Topic
Filler metal
About: Filler metal is a research topic. Over the lifetime, 11152 publications have been published within this topic receiving 86590 citations.
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01 Nov 2008
TL;DR: In this paper, a shielding gas consisting of helium, argon, and CO2 was used, and its effects on the composition of the welding phenomena, such as behaviours of laser-induced plasma generation, molten pool flow, and droplet transfer in gas metal arc welding, were investigated.
Abstract: In carbon dioxide (CO2) laser—gas metal arc hybrid welding, a shielding gas is supplied to isolate the molten metal from the ambient air, suppress the laser-induced plasma, remove the plume out of the keyhole, and stabilize the metal transfer. In this study, a shielding gas consisting of helium, argon, and CO2 was used, and its effects on the composition of the welding phenomena, such as behaviours of laser-induced plasma generation, molten pool flow, and droplet transfer in gas metal arc welding, were investigated. High-speed video observation was used to investigate the welding phenomena inside the arc regime. Consequently, helium was found to have a dominant role in suppressing laser-induced plasma; minimum helium content at a laser power of 8 kW was suggested for laser autogenous and hybrid welding. Argon and CO2 govern the droplet transfer and arc stability. A 12 per cent addition of CO2 stabilizes the metal transfer and eliminates undercut caused by insufficient wetting of molten metal.
28 citations
TL;DR: In this paper, a number of FSW experiments were carried out to obtain the optimum mechanical properties by adjusting the rotational speed to 1000 rpm and welding speed in the range of 14-112 mm/min and with an adjustable offset of the pin location with respect to the butt line.
Abstract: As a solid-state welding technology, friction stir welding (FSW) can join dissimilar materials with good mechanical properties. In this paper, friction stir welding between 304L stainless steel and commercially pure copper plates with thicknesses of 3 mm was performed. A number of FSW experiments were carried out to obtain the optimum mechanical properties by adjusting the rotational speed to 1000 rpm and welding speed in the range of 14-112 mm/min and with an adjustable offset of the pin location with respect to the butt line. Microstructural analyses have been done to check the weld quality. Cross-sectioning of the welds for metallographic analysis in planes perpendicular to the welding direction and parallel to the weld crown was also performed. The mechanical properties of the welds were determined using a combination of conventional microhardness and tensile testing. From this investigation it is found that the offset of the pin is an essential factor in producing defect free welds in friction stir welding of copper and steel.
28 citations
25 Aug 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the effect of the brazing temperature on the interfacial microstructure and joining strength was investigated, and the authors achieved the highest shear strength of 124.6 MPa with 1133 K brazings temperature and 5min holding time.
Abstract: Brazing titanium aluminide to silicon nitride was realized by using inactive AgCu filler metal. The effect of the brazing temperature on the interfacial microstructure and joining strength was investigated. The typical interfacial microstructure of the joint was TiAl/B2 phase/AlCuTi/AlCu2Ti/Ag(s,s) + AlCu2Ti/TiN + Ti5Si3/Si3N4. With an increase of the brazing temperature, the distribution of granular AlCu2Ti intermetallics at the center obviously changed and the thickness of TiN + Ti5Si3 layer adjacent to silicon nitride substrate increased simultaneously. The highest shear strength of 124.6 MPa was achieved with 1133 K brazing temperature and 5 min holding time. In addition, the nucleation of tiny Al3V intermetallics for the precipitation of AlCu2Ti phase was found, which was confirmed beneficial for improving the joining properties.
28 citations
TL;DR: In this article, the influence of various content of Ga on the mechanical properties and microstructure of novel Ag-Cu-Zn-Sn-Ga filler metals was investigated.
28 citations
TL;DR: In this paper, a summarized influence of pulse parameters on the characteristics of bead-on-plate weld deposits of aluminum and Al-Mg alloy, with respect to their geometry and microstructure, has been studied.
Abstract: A summarized influence of pulse parameters have been studied; these parameters are defined by a hypothetically derived factor ϕ = [(I
b
/I
p
)ft
b
] on the characteristics of bead-on-plate weld deposits of aluminum and Al-Mg alloy, with respect to their geometry and microstructure. The weld geometry has been studied in reference to the depth, width, and area of fusion of the base plate, and the bead height, bead width, toe angle, form factor, area of weld deposit, fraction of base metal fusion per unit mass of weld deposition, and dilution. It is found that these aspects of geometry and the microstructure of the weld metal and heat-affected zone (HAZ) vary significantly with a change in the factor ϕ. The value of the factor ϕ at approximately 0.1 has been seen as critical to the change in the different aspects of the pulsed–gas metal arc (P-GMA) weld. It is also found that, at a given ϕ, the variation in mean current and heat input significantly affects the geometry and microstructure of the weld deposit.
28 citations