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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>沈阳威克创新焊接讑֤有限公司</strong></span> </td> </tr> <tr> <td height="24">?sh)?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z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 id="qsoucqg" 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>点焊?sh)阻热及影响因?/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>发布旉Q?/strong>2020-03-25 <strong>来源Q?/strong>沈阳威克创新焊接讑֤有限公司 </td> </tr> <tr> <td height="20"> </td> </tr> <tr> <td> <p><a href="http://m.haoyimin123.com">点焊</a>?sh)阻热及影响因素Q?/p> <p>?sh)阻热的产生Q?/p> <p>    ?sh)阻热的热源是?sh)ȝQ当甉|过g的时候,g发热,温度升高?/p> <p>?sh)阻的媄响?x)</p> <p>    焊接区的ȝ(sh)阻R包括焊g本n?sh)阻RWQ焊仉接触?sh)阻RcQ焊件与甉|间电(sh)阻Rew之和?/p> <p>    焊g本n?sh)阻Rwo当焊件厚度和甉|一定时Q焊件本w电(sh)阻RW取决于它的电(sh)ȝQ电(sh)ȝ高的金属Q如不锈钢)导热性差Q电(sh)ȝ低的金属Q如铝合金)导热性而散热易Q因此,前者可采用电(sh)(几千安)q行焊接后,后者需用很大的甉|Q几万安Q焊接?/p> <p>    ?sh)阻率不仅取决于金属U类Q还与温度有养I随着温度的升高,?sh)阻率增大,q且金属熔化时的?sh)阻率比熔化前?-2倍?/p> <p>    焊接Ӟ随着温度的升高,除电(sh)ȝ增高使Rw增大外,同时׃金属的压溃强度降低,使焊件与焊gQ焊件与甉|间的接触面积增大Q因此引起Rw减少Q点焊低钢Ӟ在上qCU相互矛盄因素影响下,加热开始时Rw逐渐增加Q当熔核形成Ӟ逐渐减少?/p> <p>焊g间接触电(sh)阻Rc。电(sh)阻Rc是由以下两个斚w原因形成的:(x)</p> <p>1、焊件和甉|间有高电(sh)ȝ的氧化膜Q得电(sh)受到较大阻,q厚的氧化膜?x)导致?sh)不通?/p> <p>2、由于焊件表面的微观不^度,使焊件只能在_糙表面的局部Ş成接触点Q在接触点Ş成电(sh)的集中Q由于电(sh)的通\减少而增加了接触处的?sh)阻Rc?/p> <p> </p> <p> </p> <p> </p> <p>                              --沈阳威克创新焊接讑֤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?沈阳威克创新焊接讑֤有限公司Copyright ©2007-2018 </font> </p><br /> </td> </tr> <tr> <td> <p align="center"> 地址Q沈阛_于洪区沈大\146-2?nbsp; ?sh)话Q?24-31029733 31029732  传真Q?24-62665536  E-mailQ?shenyangweike@163.com   <script type="text/javascript"> var _bdhmProtocol = (("https:" == document.location.protocol) ? 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