Filler metal

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

Brazing 6061 aluminum alloy with Al-Si-Zn filler metals containing Sr

Abstract: Al-6.5Si-42Zn and Al-6.5Si-42Zn-0.09Sr filler metals were used for brazing 6061 aluminum alloy. Air cooling and water cooling were applied after brazing. Si phase morphologies in the brazing alloy and the brazed joints were investigated. It was found that zinc in the Al-Si filler metals could reduce the formation of eutectic Al-Si phase and lower the brazing temperature at about 520°C. Adding 0.09wt% Sr element into the Al-6.5Si-42Zn alloy caused α-Al phase refinement and transformed acicular Si phase into the finely fiber-like. After water cooling, Zn element dissolved into the Al-Si eutectic area, and η-Zn phase disappeared in the brazed joints. Tensile strength testing results showed that the Sr-modified filler metal could enhance the strength of the brazed joints by 13% than Al-12Si, while water-cooling further improved the strength at 144 MPa.

Influences Of Welding Processes And Post- Weld Ageing Treatment On Mechanical And Metallurgical Properties Of Aa2219 Aluminium Alloy Joints

Abstract: AA2219 aluminium alloy joints without filler metal addition were fabricated using gas tungsten arc welding (GTAW), electron beam welding (EBW) and friction stir welding (FSW) processes. The fabricated joints were post weld aged at 175 °C for 12 h. Microstructure analysis was carried out using optical and electron microscopes. It was found that the FSW joints were exhibiting superior tensile and fatigue properties compared to EBW and GTAW joints. Post-weld ageing treatment was found to be beneficial to enhance the tensile and fatigue properties of the welded joints, irrespective of welding processes. Post weld aged FSW joints showed the highest joint efficiency of 80 % and hence this process can be preferred over other welding processes to fabricate components and structures using AA2219 aluminium alloys.

Microstructure and kinetics of induction brazing TiAl-based intermetallics to steel 35CrMo using AgCuTi filler metal

Abstract: TiAl-based intermetallics joined by vacuum induction brazing using Ag–Cu35.2–Ti1.8 filler alloy at 850–970 °C for 1–10 min was investigated. The interfacial microstructure and reaction kinetics across the brazed joint were comprehensively evaluated. The interfacial microstructure of brazed joints is TiAl/AlCuTi(TiCu)/AlCu2Ti(TiCu)/Ag solid solution/AlCu2Ti(TiCu)/TiC/35CrMo. According to the experimental observations, silver would not react with the TiAl substrate, but copper reacted strongly with the TiAl substrate, forming continuous reaction layer. The degree of interfacial reaction of TiAl/Ag–Cu35.2–Ti1.8 is related to the configuration of AlCu2Ti reaction layer and the amount of TiAl/Ti3Al phase interface in the TiAl substrate under the same technological conditions. The configuration and the size of AlCuTi phase have relation to the configuration and the amount of TiAl/Ti3Al lamellar colony. The visible acicular AlCuTi phase can be generated by the approximate lamellar structure with low Al content, which is beneficial to the joining of the TiAl substrate.

Welding method, filler metal composition and article made therefrom

Abstract: A weld filler metal alloy composition and a method for welding stainless steel components into a final assembly includes the steps of: austenitizing the stainless steel components to be welded at a temperature of 1800°F-2000°F; applying, using conventional arc welding techniques a solid wire of the filler metal alloy comprising in % by weight: up to 0.02% carbon; up to 0.8% manganese; up to 0.02% phosphorus; up to 0.015% sulfur; up to 0.6% silicon; 4.5-5.5% nickel; 0.4-0.7% molybdenum; 10-12.5% chromium; up to 0.1% copper; balance essentially iron and incidental impurities; and tempering the welded assembly welded at a temperature of 930°F -1300°F. A second tempering step conducted at a temperature of 1095°F-1145°F may follow. The welding method can be used to make compressor impellers (6). The compressor impeller components comprise 13Cr-4Ni stainless steel.