Re: [請益] 焊接性

看板Mechanical (機械)作者seawave (我是硫代硫酸鈉!?)時間17年前 (2007/12/02 13:12)推噓2(2推 0噓 0→)

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※ 引述《poloyeh (消滅萬惡莫耳圓~!!)》之銘言： : 各位版友您好： : 想請教各位，何謂『焊接性』？ : 因小弟最近看國考的考古題時，遇到以下一題目： : 《95年公務人員特種考試原住民考試試題》 : 5. 焊接性主要分兩方面的因素來考慮，簡單說明之。(20分) : 但小弟手邊的書籍，沒有針對此一性質多做介紹， : 上網搜尋過，似乎也找不到明確的答案。 : （目前書上有查到的，是在Kalpakjian那本機械製造中譯本裡， : 　有提到『可焊接性』(weldability)，但翻的很怪，有點難以理解。） : 想請教版上各位同仁， : 是否有人可以不吝提供一些意見呢？　謝謝。 ============================================================================= 原文 S.Kalpakjian, Manufacturing Engineering and Technology (4th ed.). Prentic Hell P.828 Weldability The weldability of a metal is usually defined as its capacity to be welded into a specific structure that has certain properties and characteristtics and will satisfactorily meet service requirement. Weldability involves a large number of variables, so generalizations are difficult. As we have seen, the material characteristics (such as the alloying elements, the impurities, the inclusions, the grain structure, and the processing history) of the base metal and the filler metal are important. Because of the effects of melting and solidification and the consequent microstructurl changes, a thoough knowledge of the phase diagram and of the response of the metal or alloy to elevated temperature over a period of time is essential. Also influencing weldability are mechanical and physical properties: strength, toughness, ductility, notch sensitivity, elastic modulus, specific heat, melting point, thermal expansion, surface-tension characteristics of the molten metal, and corrosion resistance. Preparation of surfaces for welding is important; so are the nature and properties of surface oxide films and of adsorbed gases. The particular welding process employed significantly affects the temperatures develop and their distribution in the weld zone. Other factors are shielding gases, fluxes, the moisture content of the coatings on electrodes, welding speed, welding position,cooling rate, and preheating, as well as such post-welding techniques as stress relieving and heat treating. ============================================================================== 譯文金屬的可焊接性一般定義是：焊接在特定結構有某些性能、特性與令人滿意接合幫助條件的能力。可焊接性有許多的可變因素，因此要概念化是困難的。就所知的，基材與填料金屬的性質(例如：合金元素、雜質、夾雜物、晶粒結構與處理過程)是很重要的。因此對於熔化與固化的作用、顯為結構改變的結果、相圖與升溫時金屬(或合金)的反應完善的知識是必要的。也就是機械性質與物理性質對可焊接性是有影響的：強度、韌性、延展性、缺口敏感性、彈性模數、比熱、熔點、熱擴散、融化金屬之表面張力、與抗腐蝕性。表面處理對於焊接是很重要的；也就是表面氧化膜、吸附氣體的種類與特性。在特殊焊接過程，對焊接區域的溫度變化與分布有顯著的作用。而其他因素有：保護氣體、助熔劑、電極塗層的水分含量、焊接速度、焊接劑、冷卻率、預熱方式、焊接後技術(如消除應力與熱處理)。 ============================================================================== 中譯本翻譯的實在太怪了！我把原文找出來，重新翻譯一次。不知道對你有沒有幫助。如果我翻譯的不好，就請你參考原文一下。 -- 什麼~~~~~~~~~~~~~?? 你說我像記者我才不會拿一根東西亂塞到別人嘴巴前也不會問低能的問題小心ㄧ點!!我可以告你毀謗喔 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.231.123.161