冷加工及銲後熱處理對1050鋁合金銲件機械性質影響之研究

The Effect of Cold Working and Post-weld Heat Treatment on the Mechanical Properties of Aluminum Alloy 1050 Weldment

林忠傑(lin chung jack)

指導教授 ： 許良明 周長彬

國立臺灣師範大學/科技學院/工業教育學系/碩士(1999年)

摘要

摘 要
由於鋁合金具備重量輕、強度高、易加工及抗腐蝕及氧化等特性，所以在工業界廣泛受到使用，而在各種用途上涉及銲接技術也佔大部分，因銲接引發之問題對鋁材機械性質有關鍵性影響，唯有適當之銲接技術與處理，才能有效改善使銲件品質達到業界之需求。本研究針對工業用純鋁1050鋁合金進行不同程度銲前冷加工處理，再利用惰性鎢極電弧銲接，並以ER4043銲線為填料，進行平頭對接，銲後一部份再實施冷加工及退火熱處理。經由拉伸試驗、微硬度測量、金相顯微組織觀察及SEM(Scanning Electron Microscope)破斷分析，加以探討銲前不同冷加工度、銲後冷加工及銲後熱處理對銲件機械性質和微觀結構之變化。期望藉此研究提供鋁材銲接之應用與參考。
經實際測試和觀察中發現，1050鋁合金銲前實施冷加工能提高材料的強度與銲接品質，除銲道部位外其餘各部位之強度與硬度均有所提升而伸長率則呈現下降。而實施銲後退火熱處理下對1050鋁合金銲件之機械性質影響不大，而實施銲後冷加工1050鋁合金銲件則銲件母材、熱影響區之抗拉強度、微硬度值均呈現大幅提昇。然而銲件拉伸破斷面經由SEM(Scanning Electron Microscope)觀察，不論歷經何種處理方式銲件之破斷面均呈現延性破壞之現象。

關鍵字

冷加工 ； 機械性質 ； 熱處理

並列摘要

Abstract
Because the characteristics of "high strength to weight"ratio, easy formability and good corrosion resistance and oxygen
resistance, aluminum and its alloys have been applied extensively in industry.Some problems obtained from welding process can heavily influence the mechanic properties of aluminum alloy weldment. The problems can be eliminated only by proper welding skills and post weld treatments.
The purpose of this research is to study the ability of weld in aluminum alloys weldments under pre-weld cold working and post-weld heat treatment and post-weld cold working. The base metal materials are 1050 aluminum alloys with filler metal of ER4043. A series of experiments including tensile test, microhardness test, optical microscope metallography observation and SEM(Scanning Electron Microscope) were used to determine the relationship among the condition of cold working, weld structure of HAZ(Heat-Affected Zone) and type of heat treatments.
A series of experiment results and observations indicated that pre-weld cold working can increase the strength and improve the quality of 1050 aluminum alloys. After pre-weld cold working of weldment can reduce their elongation slightly , however, their uitimate tensile strength and microhardness can be enhanced except the fusion zone.And post-weld with 200℃,8 hour heat treatment can not improve the mechanical properties of 1050 aluminum alloys. After post-weld with cold working, 1050 aluminum alloys can greatly enhance its mechanical properties(tensile strength and microhardness)in base metal zone, heat affected zone . The result form SEM(Scanning Electron Microscope) observations indicated that ductile fracture surface occurred in all tensile tested specimen no matter what treatments

並列關鍵字

cold working ； mechanical properties ； heat treatment

參考文獻

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