Abstract:

Resistance welding points, is the most important method in the assembly industry of unibody because of its automation, which is defined as the ability of the structure to provide adequate protection to passengers against injury from a collision, mainly depends on the mechanical performance of the weld nugget. To extend the life of vehicles produced coated steels. However, zinc coatings have increased the difficulty of weldability due to it being higher currents needed in the process because less resistance is presented at the welding interface due to improved electrical conductivity. This work investigates the effect of affecting the galvanized decrease electrode life, for this reason, a lost follows in the mechanical properties in the weld buttons as the number of weld points is increased. The main objective of this study is to correlate the wear of the electrodes with the mechanical properties of welded buttons. The experimental procedure involves making 1.000 welding points. Where every twenty-fifth for each welding point from the first, which were examined by stereoscopy, hardness tests, tests unbuttoning (PTS-English acronym, peel sample test) and shear stress. In the electrode wear, the face by printing carbon paper, optical microscopy and spectroscopy (EDX) X-ray was evaluated.

Key-words
IF steel; HSLA steel; Galvanized; RSW; Electrode life; Mechanical properties of welded buttons