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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>ϲ:~焊旉免裂U与凹坑的工艺方法有哪些Q?/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 class="njp">发布旉Q?/strong>2019-05-23 <strong class="njp">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="//www.dycmm.icu/">ͳһͼϲ</a> www.dycmm.icu <a href="//www.dycmm.icu/" title="ͳһͼϲ">ͳһͼϲ</a>旉免裂U与凹坑的工艺方法有哪些Q?/p> <p>    在表面没有电镀q的裔R材上q行焊接Ӟ几乎不会发生裂纹和凹坑,但是当对镀锌板或者在铝合金进行焊接时Q却非常Ҏ发生Q特别是当用q大的电焊接Cud量较多的A200pd以及A700pd的杜拉铝以及Mgd量较多的A500pd的汽车用合金Ӟ非常Ҏ产生裂纹?/p> <p>    此外Q不锈钢以及镍合金也被认为是Ҏ发生裂纹的材料?/p> <p>    q种开裂是׃焊接中母材的l晶晶界中R入或者生成了低熔点的金属Q与随着焊接部的冷却而生收~力怺作用而Ş成的Q比如说Q镀锌钢板相对与钢而言Q在晶界中渗入了低熔点的锌,而在Ҏ开裂的铝合金中Q就好像在水中漂着CP半溶解状态的温度范围扩大Q从而出Cq种情况?/p> <p>    因此Qؓ了避免这U裂U以及凹坑、需要尽量减低熔点金属的R入以及生成,可以采用有效的对{有Q不制作寸q大的焊接部Q设定条件以使电极在焊接即结束时向厚板材料方向施加压力挤压焊接部位,使焊接部位缓慢冷_为此Q降低伴随着凝固而生的收羃应力{,具体而言Q不讑֮q大的焊接电倹{设定较高的甉|加压力、设定较长的通电旉以及保持旉、ؓ了防止焊接部急剧冷却而导通后热电、在焊接的后半段增加甉|压力Q施加锻压){?/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; 电话Q?24-31029733 31029732  传真Q?24-62665536  E-mailQ?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P辽ICP?2005499?/p> </td> </tr> </table> <script>(function(){ var src = (document.location.protocol == "") ? 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