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SMT PCBA贴片外观检验标准(二)

发布时间:2020-01-03 编辑作者:金致卓 阅读:426

BULIANGHANDIANDEQUEXIANGENBENYUANYINJIGAISHANCUOSHIBIAOZHUNHANDIANDEYAOQIU: 

1、KEKAODEDIANQILIANJIE 2、ZUGOUDEJIXIEQIANGDU 3、GUANGHUAZHENGQIDEWAIGUAN

捕鱼游戏攻略 (1)BULIANGSHUYU 

DUANLU: BUZAITONGYITIAOLUXIANDELIANGGEHUOYISHANGDEDIANXIANGLIANBINGCHUZAIDAOTONGZHUANGTAI。QIPI:LUXIANTONGBOYINGUOFENYUREHUOWAILIZUOYONGERTUOLILUXIANDIBAN。SHAOXI:HANPANBUWANQUAN,HUOHANDIANBUCHENGBOFENGZHUANGBAOMAN。JIAHAN:HANXIBIAOMIANKANSHIBOFENGZHUANGBAOMAN,XIANGUANGZE,DANSHIZHISHANGBINGWEIYULUXIANTONGBOXIANGRONGHUAHUOWEIWANQUANRONGHUAZAILUXIANTONGBOSHANG。TUOHAN:YUANJIANJIAOTUOLIHANDIAN。XUHAN:HANXIZAIYINXIANBUYUYUANJIANTUOLI。JIAOHAN:YINGUOFENJIARESHIZHUHANJIDIUSHIDUOYINQIHANXILAJIANXIANXIANG。LAJIAN:YINZHUHANJIDIUSHIERSHIHANDIANBUYUANHUA,XIANDEWUGUANGZE。YUANJIANJIAOZHANG:YUANJIANJIAOLUCHUBANDIDEZHANGDUANCHAOGUO1.5-2.0mm。MANGDIAN:YUANJIANJIAOWEICHACHUBANMIAN。

(2)BULIANGXIANXIANGXINGCHENGYUANYIN,XIANXIANHEGAISHANCUOSHI 

1、JIARESHIJIANWENTI 

(1)加热時间不够:会使焊料不能充分侵润焊件而形成松脂夹渣而虚焊。(2)加热時间过长(过量加热),pcba贴片捕鱼游戏攻略除有可能导致元器件损坏之外,还有如下危害和外部特征。A、点焊外观变差。如果焊锡已经侵润焊件以后还继续进行过量的加热,将使助焊液全部挥发完,导致熔态焊锡过热。当电烙铁离开时容易拉出锡尖,同时点焊表面发白,出现粗糙颗粒,失去光泽。B、高温导致所加松脂助焊液的分解碳化。松脂一般在210度开始分解,不仅失去助焊液的作用,而且导致点焊夹渣而形成缺陷。如果在焊接中发现松脂发黑,肯定是加热時间过长所致。C、过量的受热会毁坏印制板上铜箔的粘合层,导致铜箔焊盘的剥落。因此,在适当的加热時间里,准确掌握加热熟度是优质焊接的关键。

捕鱼游戏攻略 (3)BULIANGDIANHANCHENGYINJIYINHUAN 

捕鱼游戏攻略 1、SONGZHICANLIU:XINGCHENGZHUHANYEDEBOMO。

YINHUAN:DAOZHIDIANQISHANGDEJIECHUBULIANG。YUANYINFENXI:DIANLUOTIEGONGLVBUGOUHANJIESHIJIANDUANYINXIANHUODUANZIBUGANJING。2、XUHAN:BIAOMIANCUCAO,MEIYOUGUANGZE。YINHUAN:JIANSHAOLEDIANHANDEJIXIEQIANGDU,JIANGDICHANPINSHOUMING。YUANYINFENXI:HANXIGUHUAQIAN,YONGQITADONGXIJIECHUGUODIANHANJIAREGUODUZHONGFUHANJIECISHUGUODUO 

