摘要
对１ｍｍ厚５０３０铝合金的激光可焊性进行了研究。通过对焊接条件、焊缝熔化区的各种情况及其Ｍｇ含量等关系的分析，得出在熔化区显微硬度的下降主要是由Ｍｇ的蒸发损失使其含量下降所致；当热输入不是太大时，其微观结构主要是胞状树枝晶的一次和二次组织，一次晶间距均小于６μｍ；当热输入过大时，熔化区中央出现等轴晶。焊缝热影响区宽度与热输入有关，当焊速在１．２ｍ／ｍｉｎ以上时，其宽度小于２００μｍ。
The laser welding of aluminum alloy 5030 plate with thickness of l.0 mm is in-vestigated. Through the analysis of the relationship between welding parameters and the-conditions of weld fusion zone as well as the Mg content in there ,it is found that the de-creasing of microhardness of weld fusion zone is due to the decreasing of Mg content causedby its evaporation. The microstructure of the weld is basically primary and secondary dendri-cal structure when power input is not too large. The interval of primary dendrite is less than6 μm. When power input becomes excessively large,equiaxial grains appears at the center offusion zone.The width of thermal influence zone of the weld is affected by the power input.It will be less than 200μm when welding velocity is greater than l.2m/min.
出处
《甘肃工业大学学报》
1994年第3期7-12,共6页
Journal of Gansu University of Technology
关键词
铝合金
激光焊接
显微硬度
aluminum alloy
laser welding
microscopic segregation
solidification crack
evaporation
porosity
wall focus effect
microhardness
