It points out that the direct spot welding of pure copper can be realized by the correct choice of pole material, pole form, welding equipment and criterion.
找出了用通常方法不能点焊纯铜的原因，介绍了纯铜点焊焊核形成的过程，指出以本文为依据正确地选择电极材料、电极形状、焊接设备和确定焊接规范，就可实现纯铜的直接点。
For this issue, the method, which is the quality controlling of spot welding in the external direct current magnetic field, will be discussed by this article.
针对这个问题，本文探讨了外加直流磁场改善点焊质量的方法。
For this issue, the method, which is the quality controlling of spot welding in the external direct current magnetic field, will be discussed by this article.
针对这个问题，本文探讨了外加直流磁场改善点焊质量的方法。
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