Filler metal

About: Filler metal is a research topic. Over the lifetime, 11152 publications have been published within this topic receiving 86590 citations.

Aluminium to steel resistance spot welding with cold sprayed interlayer

Abstract: Studies on bonding of aluminium alloys to steels are popular because these are structural materials widely used in a variety of industries. However, joining these dissimilar materials is difficult mainly because of the formation of brittle intermetallic compounds. This paper presents a study on welding aluminium to steel by resistance spot welding. Before the welding, steel surface was covered by cold spraying with the layer of aluminium, nickel and nickel–aluminium. This way, instead of the welding of dissimilar materials, the welding of aluminium to aluminium (or nickel) layer pre-deposited on the steel sample was performed. The feasibility of using interlayers for improving the welding of dissimilar materials was tested using SEM, EDX and XRD. Mechanical properties of welds were investigated by microhardness and shear strength tests. The results showed that the coating allowed to decrease hardness in the welding zone and to increase the shear strength of the weld.

The influence of base metal grain size on isothermal solidification during transient liquid-phase brazing of nickel

Abstract: The influence of base metal grain size on isothermal solidification during transient liquid-phase brazing with Ni-11 wt% P filler metal has been investigated. Single-crystal, coarse-grained and fine-grained nickel base metal were brazed at 1150‡C for various holding times. The eutectic width decreased linearly with the square-root of the brazing time in single-crystal, coarse-grained and fine-grained nickel base metals. The completion time for isothermal solidification decreased in the order single-crystal, coarse-grained and fine-grained nickel base metal. The difference in isothermal solidification rates produced when brazing the different base metals is explained qualitatively by the influence of base metal grain boundaries on the apparent mean diffusion coefficient of phosphorus in solid nickel.

Comparison between hybrid laser-MIG welding and MIG welding for the invar36 alloy

Abstract: The invar36 alloy is suitable to produce mold of composite materials structure because it has similar thermal expansion coefficient with composite materials. In the present paper, the MIG welding and laser-MIG hybrid welding methods are compared to get the more appropriate method to overcome the poor weldability of invar36 alloy. According to the analysis of the experimental and simulated results, it has been proved that the Gauss and cone combined heat source model can characterize the laser-MIG hybrid welding heat source well. The total welding time of MIG welding is 8 times that of hybrid laser-MIG welding. The welding material consumption of MIG welding is about 4 times that of hybrid laser-MIG welding. The stress and deformation simulation indicate that the peak value of deformation during MIG welding is 3 times larger than that of hybrid laser-MIG welding.