Brazability of Aluminum Alloy to Steels using Aluminum Filler Metal -Dissimilar Laser Brazing of Aluminum Alloy and Steels (Report 1)-

Abstract

Dissimilar diode-laser brazing of A5052/IF steel and A5052/SUS304 has been conducted using BA4047 filler metal with Nocolock flux KAlF4+K3AlF6 . The processing parameters such as laser power, wire feeding speed and travel speed were varied while defocusing distance and shielding gas Ar flow rate were constant. Strength of lap joints of A5052 on steels was evaluated by tensile shear test. Fracture strength of A5052/steels joints was increased with increasing laser power and reached the maximum strength more than about 80% of the A5052 base metal strength at laser power of 1300 W. Fracture position shifted from at the A5052/braze layer interface to at the steels/braze layer interface with increasing laser power. The voids and incomplete penetration of filler metal were observed at the A5052/braze layer interface when the laser power was below 1100 W. The Fe-Al intermetallic compounds were formed at the steels/braze layer interface and grew drastically when the laser power exceeded 1300 W. The superior brazability of A5052/steels was indicated at the brazing conditions corresponded to the temperature of melted droplet of BA4047 filler metal being 1050-1250 K during laser brazing process.

Interfacial Microstructure and Mechanical Properties of Fluxless Arc Brazing of Aluminum Alloy to Steel with the Aid of Milling

“…During the solid-liquid interface reaction, the interfacial compounds dissolved and regenerated simultaneously, and the growth rate of the non-formed interfacial compounds is much lower than the dissolution rate of the interfacial reaction products. 23) In short, with the further increasing on a e , a large number of voids and thicker IMC layer were easy to form near interface, which would reduce the interfacial shear strength.…”

Research on laser welding-brazing of dissimilar Mg alloy and stainless steel

“…The appearance of the intermetallic compounds Mg 17 A l2 and Mg 2 Ni indicates that the reactive diffusion plays an important role in the formation of transition zone. Generally, the thickness of reactive diffusion layer along the interface is estimated by the following formula [16,24]: …”

Characteristics of TIG arc-assisted laser welding–brazing joint of aluminum to galvanized steel with preset filler powder

“…Consequently, an intermetallic layer develops at the interface between steel and Al alloy. Formation of the IMCs layer is constrained by the temperature and time of the liquid-solid reaction [18]. Figure 8 shows that compared with the single laser weldingbrazing thermal cycle curve, the residence time of high temperature is long and the cryogenic cooling speed is slow in the TIG-assisted arc welding.…”