6N01铝合金水冷MIG焊接头组织和性能

针对6N01铝合金熔化焊接头软化问题,研究了水冷对MIG焊接头组织和性能的影响,并与自然冷却条件下接头进行对比.金相试验结果表明,水冷使填充和盖面焊道部分熔化区变窄,焊缝近熔合线的柱状晶区变宽,焊缝内部等轴晶细化;显微硬度试验结果表明水冷条件下接头软化区范围明显变窄且硬度提高;软化区TEM观察显示水冷减少了β'析出相长大;水冷还提高了MIG焊接接头屈服强度和抗拉强度.结果表明,水冷能优化6N01铝合金MIG接头组织并提高力学性能.     

Modeling the radiometric imaging process of weld pool

In the vision monitoring or controlling the arc welding process, it is a prerequisite to get a clear image of weld pool. However, the disturbance of arc radiation makes imaging of weld pool difficult and optical filters are usually used to improve the image quality. In this paper, a radiometric imaging model is established to investigate the influence of the filter on the image quality of the weld pool, in which the spectral distribution of weld pool radiation, the spectral transmittance of the filter, the spectral sensitivity of the camera are all considered. With the proposed model, the influence of the factors on weld pool imaging can be inferred and the selection of optical filters is discussed.     

不同冷却方式对7系铝合金MIG焊接头组织和力学性能的影响

对12 mm厚7系铝合金板材进行MIG焊接,焊接后采用自然冷却与循环水冷却两种冷却方式,分析水冷对焊接接头组织和力学性能的影响。结果表明,与自然冷却相比,水冷使打底、填充、盖面焊道中心等轴晶粒尺寸减小,焊缝边缘处柱状晶尺寸明显变大;焊缝处硬度有所提高,焊缝-侧软化区范围明显减小,焊接接头屈服强度明显下降,抗拉强度有所提高。