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Joining of Metals
Published in Sherif D. El Wakil, Processes and Design for Manufacturing, 2019
Explosive welding is another technique that produces solid-state joints and, therefore, eliminates the problems associated with fusion welding methods, like the heat-affected zone and the microstructural changes. The process is based on using high explosives to generate extremely high pressures that are, in turn, used to combine flat plates or cylindrical shapes metallurgically. Joints of dissimilar metals and/or those that are extremely difficult to combine using conventional methods can easily be produced by explosive welding.
Joining Technologies
Published in Raghu Echempati, Primer on Automotive Lightweighting Technologies, 2021
Explosion welding is a solid-state welding process where coalescence is accomplished by the high-velocity impact of one of the components onto the other part. Figure 6.9 [13] shows the schematic of the explosion welding process. Figure 6.10 [14] shows a sample part made using this process. The moving part is accelerated by a controlled detonation of chemical explosives. Due to the nature of this process, the producible joint geometries must be simple (typically plates or tubes).
Power Connectors
Published in Paul G. Slade, Electrical Contacts, 2017
Explosive welding is a cold weld pressure welding in which the controlled energy of a detonating explosive is used to create a metallurgical bond between two or more similar or dissimilar metals. No intermediate filler metal, that is, brazing compound or soldering alloy is needed to promote bonding, and no external heat need be given. Diffusion does not occur during bonding. As a consequence of the high-velocity collision of the two metals, the contaminant surface films are jetting off the base metals. The best attribute of the explosive welding is that dissimilar metal systems can be bonded even when conventional fusion welding techniques are metallurgically unacceptable because of the formation of intermetallic compounds. The most common use of explosive welding is the production of corrosion resistance clad metals and transition joints used to aid dissimilar metal welding. This technique has been used for splicing the overhead transmission lines [170]. The explosively welded connectors are completely metallic, void free and offer a totally compressed uniformly smooth and straight fitting without bird caging the conductor. The explosively welded connectors are completely metallic, void free, and offer a totally compressed uniformly smooth and straight fitting without bird caging the conductor. However, despite the apparent advantages of this technique for splicing the transmission lines, there is a number serious disadvantage such as the safety of the personnel during installation and considerable noise which limits the use of this technique in highly remote geographic locations. During the explosive welding of high residual stresses are brought forth in the bond zone that can significantly increase the creep and stress relaxation of a joint, hence, annealing is required to remove these stresses. Furthermore, because of the high pressures generated in the bond zone will exceed the dynamic yield stress of the metals and they will flow plastically during the procedure.
Effects of ECAR process on the mechanical properties of explosively welded Al/Cu/Al
Published in Australian Journal of Mechanical Engineering, 2022
Sina Ghaffari, Suraya Tahir, Azmah Hanim Mohamed Ariff, M. I. S. Ismail
Today, using multilayer sheets in various industries such as aviation, aerospace, nuclear and food industries is taken into consideration. These new materials have superior properties such as corrosion and wear resistance with better mechanical properties (SAA and Farhadi Sartangi 2009). The explosive welding method is considered by many researchers and industrialists as a suitable technique for connecting heterogeneous sheets which can produce an extensive variety of materials in substantial amounts (Durgutlu, Gulenc, and Findik 2005; Honarpisheh, Niksokhan, and Nazari 2016). Explosive welding is used as an excellent alternative for joining dissimilar metals and alloys at solid state (SAA and Farhadi Sartangi 2009). Even though other techniques can be used to weld dissimilar metals (Zhu and Xuan 2010a, 2010b), the explosive welding process, to join a wide variety of both similar and dissimilar metals such as aluminium, titanium, copper and stainless steel (Findik 2011; Crossland 1976). The high strength of bonding is one of the main advantages of the explosive welding process (SAA, STS, and Atkins 2008). In this method, the impact causes work-hardening on the materials (Mamalis et al. 1994).
Investigation on alkali corrosion resistance of 310s + WC coatings prepared by PTA
Published in Surface Engineering, 2020
Guodong Zhang, Yandong Liu, Yicheng Zhou, Qiyu Wang, Bopin Xu, Jia’nan Zhou
Explosive welding achieves metallurgical bonding between plates through impact force generated by the explosion. This method can combine two pieces of metal with a great difference, and the produced composite plate will not change the state and composition of the two original materials, thus achieving the best performance of the composite plate. However, explosive welding has the problems of high technical requirements, difficult control of precision and the like [9]. There are also many surface modification technologies that have their own advantages and disadvantages. For example, laser cladding has a small heat-affected area and is easy to achieve automation. However, due to fast heating and fast cooling, pores and uneven hardness are easily formed. Plasma surfacing technology uses the plasma generated between the cathode of the tungsten needle and the anode of the substrate as a heat source to melt the self-fluxing alloy powder and the surface of the substrate at the same time and recrystallize the surfacing layer with good metallurgical bonding [10,11]. It has the advantages of high deposition rate, low dilution rate, good molding, etc.