This mirrors the shift of American industry away from manual activities such as woodworking, sheet-metal work, and welding to more technologically sophisticated work using computer-assisted equipment.
这反映了美国工业从诸如木工艺，板金加工，焊接等体力活到通过计算机辅助设备进行更先进，更有技术含量的操作的转变。
Today, B&J specializes in welding, machine parts and precision sheet metal work.
如今，B&J公司专门从事焊接、机械零件和精密钣金业务。
The reasonable shape of the blank can improve the formability of the sheet metal, make full use of the material, decrease the work of finishing repair.
合理的选择板壳零件的毛坯外形，可以提高板料的可成形性，同时也提高了材料的利用率，减少成形后的修边工作量。
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