Aluminum and its alloys in industrial production and social life has been used widely, because the proportion of small, good electrical and thermal conductivity, casting and machining of quality aluminum materials in modern industry's important role is irreplaceable.

Compared with black metal, aluminum welding more difficult, especially in hard aluminum, super-hard aluminum and cast aluminum. Poor welding of aluminum is mainly manifested in the oxide film is difficult to remove.

Barton Welding Institute of Ukraine in the early 1960s when the invention of the active titanium welding flux, was coated with a thin layer on the metal mixture, coating the main role is to compress the arc, rather than the chemical reaction of the bath. U.S. Edison Welding Institute (EWI) in the 1990s the development of active flux, and the Navy connection center (NJC), with funding from the EWI and some other members of the assessment process, the current flux in the United States has a commercial activity on the application. TWI Welding Cable Institute UK has applied to start the core activity of flux as basic research studies.

The main role of reactive flux compression arc, rather than the chemical reaction of the pool, but also the use of flux activity broken or aluminum oxide film is feasible. Aluminum-cored solder wire is, itself contains some active elements, these elements can play a role in flux.

Reducing agent and the reaction product of Al2O3 is AlCl3 and AlxFy, AlCl3 can evaporate into a gas, AlCl3 evaporation process also broken Al2O3 thin films; AlxFy is a compound salt, good fluidity, density less than aluminum, floating on the weld surface and edge of the light gray color.

Use of aluminum-cored wire welding aluminum can save energy, improve production efficiency, particularly in enhancing the quality of the weld with remarkable success. Based on aluminum-cored Welding Wire for TIG welding process is polar, with the traditional AC TIG welding compared to many advantages, such as weld appearance, smooth, melt deeply, less slag, almost no holes and so on.

1 cored aluminum wire manufacturing technology

Aluminum-cored wire manufacturing technology can learn from the steel flux cored wire manufacturing method, the steel flux cored wire manufacturing process consists of rolling, drawing, and post-processing layer around several processes. Seamless flux cored wire for the raw materials into a plate of steel, seamless steel pipe can also be a welded steel pipe.

Tubular cored electrode manufacturing method is to first mix cored powder sintering sintering flux form, then fill in the pipe (16-25mm) through the vibration of the cored fill real, then by rolling, rough drawing, annealing, small pull , copper, and other processes in the system layer around the finished product. Course of the study have tried this method, the reducing agent into the aluminum in the alloy powder, rolling - drawing - diffusion annealing, the final formation of tubular electrode. The main problem is low productivity, powder filling factor of instability.

Casting is to restore the powder into aluminum ingots, fully formed cored tablet compaction. The first step to solder made of porous cast blank, and then immersed in the honeycomb blank activity flux solution, immersed in the solution in the blank spaces. Ingot to cool before squeezing. The process of this method lies in the pre-activated flux and add process.

Mechanical alloying powder metallurgy method is based on the principle of mixing the powdered raw materials, pressing, extrusion. The process is to restore the powder, aluminum powder, metal powder, well mixed add the other, to a certain temperature mixed metal powder under pressure, to form a certain strength of powder tablets, in a controlled atmosphere, heat, and pressure to powder ingot form a "brazing ingots," and finally become useful and extrusion die drawing method with reduced roll diameter.

Laminar flow is the use of continuous casting extrusion and isothermal extrusion technology to produce flux cored wire, continuous casting technology can be homogeneous, composition and stability of the "Lotus" ingot, isothermal extrusion technology can fill factor to obtain a stable rough flux-cored wire .

2 of ingot casting and flux-cored isothermal extrusion

Laminar flow is extrusion of aluminum containing active solder flux ingot to form laminar flow extrusion, aluminum-free solder other group element cast in the form of porous ingot casting, ingot diameter and the hole size constant, the activity of flux within the hole to fill and compacted.

After compaction of the tablet containing the active solder flux has the following characteristics: at different cross-section, the proportion of constant flux and solder; activity can be added to enhance the flux of particles (eg SiC) to form a composite material; full package solder flux is deposited .

Laminar flow extrusion process technology is the key order of solder flux and flow, the formation conditions of the order flow is consistent rheological properties of two materials, the rheological properties of the stress associated with temperature and pressure, adjust the extrusion temperature and extrusion Stress can make two different rheological properties of materials similar to well-designed extrusion die shape can always make the two materials form stable laminar flow deformation.