奧氏體不銹鋼及q235鋼焊接工藝要點(diǎn)與焊接性分析焊接專業(yè)畢業(yè)設(shè)計(jì)畢業(yè)論文

1、目錄摘要.......................................................................1緒論.......................................................................2第一章奧氏體不銹鋼及Q235鋼簡(jiǎn)介.............................................31.1奧氏體不

2、銹鋼及其物理性質(zhì)簡(jiǎn)介..........................................41.2低碳鋼物理性質(zhì)及其特點(diǎn)................................................41.3奧氏體不銹鋼及其焊接性................................................51.4低碳鋼及其焊接性..............................

3、........................51.5不銹鋼焊接的防范措施..................................................5第二章188鋼及Q235焊接時(shí)容易遇到的問題....................................52.1晶間腐蝕..............................................................622

4、焊接熱裂紋...........................................................62.3應(yīng)力腐蝕開裂..........................................................62.4焊縫脆化..............................................................62.5焊接變形的防止方法.....

5、...............................................72.6Q235鋼焊接時(shí)容易遇到的問題...........................................7第三章奧氏體不銹鋼的焊接特點(diǎn)..............................................73.1焊接熱裂紋.........................................

6、...................73.2晶間腐蝕..............................................................83.3應(yīng)力腐蝕開裂..........................................................83.4焊接接頭的σ相脆化..................................................

7、..8第四章奧氏體不銹鋼與Q235焊材選用...........................................84.1奧氏體不銹鋼的選材....................................................84.2奧氏體不銹鋼焊接要點(diǎn)..................................................94.3Q235的選材................

8、...........................................9第五章低碳鋼與奧氏體不銹鋼的焊接性分析......................................95.1焊縫金屬化學(xué)成分的稀釋...............................................105.2凝固過渡層的形成............................................

9、.........115.3碳遷移過渡層的形成...................................................125.4殘余應(yīng)力的形成.......................................................12第六章低碳鋼與奧氏體不銹鋼的焊接工藝要點(diǎn)...................................126.1焊接方法.............

10、................................................126.2焊接材料.............................................................126.3焊接工藝要點(diǎn).........................................................12第七章實(shí)例分析.........................

11、....................................137.1工件的下料以及組裝...................................................137.2焊接工藝的制定.......................................................14參考文獻(xiàn)..............................................

12、......................15致謝......................................................................16河北機(jī)電職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計(jì)（論文）2緒論古代焊接技術(shù)長(zhǎng)期停留在鑄焊、鍛焊和釬焊的水平上，使用的熱源都是爐火，溫度低、能量不集中，無(wú)法用于大截面、長(zhǎng)焊縫工件的焊接，只能用以制作裝飾品、簡(jiǎn)單的工具和武器。隨著焊接技術(shù)越來(lái)越發(fā)展，推廣的領(lǐng)域越來(lái)越廣

13、，從平焊到各種位置焊接，從陸地焊接到水下焊接，從單一金屬到異種金屬焊接，工件越來(lái)越復(fù)雜難度越來(lái)越大。在近代的金屬加工中，焊接比鑄造、鍛壓工藝發(fā)展較晚，但發(fā)展速度很快。焊接結(jié)構(gòu)的重量約占鋼材產(chǎn)量的45%，鋁和鋁合金焊接結(jié)構(gòu)的比重也不斷增加。現(xiàn)代的科技發(fā)展提高了焊接機(jī)械化和自動(dòng)化水平，如焊機(jī)實(shí)現(xiàn)程序控制、數(shù)字控制、研制從準(zhǔn)備工序焊接到質(zhì)量監(jiān)控全部過程自動(dòng)化的專用焊機(jī)，在自動(dòng)焊接生產(chǎn)線上，推廣、擴(kuò)大數(shù)控的焊接機(jī)械手和焊接機(jī)器人，可以提高焊接生