WELDING METHOD OF SMALL PARTS WITH SANDWICH TYPE VIBRATION-DAMPING STEEL PLATE

摘要

PURPOSE:To join surely small parts with stable strength by subjecting both steel plates of a titled vibration-damping steel plate to a spot welding in the position facing the weld position prior to projection welding of the small parts onto said steel plate. CONSTITUTION:Welding chips 4 are pressed respectively to the upper and lower steel plates 3a, 3b of a vibration-damping steel plate 3 and a bypass 5 is provided between both steel plates then both steel plates are spot-welded in the stage of welding, for example, a seat plug 2 to the upper side of the plate 3. The welding is accomplished at plural points in the optional positions in the circumferential direction of the plate 3 to form nuggets 6. The plug 2 is then placed on the plate 3a in such a way that the lower projections thereof face the nuggets 6 and the plug 2 is projection-welded to the plate 3a in the position facing the points where the nuggets 6 are provided. Weld zones 7 are thus formed.