本研究係探討Al-Zn-Mg-Zr合金應用高鎂之ER5183及ER5556銲條所製成銲件，其銲後熱處理製程對銲件機械性質之影響。
本研究內銲件應用適當之銲後頂時效(T6)、過時效(T7)及退化再時效(RRA)熱處理製程，並以硬度試驗、拉伸試驗、金相試驗、掃描式電子顯微鏡(SEM)之破斷面觀察等方法，找出對Al-Zn-Mg-Zr銲件熱處理製程中最適之固溶時間及對銲件機械性質之影響，並以能量散佈光譜儀(EDS)，與電子微探分析儀(EPMA)等分析方法，探討銲件錳元素含量對鋅與鎂元素擴散之影響。
研究結果顯示銲後熱處理製程參數受銲條錳含量之影響甚大；錳含量較高銲條所製成之銲件相較於錳含量較低者，其銲道需以較長的固溶處理時間，方能達到相同之析出強化效果。含錳量較高之ER5183銲件經固溶時間160min.之T6、T7與RRA熱處理後，其銲道硬度值與含錳量較低之ER5556銲件經固溶時間120min.者相當；此結果指出，應用較低錳含量銲條所得之銲件，可促進鋅原子在銲道內及銲道與母材間擴散之能力，使得析出強化相易在銲道內生成，並增進銲道的強度。

The objective of this study is to investigate the effect of post-welding heat treatment on mechanical properties of Al-Zn-Mg-Zr weldments made with high-Mg ER5183 and ER5556 filler wires.
Hardness test, tensile test, metallography test, and scanning electron microscope(SEM) observation of fracture surface from tensile test were conducted to identify the most appropriate time for solid solution treatment. The relationship between the time of solid solution treatment and the mechanical properties of Al-Zn-Mg-Zr weldments after post-welding T6, T7 and RRA heat treatments were studied. Energy-dispersive spectrometer(EDS) and electron probe micro analyzer(EPMA) were utilized to characterize the effect of Mn-content on diffusivity of Mg and Zn atoms.
Experimental results show that Mn-content of filler wire has strong impact on the process parameters of post-welding heat treatment. Longer solid solution time is required for welds made with filler wire having higher Mn-content to achieve the same precipitation hardening effect as weld made with filler wire having lowered Mn-content. After T6, T7 and RRA treatments of 160 min. solid solution treatment, the hardness value of the weld made with ER5183 filler wire, which has higher Mn-content than ER5556, is similar to that of the weld made with ER5556 after T6, T7 and RRA treatments of 120 min. solid solution treatment. This result indicates that the low Mn-content can promote the diffusivity of Zn atoms in the fusion zone and the ability to diffuse across the boundary between the fusion zone and the base metal, which in turn would stimulate the forming of strengthening phase to increase the strength of the weld.

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