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目前，铁路长途通信电缆施工中，均以接头盒代替铅管封焊。其过桥线的焊接，是要将50mm的多股铜线（7～9股，0．9mm）焊接在两层钢带与铅护套上，因多股铜线松散，操作起来很不容易，且焊接质量不高。为此，我们在施工中，将9股铜线编织成3×3股的“导电带”。经过这一改进，焊
At present, the construction of railway long-distance communications cable, are replaced by the joint box plumbing seal. Its cross-bridge welding, is to 50mm multi-strand copper wire (7 to 9 strands, 0.9mm) welded in two layers of steel and lead jacket, due to loose stranded copper wire, the operation is not easy , And welding quality is not high. To this end, we are in the construction, the 9 shares of copper braided into 3 × 3 shares of the “conductive belt.” After this improvement, welding