No abstract

This study focuses on the usage of fly-ash and Al-12%Si as diffusive coating materials over AISI 304 steel welded with AA 6061 in friction stir welding process to improve the joint quality. Various mechanical and metallurgical studies have been carried out to evaluate the characteristics of the weld, and investigate and compare the effect of the two coating materials. Formation of intermetallic reaction layer has been found to be an influential parameter affecting the joint quality. Aluminium-rich intermetallic reaction layer has been observed in the bare welds, whereas the coated samples have been found to have ferrous-rich intermetallic reaction layer.

No abstract

Aluminium and copper (Al-Cu) busbar is widely used as a core component in Lithium-Ion (Li-ion) batteries. The Al-Cu busbar is challenging to fabricate with the traditional welding processes because of its high thermal conductivity. In the present study, the Al-Cu busbar is fabricated using the friction stir welding method. The effect of temperature and vibration generated during the welding process on the formation of intermetallic compounds (IMCs) is studied by using the effective formation model and found that Al2Cu is the first to form at the interface. The IMC formation at the joint interface had both detrimental (Al-rich IMC) and beneficial (Cu-rich IMC) effects. The presence of detrimental IMCs affects the joint strength of about 36 % as compared to the sample with the highest tensile load. The surface electrical conductivity is measured by using a Gaussian profile method and found in the range of 0.94 – 5.37 μ Ω·mm. The welded samples with the presence of Al2Cu3 and Al4Cu9 IMC at the interface are found to have higher electrical conductivity. Interestingly, the sample with a higher tensile load had observed higher electrical conductivity due to the formation of Cu-rich IMC, i.e., Al4Cu9.

No abstract