Question: Aluminium alloys, such as Al-Mg, used in the manufacture of welded fra

Question

Question: Aluminium alloys, such as Al-Mg, used in the manufacture of welded frames for mountain bikes go through a complicated sequence of processes. Which of the following is correct? a) solution treatment ? quench ? age-hardening ? tube production b) solution treatment -» tube production -> welding of frame -quench c) tube production -> solution treatment -» quench -» age-hardening d) tube production -» welding of frame -> solution treatment - quench -» welding of frame -> cooling to room temperature -» age-hardening -» cooling to room temperature -> welding of frame -> cooling to room temperature ? age-hardening ? cooling to room temperature

Explanation / Answer

Answer is (b)

First: the alloy is pickled in acid to remove scale

2nd : tube production by shaping them into variety of designs and lengths

3rd : frames are brazed,welded,or glued with or without lugs essentially at a temperature of about 1600 F

4th: quenching

5th: age hardening to increase the strength

6th: cooling to room temperature to releive residual stresses

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