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J-B Weld (stylized as J-B WELD) is the name of their flagship product: a specialized, high-temperature epoxy adhesive for use in bonding materials together. The company has run advertisements showing engine block repair with J-B Weld. [2] The J-B Weld Company, founded in 1969 by Sam Bonham in Sulphur Springs, Texas, specializes in epoxy products.
At Coventry cathedral, Araldite adhesive was used to bond its columns and fins, while at Sydney Opera House, Araldite adhesive was used to bond the rib sections of the shells, since a traditional concrete joint would have slowed construction, as it would need 24 hours to cure before stressing.
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.
The elimination of welds got rid of thermal cycles, weld starts and stops, and possible weld discontinuities such as undercut, overlap and cracks that can severely decrease the fatigue life of the structure. All of the above-mentioned advantages make joining with adhesives very advantageous in many applications.
The molten powder ‘flows’ into the profile and bonds with the steel. The molten powder will become a solid coating, when the ‘gel time’ is over, which usually occurs within few seconds after coating application. The resin part of coating will undergo cross-linking, which is known as “curing” under the hot condition.
B-staging is a process that utilizes heat or UV light to remove the majority of solvent from an adhesive, thereby allowing a construction to be “staged”.In between adhesive application, assembly and curing, the product can be held for a period of time, without sacrificing performance.
Common powders cure at 200 °C (392 °F) object temperature for 10 minutes. In European and Asian markets, a curing schedule of 180 °C (356 °F) for 10 minutes has been the industrial standard for decades, but is nowadays shifting towards a temperature level of 160 °C (320 °F) at the same curing time.
Dip-dab method. A surface to be joined is dipped into a vat of solvent, with the solvent depth being a controlled variable, for a set amount of time. Once the part has been removed from the vat, a screen mesh or foam pad is used to remove the excess solvent before the bonding surfaces are paired. Solvent dispenser method.
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