氩弧重熔工艺研究──合金焊丝直接熔入法

A Sort of Argon Arc Remelting Technique: Alloy Wire Direct Melting-into

以ＺＬ１０８为研究对象，通过实验研究，提出了将高熔点的铁、镍等合金焊丝直接熔入低熔点 的铝合金表面的氩弧重熔工艺．通过硬度试验、微观组织观察和成分分析，证明了该工艺是成功 的．研究发现重熔区中铁含量越高，焊态和热处理后的硬度越高．在高于时效温度的条件下工作 时，重熔区中铁含量越高，硬度的下降率越低．文中提出将一般认为是铸造铝硅合金中的杂质的铁 作为铝硅合金的热强元素的可行性．

In this paper, ZL108 is used as the studying object. According to the testing, the Argon arc remelting technique that makes Fe and Ni of high melting point melt into Al-alloy of low melting point is given. With hardness testing and microstructure examining and composition analysising, this tech- nique is proved to be successful. It found that the more the Fe content in remelted zones, the higher their hardness after welding and heattreatment, the lower the decreasing rate of hardness working above the aging temperature. The feasibility that Fe (which is generally regarded as an impurity in casting Al-Si alloy) is used as heat-resistant and strengthening element is put forward.