Originally Posted by dr.rafi
how do you purge while brazing the circle plates there ?
I braze a small 6 inch tube a little larger than the cap tube into the base purging with nitrogen then that tube stays in for purging it gets brazed in place then later when all the sections are done i braze the suction in place then swap the nitrogen line onto the suction line then cut down and insert the cap tube down to the bottom of the centre tube i started with and braze the cap tube in place, i didnt draw it in the diagram but the cap tube is inside a tube that runs through the centre and is sealed at each section.
I find this works perfectly and keeps the entire process clean hope this helps you
PS be sure to not let the cap tube touch the base in case there is any braze thats made it too the very bottom or u could end up blocking ur cap tube and ruining the whole process
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