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Lead-Free Plumbing Solder: Tin with 0.7 % Copper, Cast in Bars
Lead has been banned from drinking-water plumbing solder in the US since 1974; tin with a little copper took its place. Tin with 0.7 % copper melts at 227 °C, higher than the old tin-lead. Melt the tin, dissolve the copper in it and cast it into bars, the thick form plumbers use.
The picture: soldering a copper pipe joint with a torch.
中级
Two hours
说明
1
1
Weigh
Weigh
Weigh 99.3 parts tin to 0.7 parts copper (step 5). Cut the copper wire into short pieces.
此步骤所需材料：
锡锭993 克
铜线7 克所需工具：
等臂天平
铁皮剪2
2
Melt and alloy
Melt and alloy
Melt the tin in an iron crucible on the forge hearth under a thin layer of charcoal dust (ours). Drop in the copper pieces and stir with an iron rod, keeping it hot, until no copper is left undissolved.
所需工具：
铸铁坩埚
炉膛（锻火）
木炭
铁棒
坩埚钳
电焊手套
安全眼镜3
3
Cast bars
Cast bars
Skim off the charcoal and pour the alloy into a warmed ingot mould. Knock the bars out when cold.
所需工具：
锭模坩埚钳电焊手套安全眼镜4
4
Label
Label
Scratch a mark on each bar so it is never mixed with lead solder.
所需工具：
铁棒5
5
Tin and copper
Tin and copper
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