Oxyacetylene welding of aluminium - where joint is covered by powder mixt. of borax and chloride cpds. melted by the flame

摘要

Oxyacetylene welding is achieved between Al parts or between al and another metal which is opt. a ferrous metal, where a welding powder is applied to the joint. The powder contains 20% NaCl, 30% LiCl, 49% borax powder, and 1% ethyl chloride. The powder is pref. heated to 910 degrees C so it melts and becomes colourless; and drops of Al with a purity of 99% may be fed into the molten powder during welding. Used for welding al to Al; al to ferrous metale excluding cast iron which has too high a % C; Al to Cu alloys; or Al to Ni alloys. The process can be aplied in all industries, esp. the mfr. of motor cars; mopeds; motor cycles; aeroplanes; house fittings; electric motors. The workpieces do not require to be joined together, e.g. by rivets, screws or folds prior to welding.