Brazing of aluminium alloy welding procedure 】 【 6063 aluminum alloy
Brazing of aluminum brazing filler metals and aluminum alloy plate.When soldering, brazing material not melt, solder melt filling joint, connect artifacts.Can be aluminum solder coating on aluminum alloy core material made from aluminum alloy brazing sheet, widely used in the manufacture of heat exchanger.
The low melting point of aluminum solder al-si series alloy, liquidity is good, suitable for solder.Typical aluminum solder is 4347, 4047 (American brand, can choose the LuKe brazing material) and 4004 alloy.
Industrial pure aluminum, aluminum manganese alloy and aluminum - magnesium - silicon alloy in 6951 (American brand) alloys have good brazing performance, they can use the aluminum solder brazing.Aluminum magnesium silicon department in 6061, 6053 (American brand) and 6063 alloy also have good brazing performance, but because they start melting temperature than the industrial pure aluminum and aluminum manganese alloy is low, so we will strictly control brazing temperature, to prevent the burnt.4004 solder containing magnesium, suitable for use in vacuum brazing method, in the process of brazing, magnesium reaction with furnace residue of oxygen and water vapor, purifying effect, magnesium vapor also inhibit by reoxidation of brazing aluminium alloy.
Can use foreign LuKe magnesium, aluminum, silicon solder paste.
Aluminum alloy brazing sheet is usually by the department of aluminum manganese alloy (China brand 3 a21, 3003) core material and aluminum solder coated layer of composite panels, the manufacturing process is that the aluminum solder plate on the one side or two sides core material ingot billet, preheat to hot rolling temperature (500 ℃), hot rolled, cold rolled sheet, again cladding layer completely bonding to the core material.The thickness of coating layer for the thickness of the core material of 5% ~ 15%.
Aluminum alloy brazing sheet is usually as a component of soldering components, another part is no cladding layer can brazing aluminium alloy material.Brazing, the component is placed within the furnace or salt bath evenly heated to high temperatures, melting brazing solder on the board, by capillary action and gravity flow, fill to connect parts of a joint, can be welded to hundreds or more contacts at the same time.They are widely used in the manufacture of all kinds of heat exchangers.
Type aluminum alloy construction materials mainly adopts aluminum - magnesium - silicon alloy material of two kinds of typical 6061 and 6063.Especially in 6063 alloy with the most, because its production process is simple, good for the comprehensive performance of alloy.
6063 belong to low alloy aluminum - magnesium - silicone high plastic alloy, has the following main advantages: (1) with moderate intensity after heat treatment, high impact toughness, is not sensitive to gap;(2) have good thermoplastic, can high speed extrusion into various section of complex thin-walled hollow profile, wide range of quenching temperature, the quenching sensitivity small, thin wall profiles can be directly on the extrusion machine air cooling quenching;(3) good welding performance, can be welding, arc welding, resistance welding and brazing, good corrosion resistance, no stress corrosion cracking tendency;(4) easy to anodic oxidation coloring.Defect is parked effects, such as parking at room temperature for a period of time after quenching, will affect the strength of the alloy after aging.
6063 alloy in the role of the main elements: magnesium and silicon as the main strengthening elements, form the strengthening phase Mg2Si, alloy of Mg2Si mass fraction of 0.8% or so, Mg/Si = 1.73, if the excess magnesium Mg2Si solubility in the alloy will be significantly reduced and the intensity of the fall;If the silicon excess, can make the strength increase, but will reduce the corrosion resistance of alloy and anode oxidation membrane.Chromium and manganese can improve the corrosion resistance of alloy, reduce the "parking effect".Titanium can refine casting and weld tissue, reduce the hot cracking tendency to improve elongation.High content of copper can improve the strength, but will reduce the corrosion resistance, since 6063 mainly used in architectural decoration, copper as impurity control.Iron content will damage the anodic oxidation film color, high oxidation after pitting appeared.Zinc in allowed range had no obvious effect on alloy properties.
