成人免费看WWW网址入口,国产裸拍裸体视频在线观看 ,久久AⅤ无码AV高潮AV喷吹,女警乳链乳环蒂环铃铛调教

在線客服
您好,歡迎來到廣東臺(tái)錫金屬工業(yè)有限公司官方網(wǎng)站!

收藏本站

全國咨詢熱線0769-81665388

熱門搜索>>無鉛錫條,無鉛錫絲,環(huán)保錫條,環(huán)保錫絲,錫的價(jià)格,

當(dāng)前位置:首頁 » > 焊錫技術(shù) » Leaded wave soldering copper (Cu) impurities in the management of

Leaded wave soldering copper (Cu) impurities in the management of

文章出處: 發(fā)布時(shí)間: 2011年5月22日 人氣 5659

In the practical application of lead solder in the solder on copper (Cu) content of electronic technology and solder materials engineering profession have reached a consensus: tin-copper (Cu) content should be controlled about 0.15%, when the tin solder copper furnace (Cu) content of more than 0.15%, the incorporation of new material must be diluted copper content, while copper (Cu) content reached 0.3%, then the whole tin furnace solder to be replaced and the clear result of the furnace, re-join the new material. 400KG tin stove for a run, if the dilution process to take, more than 100KG need to add new material, or fail to reduce copper (Cu) results.