激光器发生的光束可以焊接金属。
在焊接金属时所产生的烟雾中，常常包含了少量的锰。
The fumes produced by welding metal often contain small amounts of manganese.
焊接金属波纹管机械密封主要用于炼油厂热油泵的轴封。
The welded metal bellows mechanical seal is largely used for the axial seal of hot oil pump in refinery.
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