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Aluminium alloys are often used due to their high strength-to-weight ratio, corrosion resistance, low cost, high thermal and electrical conductivity.There are a variety of techniques to join aluminium including mechanical fasteners, welding, adhesive bonding, brazing, soldering and friction stir welding (FSW), etc. Various techniques are used based on the cost and strength required for the joint.
Exothermic welding, also known as exothermic bonding, thermite welding (TW), [1] and thermit welding, [1] is a welding process that employs molten metal to permanently join the conductors. The process employs an exothermic reaction of a thermite composition to heat the metal, and requires no external source of heat or current.
As a result, the new metal has combined properties of the original two metals that can lead to more conductivity, strength, and durability. For example, explosion welding is most commonly used to join materials like stainless steel to copper (Blazynski, 1983). The product is a component that has thermal conductivity and structural stability.
The energy from the impact plasticizes the materials, forming a weld, even though only a limited amount of heat is generated. The process is commonly used for welding dissimilar materials, including bonding aluminum to carbon steel in ship hulls and stainless steel or titanium to carbon steel in petrochemical pressure vessels. [47]
The bonding process produces joints with a uniform composition profile, tolerant of surface oxides and geometrical defects. The bonding technique has been exploited in a wide range of applications, from the production and repair of turbine engines in the aerospace industry, [ 1 ] [ 2 ] [ 3 ] to nuclear power plants, [ 4 ] [ 5 ] and in making ...
Diffusion bonding or diffusion welding is a solid-state welding technique used in metalworking, capable of joining similar and dissimilar metals. It operates on the principle of solid-state diffusion, wherein the atoms of two solid, metallic surfaces intersperse themselves over time.
Solders have to be specially selected to avoid galvanic corrosion problems. Tin-zinc solders have proven to be reliable in joining aluminum to aluminum and aluminum to copper. [3] They most often require flux and brushing with a stainless steel brush to break oxide coating to achieve proper bond. Difficult: High alloy steel Stainless steels
Similar to BAg-1, more economical. For ferrous, nonferrous and dissimilar alloys. Free-flowing, for larger gaps, where fillets are desired. For steel, stainless steel, copper, copper alloys, nickel, nickel alloys, and combinations. Light yellow color. Maximum service temperature 204 °C, intermittently 316 °C. 26: 21: 35: 18: Ag 30 Cu 28 Zn 21 ...
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