The reason of welding phenomenon in aluminum alloy die casting technique
In all the factors that have caused the aluminum die-casting process of beilun, the problem of welding and welding has been paid more and more attention. "Welding" is the term in the industry, which refers to the reaction between the die and the alloy. Once the surface of the die is welded, it will produce a complex of fe-al compounds and cause defects on the casting surface during the next die-casting cycle.
Partial hard between the metal in the mould surface Chen Ji, so you must interrupt production and polishing method to remove solder products, this will let the production period lengthen, labor waste, but also reduce the die life. It is usually divided into two types according to the form of welding.
"Impact welding" is where welding occurs in the inlet or inner gate of the mold surface facing the cavity. These areas when filling is general by the molten metal flow dramatic impact, the surface temperature is higher, the pressure is bigger, protective layer, fragile under the constantly scouring of the alloy mould of protective layer to be null and void, and showing the metal substrate alloy with matrix material react to generate complex of intermetallic compounds.