| 摘要 |
<p>Two pieces of steel strip are welded together by a method employing projection resistance welding. A portion of one strip is formed with a series of aligned projections and arranged in superimposed relation with a portion of the other strip. The superimposed portions are moved through a welding zone located between upper and lower electrodes, typically a pair of rotatable welding wheels, through which a continuous electrical current flows. As the projections move into and through the welding zone, they are heated, flattened, melted and welded to the other of the two superimposed portions. The projections may be in the form of a continuous, elongated ridge (when the steel strips are uncoated) or in the form of spaced apart dimples (when the steel strips are coated or uncoated). <IMAGE></p> |
