Weldy韦尔迪weldv.焊接；使结合n.焊接；焊缝welded bonnet[化] 焊接阀盖weld assembly焊接结构,焊接组件welding layer焊层Welding fault焊接缺陷welding steel焊钢welding stick焊丝,焊条welding power焊接电源welding track焊缝跟踪welding flash弧光灼伤welding apron焊工围裙,焊工的围裙

1. Metallographic analyses show that the ultrasonic welding significantly refines the grains with more acicular ferrite appears in the fusion zone.
   金相分析表明，在电弧超声作用下，焊缝结晶组织明显细化，焊缝区针状铁索体增加。