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height: 343px;"></p><p>　　①外型：在电路板上，铅焊接材料的表层呈亮乳白色，而无重金属焊接材料呈淡黄色(由于无重金属焊接材料带有铜)。PCBA英语PrintedCircuitBoard+Assembly的通称，换句话说PCB空板历经SMT贴片上件，或历经DIP软件的全部制造，通称PCBA.它是中国常见的一种书写，这被称作官方网习惯用语。假如用力磨擦焊接材料，无重金属焊接材料会在手里留有浅黄色的印痕，而铅焊接材料会留有灰黑色的印痕。</p><p>　　②成分：铅焊接材料是锡和铅的2个主要成分，而无重金属焊接材料成分小于500PPM)，无重金属焊接材料一般带有锡、银或铜元素。</p><p>　　③主要用途：铅商品的电焊焊接有铅焊接材料，常用专用工具和构件为铅。无重金属焊接材料用以出口到国外的无重金属商品，其应用的专用工具和构件务必是无重金属的。</p><p>　　融合这3个层面，我们可以从很多PCBA板中清晰地分辨出选用无重金属焊接方法的PCB板。PCBA加工SMT和DIP加工全是在PCB板上集成化零件的方法，其关键差别是SMT不用在PCB上打孔，在DIP必须将零件的PIN脚插进早已钻好的孔中。</p> </div> <div class="show_pages"> <p>上一篇：<a href="https://web.archive.org/web/20201025165002/http://www.bmtc-smt.cn/xingyedongtai/199.html">SMT贴片加工是什么？</a></p> <p>下一篇：没有了</p> </div> <div class="hot_new"> <div class="page_title clearfix"> <h3>相关新闻</h3> </div> <div class="news_list clearfix"> <ul><li> <a href="https://web.archive.org/web/20201025165002/http://www.bmtc-smt.cn/xingyedongtai/199.html"><span>SMT贴片加工是什么？</span></a> <p>2020-08-03</p> </li> <li> <a href="https://web.archive.org/web/20201025165002/http://www.bmtc-smt.cn/xingyedongtai/198.html"><span>PCBA加工过程铅与无铅的区别是什么？</span></a> <p>2020-07-27</p> </li> </ul></div> </div> </div> </div> </div> <div class="footer"> <div class="center clearfix"> <div class="fl"> <a href="https://web.archive.org/web/20201025165002/http://www.bmtc-smt.cn/"><img src="/web/20201025165002im_/http://www.bmtc-smt.cn/uploads/image/20191029/a0a25f0da58ca92e39ae251392ff45b3.png"></a> <div class="foot_contact"> <p>TEL：13311069586</p> <p>MOB:17326922180</p> <p>EMAIL：1102681275@qq.com</p> <p>公司地址：北京市昌平区马池口镇白浮村七号院六号楼</p> </div> </div> <div class="fr"> <img src="/web/20201025165002im_/http://www.bmtc-smt.cn/uploads/image/20200609/34aa4ea6bb0a9c8280b61243ba8f28dc.jpg"><span>微信二维码</span> </div> </div> </div> <div class="right_fix"> <div class="text clearfix"> <ul><li> <div class="pic"> <img class="img1" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix1.png"><img class="img2" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix1.png"><span>产品搜索</span> </div> <div class="text1"> <div class="search clearfix"> <form action="https://web.archive.org/web/20201025165002/http://www.bmtc-smt.cn/search/" method="post"> <input class="inp1" type="text" name="key" placeholder="请输入产品名称"><input class="btn_sub" type="submit" name="" value=""></form> </div> </div> </li> <li> <div class="pic"> <a target="blank" href="https://web.archive.org/web/20201025165002/http://wpa.qq.com/msgrd?v=3&uin=123456789&site=qq&menu=yes"> <img class="img1" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix2.png"><img class="img2" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix2.png"><span>在线咨询</span> </a> </div> </li> <li> <div class="pic"> <img class="img1" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix3.png"><img class="img2" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix3.png"><span>二维码</span> </div> <div class="text"> <img src="/web/20201025165002im_/http://www.bmtc-smt.cn/uploads/image/20200609/34aa4ea6bb0a9c8280b61243ba8f28dc.jpg"></div> </li> <li class="btntop"> <div class="pic"> <img class="img1" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix4.png"><img class="img2" src="/web/20201025165002im_/http://www.bmtc-smt.cn/template/default/index/img/fix4.png"><span>返回顶部</span> </div> </li> <script type="text/javascript"> $('.btntop').click(function(){ $('body,html').animate({ scrollTop: 0 },500); 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