窄间隙电渣焊    narrow-gap electroslag welding

窄间隙埋弧焊    narrow-gap submerged arc welding

窄间隙焊    narrow-gap welding

数控切割    NC (numerical-control) cutting

数控切割机    NC cutting machine

中性焰    neutral flame

镍基合金焊条    nickel base alloy covered electrode

镍当量    nickel equivalent

氮弧焊    nitrogen-arc welding

标定卫生空气需要量    nominal hygienic air requirement

不熔化电极    nonconsumable electrode

无损检验    nondestructive test

异步断续器    non-synchronous contactor

非转移弧    nontransferred arc

非转移弧电源    nontransferred arc power supply

非真空电子束焊机    nonvacuum electron beam welder

垂直碰撞    normal impact

缺口弯曲试验    notch bend test

熔核    nugget

返修次数    number of rewelding