Method of welding to the wheel of the body of cylindrical, of the type x is stored in a material comprising on at least one of the faces of a sheet of a conductive coating in contact with the upper has adequate resistance 1 x 10 - 5 ohms / cm2

摘要

The process takes place in the context of the welding of the body of a stored formed in the cylinder, or the body, runs with lips come into superposition in a greenhouse according to this generatrice parade generatrice between the electrodes by resistance welding, the ratio of the radius of curvature of a first electrode with respect to the second being at least equal to 1,2; the material constituting the body comprises, on at least one face of a sheet made of soft steel, a coating protective conductor whose resistance specific screw - to - screw of the copper is at least 110 ohmcm. According to the process is made of a material with a ratio of the specific resistance of a first face to that of the second at least equal to 1,2, and it is the material of such a way that the first face is in contact with the first electrode. The preferred materials are provided on each face, a layer of tin of at most 1,05 gm and a mixed layer of metallic chromium (5 - 140 mgm) and chromium in the state of the oxide (1 - 30 mgm), the thickness of tin of the first face being lower to that of the second and or the thickness of chromium of the second face being lower to that of the first. The implementation of the specific resistance dissymmetry of contact, in the direction, and increases the latitude welding (range width of the conduction angle of the welding voltage); the reversal of direction of the dissymmetry cancels the latitude of welding.