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border-left-width: 1px; border-right-style: solid; border-right-width: 1px; border-bottom-style: solid; border-bottom-width: 1px" bordercolor="#1a7db3"> <TABLE width="212" height="48" border="0" align="center" cellPadding="0" cellSpacing="0"> <TBODY> <TR> <TD align="left" vAlign="center" background="/images/contact.jpg"> <table width="210" border="0" cellpadding="0" cellspacing="0"> <tr> <td height="24"> <span><strong>沈阳威克创新焊接设备有限公司</strong></span> </td> </tr> <tr> <td height="24">电话:024-31029733 31029732</td> </tr> <tr> <td height="24">传真:024-62665536</td> </tr> <tr> <td height="24">手机:13840081050</td> </tr> <tr> <td height="24">E-mail:shenyangweike@163.com</td> </tr> <tr> <td height="24">地址:沈阳市于洪区沈大?46-2?/td> </tr> </table> </TD> </TR> </TBODY> </TABLE> </td> </tr> </table> </td> <td height="309" width="10"> </td> <td height="309" width="728" valign="top"> <table cellpadding="0" width="728" style="border-collapse: collapse; border-left-style:solid; border-left-width:1px; border-right-style:solid; 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>铸铁的焊接特?/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>2019-01-25 <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><a href="http://ovn-sos.com">铸铁</a>的焊接特点:</p> <p>    铸铁是一种质脆及强度较低的材料,由于灰铸铁的收缩系数小于白口铸铁,所以焊接时,当灰铸铁转化为白口铸铁时可以产生组织应力而引起裂纹,铸铁的熔点较低,加热后由固态变成液态、冷却时由液态变成固态的过程快,加上铸铁的流动性强,所以焊接时控制难度大,故只适合平焊位置的焊接,铸铁焊接过程中其组织对冷却速度极为敏感,焊接过程经常会出现许多困难?/p> <p>1、焊接接头处易产生白口和脆硬组织?/p> <p>    铸铁从熔化状态遇到骤冷,容易白口化,白口就是渗碳组织,最容易形成白口的地方是半熔化区,由于白口组织的出现,严重影响了铸件焊后的机械加工性能?/p> <p>2、焊接接头容易产生裂纹:</p> <p>    铸件的塑性小、形质脆,铸造时的残余应力与焊接应力相结合容易引起铸件的开裂,同时,半熔化区白口层的存在对裂纹的形成和扩展也有很大的影响?/p> <p>3、焊缝易产生气孔?/p> <p>    铸铁具有较高的含碳量,在焊接时碳被氧化后可生成CO气孔,此外,焊接区存在的油、锈及水分等都会在焊接反应时形成气孔?/p> <p>4、焊缝易产生粗大组织?/p> <p>    焊接过程中,如果长时间对铸件加热,会使铸件中的石墨粗大化,粗大的石墨与基体产生间隙,附近的油或水渗入进去,形成氧化皮,这些杂质在焊接时妨碍熔合,也是造成裂纹、气孔的原因,同样,长时间在腐蚀性气体中使用的铸件,也对焊接非常不利?/p> <p> </p> <p> </p> <p> </p> <p>                                 -- 沈阳威克创新焊接设备有限公司</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@163com   </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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