BigPatents India

The invention relates to a method of brazing of flattened formed tubes (3) with a sheet substrate in radiation panels, cryogenic panels, solar shields and other heat exchanger panels (5) comprising the following steps of laying of guiding rails (2) as per the required tube layout on the base plate (1), placing a packing shim (4) of suitable thickness between said guide rails (2) on base plate (4), placing said flattened formed tube (3) wrapped with fluxed brazing (filler material) foil (9) between said guide rails (2), placing a sheet substrate (5) treated with flux on the joint surface above the flattened formed tube (3) characterized by placing thermal stabilizer (8) on the sheet substrate as per tube layout between the clamp pads (6), clamping the thermal stabilizers and sheet substrate (4), with the base plate (1) using clamp pads (6) and clamps (7), heating gradually from one end focusing on the thermal stabilizer with a conventional flame torch (10) and progressively advancing from end to end to complete the brazing.