permanent methods (eg riveting) can be undone usually by destroying the fixing method (in this case by drilling out the rivet), but the parent material is left intact.
Non-permanent (eg. nuts and bolts) can be undone and redone a number of times without damaging either the parent material or the fixing.
This is not a 'text-book' answer, rather one off the top of my head, but as far as I'm aware it should suffice.