<rp id="ehf8e"></rp>
<th id="ehf8e"></th>

  1. <tbody id="ehf8e"><noscript id="ehf8e"></noscript></tbody>

    <tbody id="ehf8e"><noscript id="ehf8e"></noscript></tbody>

    春林門窗

    聯系我們
    濟南槐蔭春林門窗廠
    地址:濟南栗山路美里湖消防站對面
    電話:13506414902
    手機:13506414902
    聯系人:張經理
    當前位置:首頁-新聞資訊
    新聞資訊
    肯德基門的對焊接的要求有哪些?
    來源: 2017-04-14 20:13:11
    1、極易氧化。在空氣中,鋁容易同氧化合,生成致密的三氧化二鋁薄膜(厚度約0.1-0.2μm),熔點高(約2050℃),遠遠超過鋁及 肯德基門型材的熔點(約600℃左右)。氧化鋁的密度3.95-4.10g/cm3,約為鋁的1.4倍,氧化鋁薄膜的表面易吸附水分,焊接時,它阻礙基本金屬的熔合,極易形成氣孔、夾渣、未熔合等缺陷,引起焊縫性能下降。
    1, easy oxidation. In the air, aluminum easily with oxygen, the oxidation of three compact two aluminum thin film (thickness of about 0.1 - 0.2 m), high melting point (2050 C), far more than the melting point of aluminum and Kentucky door profiles (about 600 degrees Celsius). Alumina density 3.95 4.10g/cm3, about 1.4 times of aluminum, alumina film surface adsorbed water, fusion welding, it hinders the basic metal, very easy to form pores, slag inclusion, incomplete fusion defects caused by weld performancedegradation.
    2、易產生氣孔。鋁和 肯德基門型材焊接時產生氣孔的主要原因是氫,由于液態鋁可溶解大量的氫,而固態鋁幾乎不溶解氫,因此當熔池溫度快速冷卻與凝固時,氫來不及逸出,容易在焊縫中聚集形成氣孔。氫氣孔目前難于完全避免,氫的來源很多,有電弧焊氣氛中的氫,鋁板、焊絲表面氧化膜吸附空氣中的水分等。實踐證明,即使氬氣按GB/T4842標準要求,純度達到99.99% 以上,但當水分含量達到20ppm時,也會出現大量的致密氣孔,當空氣相對濕度超過80%時,如果不采取加熱等措施,焊縫就會明顯出現氣孔。同時,采用小電流慢速焊,加大焊縫冷卻時間,并利用焊絲電弧進行熔池攪動,可以較好的幫助氣體排出熔池。
    2, easy to produce pores. Aluminum and Kentucky door profiles generated during welding porosity is the main reason of hydrogen, because a lot of liquidaluminum can be dissolved hydrogen, and solid aluminum hardly dissolved hydrogen, so when the rapid cooling and solidification of molten pool temperature, hydrogen can escape easily in the weld together to form pores. Hydrogen pores are difficult to avoid completely at present, the source of hydrogen is many, there are hydrogen in the arc welding atmosphere, aluminum plate, the surface of the oxide film adsorption of water in the air, etc.. Practice has proved that even if the argon gas according to GB/T4842 standard requirements, the purity reached more than 99.99%, but when the water content reaches 20ppm, there will be a large number of stomata density, when the relative humidity of the air is more than 80%, if not to take measures such as heating, weld porosity will be significantly. At the same time, the use of small current slow welding, increase the cooling time of the weld, and the use of welding wire arc molten pool agitation, can better help the gas out of the molten pool.
    3、焊縫變形和形成裂紋傾向大。鋁的線膨脹系數和結晶收縮率約比鋼大兩倍,易產生較大的焊接變形的內應力,對剛性較大的結構將促使熱裂紋的產生。
    3, weld deformation and crack tendency. The coefficient of shrinkage and crystallization is two times bigger than steel aluminum expansion line, easy to produce welding deformation of large internal stress, will lead to hot cracks on the structure more rigid.
    4、鋁的導熱系數大(純鋁0.538卡/Cm.s.℃)。約為鋼的4倍,因此,焊接鋁和 肯德基門型材時,比焊鋼要消耗多的熱量。
    4, the coefficient of thermal conductivity of aluminum (pure aluminum 0.538 card /Cm.s. C). About 4 times of steel, therefore, when welding aluminum and KFC door profiles, more heat than welding steel.
    5、合金元素的蒸發的燒損。 肯德基門型材中含有低沸點的元素(如鎂、鋅、錳等),在高溫電弧作用下,極易蒸發燒損,從而改變焊縫金屬的化學成分,使焊縫性能下降。
    5, the evaporation loss of alloy elements. KFC door profiles contain low boiling point elements (such as magnesium, zinc, manganese, etc.), under the action of high temperature electric arc, it is easy to evaporation loss, thus changing the chemical composition of weld metal, so that the performance of the weld.
    6、高溫強度和塑性低。高溫時鋁的強度和塑性很低,破壞了焊縫金屬的成形,有時還容易造成焊縫金屬塌落和焊穿現象。
    6, high temperature strength and low plasticity. When the high temperature strength of aluminum and plastic is very low, destruction of the forming of weld metal, sometimes easy to cause the weld metal Caveand welding wear phenomenon.
    本文來自:濟南肯德基門窗多的內容請點擊:http://www.policedontmove.com我們將會為您提問的問題提供一個滿意的服務,歡迎您的來電!
    This article from: Ji'nan KFC doors and windows more content please click: http://www.policedontmove.com we will ask questions for you to provide a satisfactory service, you are welcome to call!
    [聲明] 本站圖片均由網站所有方提供,部分圖片來源于網絡,如有任何疑問請第一時間與我們聯系,未經溝通本站不承擔相關法律責任!
    在線咨詢
    陕西快乐10分