Abstract

In magnesium alloys castings, the casting defects such as shrinkage porosity often occur. Such defects can be suppressed by repair welding or surfacing using a special filler rod. Unfortunately, in Russia, a low amount of filler rod is consumed. Therefore, domestic enterprises do not manufacture it, limiting themselves to imports or homemade low-quality substitutes. Nevertheless, there is a need for filler rod, and recently it has become unprofitable to replace them with imported materials owing to a significantly increased price. Therefore, there is a need to study the technology of its production to replace imported filler rod with domestic material. Magnesium alloys based on the Mg–Zn–Zr (La, Nd) system SV1, SV122, and ZK51 (ML12) that used as a filler rod for repair welding of ZK51 alloy castings were studied in this work. The samples were obtained by permanent mold casting into aluminum molds followed by hot extrusion into a filler rod with a diameter of 4 mm. It was shown that all the investigated alloys could be obtained in the form of a rod with a diameter of 4 mm. Therefore, the investigated rod samples from the SV122 alloy were used as filler material for repair welding of ZK51 magnesium alloy castings. The weld seam in the T1 condition has an ultimate tensile strength (UTS) about 80% of the UTS of the casting material.

中文翻译：

---

ZK51（ML12）镁合金铸件补焊用填充棒的生产

摘要

在镁合金铸件中，经常会出现缩松等铸造缺陷。此类缺陷可以通过使用特殊填充棒进行补焊或堆焊来抑制。不幸的是，在俄罗斯，填充棒的消耗量很少。因此，国内企业不生产，仅限于进口或国产劣质替代品。尽管如此，还是需要填充棒，最近由于价格大幅上涨，用进口材料代替它们变得无利可图。因此，有必要研究用国产材料替代进口填料棒的生产技术。本文研究了基于 Mg-Zn-Zr (La, Nd) 系 SV1、SV122 和 ZK51 (ML12) 的镁合金，它们用作 ZK51 合金铸件补焊的填充棒。样品是通过永久模具铸造成铝模具，然后热挤压成直径为 4 毫米的填充棒而获得的。结果表明，所有研究的合金都可以以直径为 4 毫米的棒的形式获得。因此，所研究的 SV122 合金棒材样品用作 ZK51 镁合金铸件补焊的填充材料。T1 条件下的焊缝的极限抗拉强度 (UTS) 约为铸造材料 UTS 的 80%。所研究的 SV122 合金棒材样品用作 ZK51 镁合金铸件补焊的填充材料。T1 条件下的焊缝的极限抗拉强度 (UTS) 约为铸造材料 UTS 的 80%。所研究的 SV122 合金棒材样品用作 ZK51 镁合金铸件补焊的填充材料。T1 条件下的焊缝的极限抗拉强度 (UTS) 约为铸造材料 UTS 的 80%。