我们与有关工厂用闪光对焊焊接的汽车车轮轮圈、自行车轮圈、钢窗及钢门等,在焊缝断口处经常发现有条状或针状物,其颜色发白或亮灰,故称为焊接“白斑”或“灰斑”。一、焊接“白斑”的形成试验结果表明,闪光对焊焊缝断面的“白斑”不是金相组织缺陷,它没有相变过程,用热处理方法能将焊缝断口塑性加以改善,但不能消除“白 We and the factory with the flash welding butt welding wheel rim, bicycle rims, steel windows and steel doors, etc., often found in the weld fracture strip or needle, the color of white or light gray, so Known as welding “white spots” or “gray spots.” First, the formation of welding “white spot” The test results show that flash welding weld cross section of the “white spot” is not a microstructure defect, it does not phase change process, with heat treatment can weld fracture plasticity can be improved, but can not eliminate the " White