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<span style="font-size:16px;">焊盘设计与布局不合?如果焊盘设计与布局有以下缺?会引vSMT贴片两边的湿润力不^?</span> </p> <p> <span style="font-size:16px;">元g的两边焊盘之一与地U相q接或有一侧焊盘面U过?焊盘两端热容量不均匀;</span> </p> <p> <span style="font-size:16px;">SMT贴片表面各处的温差过大以致元件焊盘两边吸热不均匀;</span> </p> <p> <span style="font-size:16px;">大型器gQFP、BGA、散热器周围的小型片式元件焊盘两端会出现温度不均匀.</span> </p> <p> <span style="font-size:16px;">解决办法:改变焊盘设计与布局.</span> </p> <p> <span style="font-size:16px;">焊锡膏与焊锡膏印刷存在问?焊锡膏的zL不高或元g的可焊性差,焊锡膏熔化后,表面张力不一?引L盘湿润力不^?两焊盘的焊锡膏印刷量不均匀,多的一边会因焊锡膏吸热量增?融化旉滞后,以致湿润力不q.</span> </p> <p> <span style="font-size:16px;">解决办法:选用zL较高的焊锡?改善焊锡膏印刷参?特别是模板的H口寸.</span> </p> <p> <span style="font-size:16px;">贴片UMZ轴方向受力不均匀,会导致元件浸入到焊锡膏中的深度不均匀,熔化时会因时间差而导致两边的湿润力不q.如果SMT贴片UM会直接导致立?</span> </p> <p> <span style="font-size:16px;">解决办法:调节贴片机工艺参?</span> </p> <p> <span style="font-size:16px;">炉温曲线不正如果回焊炉炉体过短和温区太少׃造成对PCB加热的工作曲U不正确,以致杉K上湿差过?从而造成湿润力不q.</span> </p> <p> <span style="font-size:16px;">解决办法:Ҏ每种不同产品调节好适当的温度曲U?</span> </p> <p> <span style="font-size:16px;">氮气回流焊中的氧度采取氮气保护回流焊会增加焊料的湿润力,但越来越多的例证说明,在氧气含量过低的情况下发生立的现象反而增?通常认ؓ氧含量控制在(100?00)×10的负6ơ方左右最为适宜?/span> </p> <p style="text-align:center;"> <span style="font-size:16px;"><img src="http://www.tbmawdfy.cn/uploads/news/20180305061057.jpg" width="500" height="309" title="SMT贴片" align="" alt="SMT贴片" /><br /> </span> </p></p> </div> <div class="gduo"> <div>上一?<a href="39.html">比利时客h访宏力通SMT贴片车间</a></div> <div>下一?<a href="37.html">深圳SMT贴片厂家再次q来英国布勒团队来访</a></div> </div> </div> <div class="info_key"> <span>相关标签Q?/span><a href='/key.aspx?k=SMT%cc%f9%c6%ac'>SMT贴片</a>,<a href='/key.aspx?k=%c9%ee%db%daSMT%cc%f9%c6%ac'>深圳SMT贴片</a>,<a href='/key.aspx?k=%c9%ee%db%daPCBA'>深圳PCBA</a>, </div> <div class="n_info_con2"> <h4 class="t04">相关产品</h4> <div class="info_b"> <dl class="sear_dl"> <dt class="dt2"> <a rel="nofollow" href="/supply/45.html"><img src="http://cmsimgshow.zhuchao.cc/30898/201903071536319033089810246.jpg?path=www.tbmawdfy.cn/uploads/cp/201903071536319033089810246.jpg" 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