Guys , I 'm call on this list's wisdom . I need to solder or braze an aluminium AC condensor . The person who removed it couldn't undo the nut at the condensor side , and decided to twist it until it broke off ..... at both ends . The tube wall thickness is 1mm ( 1/32") , and altough I consider myself a reasonable tig welder , I think this is impossible to weld . These kind of repairs call for a capillary joint . But on aluminium that is not an easy task . I know it's possible , I ve seen it more then once on alu AC systems . Anyone have experiance with this . There are fluxes out there that ought to work , but I haven't been able to find any . I'm in Europe btw . I know about these brazing rods where you have to scratch the molten joint with a tungsten needle , but that won't work here I'm afraid . Tubing is 12mm od , with a 1mm wall , the repair is 12mm id with a wall of 2mm . Suggestions , comments ... fire away . Picture of the broken part , and the repair part I made .