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In Situ Evaluation of the Joining Defects in a Pb-Free Soldered Joint

机译：原位评估PB无焊接接头中的连接缺陷

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Conventionally, brass has toughness more than other metals, so there is a concern about its poor machinability. Therefore, improvement of machinability was attempted by adding lead to brass. This brass called free cutting brass, typified by JIS C3771. This free-cutting brass is used for piping components and machine parts. There is a concern about elution of the lead into drinking water. Hence, Drinking Water Quality Standards Law has been amended and it restricts lead content in the free cutting brass. Therefore, lead-free free-cutting brass with no lead or minimized content of lead is required. Consequently, a lead-free free-cutting brass had been developed to improve in machinability such as JIS C6931 and JIS C6803 that are added Si and Bi instead of lead respectively. Lead was also used for the solder for joining among pure copper pipes and brass valves. That causes elution of lead from the solder into drinking water. For this reason, Lead-free solder such as Sn-Sb and Sn-Ag-Cu have been used. A fire torch technology often was used for soldering of brass. The purpose of this study is investigating soldering-ability and wettability of lead-free solder on lead-free free-cutting brass. Hence, we investigated the soldering ability of lead-free solders, Sn-5%Sb and Sn-3%Ag-0.5%Cu, for pure Cu and brass joints with nonuniform heating by hot plate.
机译：传统上，黄铜比其他金属更加韧性，因此对其可加工性差有担忧。因此，通过添加导致黄铜来尝试改善可加工性。这款黄铜称为自由削减黄铜，典型化为JIS C3771。这种自由削换黄铜用于管道部件和机器部件。有人担心将导线洗脱到饮用水中。因此，修改了饮用水质量标准法，它限制了自由削减黄铜中的铅含量。因此，无铅自由切削黄铜无铅或最小化铅含量。因此，已开发出无铅的自由切削黄铜以改善可加工性，例如JIS C6931和JIS C6803分别添加SI和BI而不是铅。铅也用于焊料中用于加入纯铜管和黄铜阀。这导致从焊料中的铅笔洗脱到饮用水中。因此，已经使用了无铅焊料，例如Sn-Sb和Sn-Ag-Cu。火炬技术经常用于黄铜的焊接。本研究的目的正在在无铅自由削方黄铜中调查无铅焊料的焊接能力和润湿性。因此，我们研究了无铅焊料，Sn-5％Sb和Sn-3％Ag-0.5％Cu的焊接能力，用于纯Cu和黄铜接头，通过热板不均匀加热。

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