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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>对点焊焊外部~陷形貌?qing)其影?/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>2019-09-09 <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://www.haoyimin123.com">点焊</a>焊外部缺陷Ş貌及(qing)其媄(jing)?/p> <p>    外部~陷指直视或用放大镜可见的缺P因毛坯准备或焊g装夹不当Q对焊过E中动态热Z形变场分布不合理而造成的,对焊件外部缺hQ错位、外观未焊透,外观环向或纵向裂U,表面局部烧伤和疏松{?/p> <p>焊g错位与失E_Q?/p> <p>    焊g上机被装夹及(qing)端Ӟ因钳口挑战不良,焊g不同轴、焊机刚性不够或焊g伸出长度q大Q均?x)引起左右g错位或失E_?/p> <p>    错位使焊件对口处l合面减,q在受力时必然有附加力矩Q而接头受力状态恶化,接头力学性能下降?/p> <p>    Ҏ(gu)加工寸要求或加工后内外寸未超差则q允怋用,q严重Q无加工余量件则作ؓ(f)不允许存在外观缺P以免因受力时发生力u扭{Q出现构件失效事故?/p> <p>表面烧伤Q?/p> <p>    表面烧伤一般多发于焊g与电(sh)极接触面污物q多Q接触不良,甉|密度q大的地方,形成局部烧伤,或者夹紧力不、顶dq大、挤压中滑移而发生条状烧伤或打弧Q焊件局部烧伤的凹坑Q条斑破坏了焊g外观整体形态及(qing)寸_ֺQ另外,也因甉|密度q大Q甉|q热而加速磨损而消耗,q成焊g其它内部或外部缺P减低了接头性能Q因此,除焊件对表面与尺寸无严格娶求之外Q一般均应避免出现表面烧伤,对外表面有要求的焊g更应严格限制?/p> <p>焊g外观环与U向开裂、疏松:(x)</p> <p>    焊g外部可见的环向开裂与U向开裂,对口处或焊g热媄(jing)响区外观环向开裂,多发生于有电(sh)剙量过长的情况下,׃高温对口处或热媄(jing)响区的晶_边界二ơ复熔,D断电(sh)后金属在收羃应力作用下出现开裂,但对口链环在对焊口尚处于塑性状态时Q夹L(fng)早松Q链环回Ҏ(gu)断对口,或顶d成动板后退而夹具尚未完全松开Q则可能佉K温尚未获得牢固接合强度的对口再度拉开Q有的完全拉断,而多数因接头周围受热不均、接头强度不同,只发生局部开裂、对q热接头、某些晶界因q热而发生低熔成分熔融,在冷却收~时Q发生沿晶或I晶裂纹Q顶锻过E中沿晶间裂UҎ(gu)大成为外观的环裂Q对焊g的纵向裂U多发生于稍低温度,一般在剙中过热流U杂质在径向收羃力作用下高温区强度较低的晶界拉开所_(d)环向和纵向开裂若开裂较,抽墩_和挤出的金属中Q焊件经加工后如未发生细或断箋裂纹Q则可以允许使用Q否则应作ؓ(f)有裂U的焊g处理?/p> <p>    当有?sh)顶L间过长,焊g对口处金属过烧严重,剙力不I火口寸q大Q液态金属难以排净Q火口难以封闭或者规范不良,对口处液态金属层在氧化物排除前已凝固Q挤压无力的条g下液态金属冷却ƈ凝固Q则形成疏松l织Q对口处特别是对口内部的疏松l织使接头的承蝲能力变得很低Q在承蝲复杂载荷条g下,即便焊后l过加工的焊件也很少允许使用?/p> <p>    上述对焊外观~陷Q除目视、放大镜(g)验外Q还采用荧光、着色等(g)验方法?/p> <p> </p> <p> </p> <p> </p> <p>                      --沈阳威克创新焊接讑֤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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