| 摘要 |
<p>A pasty mass to form a welding electrode is formed in a slubber comprising at least two intermeshing rotatable endless screws enclosed in a common casing. The exterior surface of the screw threads has a layer of partic. hard, metal applied along its length. Specif. the welded layers forms a flange which extends only along the exterior part of the thread, and on the outward facing part of the particular screw.</p> |