捕鱼游戏攻略 3、LIEHAN:DIANHANSONGDONG,DIANHANYOUFENGXI,QIANYINXIANSHIDIANHANSUIZHIHUODONG。YINHUAN:DAOZHIDIANQISHANGDEJIECHUBULIANG。YUANYINFENXI:HANXIGUHUAQIAN,YONGQITADONGXIJIECHUGUODIANHANJIAREGUOLIANGHUOBUGOUYINXIANHUODUANZIBUGANJING。4、DUOXI:HANXILIANGTAIDUO,LIUCHUDIANHANZHIWAI,BAOGUOCHENGQIUZHUANG,RUNSHIJIAODAYU90DUYISHANG。YINHUAN:YINGXIANGDIANHANWAIGUAN,KENENGCUNZAIZHILIANGYINHUAN,RUDIANHANNEIBUKENENGYOUKONGDONG。YUANYINFENXI:HANXIDELIANGGUODUOJIAREDESHIJIANGUOZHANG。5、LAJIAN:DIANHANBIAOMIANCHUXIANNIUJIAOYIYANGDETUCHU。YINHUAN:RONGYIDAOZHIXIANLUDUANLUXIANXIANG。YUANYINFENXI:DIANLUOTIEDECHELIFANGFABUDANGJIARESHIJIANGUOZHANG。6、SHAOXI:HANXIDELIANGGUOSHAO,RUNSHIJIAOXIAOYU15DUYIXIA。

YINHUAN:JIANGDILEDIANHANDEJIXIEQIANGDU。YUANYINFENXI:YINXIANHUODUANZIBUGANJING,YUGUADEHANXIBUGOU,HANJIESHIJIANGUODUAN。7、YINXIANCHULIBUDANG:DIANHANCUCAO,SHAOJIAO,YINXIANXIANRU,XINXIANLUCHUGUODUO。YINHUAN:DIANQISHANGJIECHUBULIANG,RONGYIDAOZHIDUANLU。YUANYINFENXI:HUICHENHUOSUIXIEJILEIDAOZHIJUEYUANBULIANGGAICHUBEIJIARESHIJIANGUOZHANG,YINXIANKUNZHABULIANG。8、JIEXIANDUANZIJUEYUANBUFENSHAOJIAO:HANJIEJINSHUCAILIAOGUORE,YINQIJUEYUANBUFENSHAOJIAO。YINHUAN:RONGYIDAOZHIDUANLUDEYINHUAN。YUANYINFENXI:JIARESHIJIANGUOZHANGHANXIJIZHUHANYEDEFEISAN。

捕鱼游戏攻略 (4)BULIANGHANDIANDEDUICE 

1、LAJIAN 

CHENGYIN:JIARESHIJIANGUOZHANG,ZHUHANJIXUQIULIANGGUOSHAO,TUOXISHIJIAOBUZHENGQUE。DUICE:DIANHANHANJIESHIJIANKONGZHIZAI3MIAOZUOYOU,TIGAOZHUHANJIDEXUQIULIANG,TUOXISHIJIAOWEI45DU。2、KONGDONG、ZHENKONG 

CHENGYIN:YUANJIANYINXIANMEIYUGUAXI,SHIYINXIANZHOUWEICHANSHENGKONGDONG,PCBBANFANCHAO 

捕鱼游戏攻略 DUICE:SHIDANGYANZHANGDIANHANHANJIEDESHIJIAN,DUIYINJIAOKONGQIYANGHUADEJINXINGJIAXIYUTUFUCHULI,DUIFANCHAOPCBJINXINGHONGBAN。3、DUOXI 

CHENGYIN:WENDUGUOGAO,HANXISIXUQIULIANGDUO,HANXISISHIJIAOWEIZHANGWOHAO。DUICE:SHIYONGSHIHEDELUOTIE,DUILUOTIEDEWENDUJINXINGGUANLI,SHIDANGJIANSHAOHANXISIDEXUQIULIANG,SHIJIAOWEI45DU。4、LENGHAN 

捕鱼游戏攻略 CHENGYIN:DIANHANHANJIEHOU,HANXISIWEILENGQUEGUHUAQIANBEIHUANGDONGHUOZHENDONG,SHIHANXISIXIACHUIHUOCHANSHENGYINGLIWEN 

DUICE:DAIHANDIANWANQUANLENGQUEHOU,ZAIJIANGPCBBANLIURUXIAYIGONGWEI。5、RUNSHIBULIANG 

CHENGYIN:HANPANHUOYINJIAOKONGQIYANGHUA,DIANHANHANJIESHIJIANGUODUAN,TUOXISUDUGUOKUAI。

DUICE:DUIKONGQIYANGHUADEHANPANHUOYINJIAOJINXINGJIAXIYUTUFUCHULI,SHIDANGJIANMANDIANHANHANJIEDESUDU,DIANHANHANJIESHIJIANKONGZHIZAI3MIAO。6、LIANHAN 

捕鱼游戏攻略 CHENGYIN:YINHANXISILIUDONGXINGCHA,SHIQITAXIANLUDUANLU。DUICE:DIANHANHANJIESHISHIYONGSHIDANGDEZHUHANJI,DIANHANHANJIESHIJIANKONGZHIZAI3MIAOZUOYOU,SHIDANGTIGAODIANHANHANJIEWENDU。

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