旧的家庭用的是铅管，但是即使是新的无铅水管装置在焊接接头的铜管件或水龙头或铜管中也含有铅。
Older homes may have lead pipes, but even new plumbing that's lead free can still contain lead in brass fitting or faucets or in copper pipes with soldered joints.
结果表明，当焊接工艺参数合适时，可以获得表面成形良好、无变形的铝合金与钢的对接接头和搭接接头。
The results shown that a deformation-free joint with good weld surface appearance can be obtained with suitable welding conditions for butt-joint and lap-joint of the dissimilar materials.
经拍片和机械强度检验，证明焊接接头无内部缺陷并符合技术要求。
The photograph and mechanical robustness tests show that the welding joints have no internal defects and accord with the technical requirements.
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