Today on the market we have a range of many different aluminium alloys. Most bicycle companies make tubes for the frame by their own specifications. Adequately designed aluminium frames give essential advantages: low weight, high resistance to corrosion and low price. Also, they are simple to manufacture, because tubes can be drawn, bent, and shaped in almost any form. However, main problem with aluminium frames come from their strength loss due to welding, and in comparison with other frame materials, aluminium is more susceptible to fatigue failure at lower cycle counts and has finite fatigue life. In the first part of the work are presented aluminium alloys and their division into series, welding procedures that are generally used for welding of aluminium and its alloys, weldability problems and non-destructive methods of testing, as well as shortly described typical bicycle frame design, and alloys that are used in its manufacturing. Second part of the work is based on the examination of the crack and repair welding of joint on the aluminium bicycle frame made out of the EN AW-7005 alloy, which is one of the most common alloys used in bicycle industry. The experiment was composed of non destructive testing of the weld using penetrant method, repairing the crack using TIG procedure, and afterwards testing the repair weld again using the penetrant method to establish that the repair was performed correctly. After the experiment was done, the conclusion was made about possibility and profitability when repairing the damaged aluminium frame.