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border-right-width:1px; border-top-width:1px; border-bottom-style:solid; border-bottom-width:1px" height="484" bordercolor="#1A7DB3"> <tr> <td height="28" background="/images/Title07.jpg"><span class="STYLE4">    新闻中心 </span></td> </tr> <tr> <td width="728" align="center" valign="top" style="line-height: 200%; padding-left: 5px; padding-top: 5px; color:#333333"> <table width="700" border="0" align="CENTER" cellpadding="0" cellspacing="0" style="margin-top:5px;"> <tr> <td><table width="722" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="30" height="36"> </td> <td width="673" align="center" style="color:#000000; font-size:16px; font-weight:bold"> <h1>电弧冷焊工艺应使用铸铁焊?/h1> </td> <td width="51"> </td> </tr> <tr> <td> </td> <td> </td> <td> </td> </tr> </table></td> </tr> <tr> <td align="center" style="color:#999999"><strong>发布时间?/strong>2019-01-30 <strong>来源?/strong>沈阳威克创新焊接设备有限公司 </td> </tr> <tr> <td height="20"> </td> </tr> <tr> <td> <p>电弧冷焊?a href="http://ovn-sos.com/news/news_4661.shtml">铸铁焊条</a>?/p> <p>    电弧冷焊用铸铁焊条有铁基、镍基、铜基三类焊条?/p> <p>1、电弧冷焊用铁基焊条?/p> <p>    电弧冷焊用铁基焊条是用铸铁或低碳钢、高碳钢做焊芯,焊接后使用焊接金属成为铸铁组织的一种焊条,这种焊条与上期介绍的热焊铸铁焊条相同,这种焊条含碳和硅的成分高,这种焊条也是为了使冷焊铸铁能形成软的铸铁组织而设计的?/p> <p>    这种焊条主要用于钢锭模的修补,也用于要求和母材色调一致的大型铸件且需要切削加工部位的焊接修补,铸铁焊接中,由于单层焊的修补部位容易产生白口组织,因此,焊前低温预热和焊中采用连续多层焊是防止白口化的良好措施?/p> <p>2、电弧冷焊用镍基焊条?/p> <p>    镍基焊条是铸铁冷焊常用的焊条,也是冷焊铸铁比较容易掌握的焊条?/p> <p>    镍基焊条分三种:即纯镍焊芯焊条、镍-铜合金焊芯焊条和?铁合金焊芯焊条?/p> <p>    纯镍焊芯焊条熔敷金属的硬度低,抑制过渡的作用很大,使用这种焊条可防止铸件热影响区白口化,防止接合处的硬度上升,产生裂纹的倾向小?/p> <p>    ?铜焊芯焊条中的Ni?0%(质量分数)Cu?0%(质量分数),涂料中含有石墨,这类焊条因含碳量高,焊接时有产生裂纹的倾向,特别在多层焊时,几乎是经常发生细微裂纹,因此这种焊条的用途很受限制,用于单层焊接或简单的补洞还可以,对承受水压的部件或要求强度的地方最好不用?/p> <p>    ?铁焊芯中的焊条用Ni55%(质量分数)、用Fe45%(质量分数)这类焊条的最大特点是热胀系数非常小,因此焊接时很少产生收缩应力,这也是使用这种焊条焊接裂纹少的主要原因,?铁焊条的熔点高,接头及热影响区产生白口化的倾向大,因此使用这种焊条焊接前尽量将铸件进行约为250摄氏度的预热?/p> <p>    镍基焊条涂料中,无论镍型、镍-铜还是镍-铁型都配合使用了大量的石墨,这样采用大量的石墨就把焊接处包围在还原性气氛之中,防止了铸铁熔化处、热影响区被氧化,从而还起到渗碳作用,在快冷时具有缓和白口化的功能,另外镍基熔敷金属虽然受到石墨的渗碳作用,但很难形成为镍的碳化物,它作为游离石墨存在于焊接金属之中,这对力学性能影响不大,正因为如此,焊接处并不断裂,而且焊后接头具有良好的切削加工性质?/p> <p>    降低焊接应力,镍基冷焊铸铁时最好也采用200摄氏度预热?/p> <p>    使用镍基焊条焊接时,可将焊道分成若干小段焊接,每小段的长度应小于50mm,焊接时宜采用小的热输入,尽量保持和降低焊接的层间温度,焊接过程也应不断的锤击焊缝?/p> <p>    为防止焊缝的微细裂纹,可在焊接涂料中加钛和铌等防裂元素?/p> <p>3、电弧冷焊用铜基焊条?/p> <p>    铜基焊条一般多用于阀门上的阀座面、火药滚筒等的补焊?/p> <p>    铜基焊条焊接后的铸件光泽与原始铸件的光泽完全不同,焊接过程中铸件容易偏析及焊缝金属容易淬硬、切削困难及产生裂纹的倾向大等因素限制了其在冷焊方法上的应用,但铜基焊条热焊的效果较好?/p> <p> </p> <p> </p> <p>                          --沈阳威克创新焊接设备有限公司</p> <p> </p> </td> </tr> <tr> <td height="20"> </td> </tr> </table></td> </tr> </table> </td> </tr> </table> ?table border="0" width="970" height="68" cellspacing="1" cellpadding="0" background="/images/bott_bg.gif" align="center"> <tr> <td height="20" > <p align="center" style="padding-top:10px"> <font color="#FFFFFF">版权所?沈阳威克创新焊接设备有限公司Copyright ©2007-2018 </font> </p><br /> </td> </tr> <tr> <td> <p align="center"> 地址:沈阳市于洪区沈大路146-2?nbsp; 电话?24-31029733 31029732  传真?24-62665536  E-mail?shenyangweike@163.com   </p> </td> </tr> </table> <table border="0" width="970" height="48" cellspacing="1" cellpadding="0" align="center"> <tr> <td> <p align="center"> ICP备案号:辽ICP?2005499?/p> </td> </tr> </table> <script language="javascript" type="text/javascript" src="/wwwroot/js/513ef043-1f49-4abb-93ce-04d22b778994-tj.js" charset="utf-8"></script><script> (function(){ var canonicalURL, curProtocol; 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