微摩擦攪拌銲接應用於5086鋁合金薄板機械性質與微結構之研究

Study on the Mechanical Properties and Microstructure of the 5086 Aluminum Alloy Thin Sheets Using Micro-FSW

金信甫(Sin-Fu Jin)

指導教授 ： 于劍平

崑山科技大學/工程學院/機械工程研究所/碩士(2011年)

摘要

摩擦攪拌銲接為固態銲接製程，優異於傳統的氣體鎢極電弧銲及惰性氣體金屬電弧銲，試件選用5086鋁合金作為母材，5xxx系列具有優異的高強度、耐蝕性，可用於飛機、汽車、船舶之零件及3C產品外殼及內構件。
本實驗自行設計攪拌銲接機，以主軸轉速6000、7200、8400、9600rpm，進給速率30、60、300、600、1200mm/min，軸肩直徑8mm、5mm對板厚2mm、1mm進行銲接，並作銲道波峰間距量測、金相顯微組織觀察、硬度量測，來探討不同的加工參數後試件性質變化。實驗結果得知，主軸在高轉速加工情況下產生缺陷，進給速度增快銲道於前進側尚無填滿且有連續蟲孔產生，兩側花瓣紋相對減少，進給速率在300mm/min銲道表面填滿效果較優於其他參數。量測波峰間距結果，隨進給速率越快波峰間距越大，轉速增快波峰間距越小。試片截面硬度量測得知低進給率下銲核區硬度較為低，隨進給速率增加銲核區平均硬度有增加之趨勢。

關鍵字

5086鋁合金 ； 微摩擦攪拌銲接 ； 銲核 ； 花瓣紋 ； 裂縫 ； 蟲孔

並列摘要

Friction stir welding for the solid-state welding process, superior to conventional gas tungsten arc welding and inert gas metal arc welding, 5086 aluminum alloy specimen used as the base material, 5xxx series has excellent high strength, corrosion resistance, can be used in aircraft, automobiles , 3C products ship the parts and components within the housing.
The experimental design their own stir welding machine to spindle speed 6000,7200,8400,9600 rpm, feed rate 30,60,300,600,1200 mm / min, shaft shoulder diameter 8mm, 5mm of thickness of 2mm, 1mm welding, and for weld crest spacing measurements, metallographic observation of microstructure, hardness measurements, to explore the different processing parameters, the changing nature of the specimen. Experimental results revealed that the spindle in the case of high-speed processing defects, the feed rate faster forward side of the weld in a row and there is no worm holes filled with produce, both sides of the petal pattern reduced, the feed rate in 300mm/min fill the surface of the weld was better than better than the other parameters. Measuring the results of the peak spacing, the faster feed rate with the greater distance between peaks, the smaller the distance between wave speed faster. Hardness of the specimen cross-section measurements that the low feed rate is more low-weld hardness of the nuclear area, with the feed rate increased the average hardness of weld nucleus increasing trend.

並列關鍵字

5086 aluminum alloy ； micro-friction stir welding ； welding Nugget ； petal pattern ； cracks ； worm holes

參考文獻

[40] N. Saito and I. Shigematsu, “Grain refinement of 1050 alumiunum alloy by friction stir processing”, J. Mater. Sci. Letters. 20, 2001, p.1913-1915.

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