What are joining processes? Joining processes are the processes that are used for joining metal parts and metal fabrication work. It tensors of 4 types. A, welding, B, solvering, C, praising, and E adhesive bonding. One of the only important joining processes is welding. It is classified into 5 important types. Namely, gas welding, arc welding, assistance welding, solid state welding and thermochemical welding. In general, welding has a large number of advantages, such as mechanizability, neometall strength, maneuverability and low cost, which easily overshadows disadvantages like harmful emissions, skill workmanship requirement, etc. Welding is used in the construction of aircraft parts, automobile parts, welding parts, pressure vessels, tanks, rail ore equipment, ships, pipelines and pretty much everything where cheap and strong metal to metal joining is required. The first type of welding is gas welding, which uses combustion heat or fuel gas mixture like oxygen and acetylene, a typical system consists of 2 cylinders. One with oxygen and other with acetylene, the flame of the torch is controlled by using a control valve. A filler rod is also added for increased strength. The flame reaches at a temperature of 3200 degree celsius and thus can melt all commercial metals. The former company had won. Gas welding has a lot of advantages like mobility, low cost, self-sufficiency and a minor of applications, but is limited by the time taken and skill required for perfect flame. Surge of gases, health problems, etc. The second type of welding is arc welding. Here, welding heat is obtained from an electric arc between an electrode and the workpiece. The temperature ranges from 6000 degree to 7000 degree celsius. Arc welding contains 3 important welding types, namely, first submerged arc welding, in which the arc electrode is hidden under a blanket of flux. The continuously fed bay metal melts and adds as a filler rod. Advanis is include high welding speed and smooth weld finish. This advantages include flux contamination. Second comes tungsten in earth glass welding or TIG welding. It is an arc welding process where coalescence is produced by heating the workpiece with an electric arc struck between tungsten electrode and workpiece. Advanis is include better controlled on welding process with a drawback of high-cost equipment. Third in line is metal inner gas or MIG welding. Here two coalescence is achieved with a metal electrode. Advanis is include faster production speed, deep penetration with a compromise in complexity. Next in welding process is resistance welding. Here coalescence is produced by heat obtained from resistance offered by the workpiece to flow off electric current in a circuit of which the workpiece is a part. The electrodes are mostly made up of copper alloys. Advanis include high rate of production, less scale requirement, but is limited by high equipment costs and special surface preparation requirement. The fourth type of welding is soil state welding. Here coalescence is produced by the heat obtained from mechanically induced sliding motion between rubbing surfaces. Advanis include single operation, less time requirement, no smoke with a limit on dimension of workpiece. Fifth and last is thermochemical or thermite welding. Here coalescence is achieved by heating with superheated liquid metal and slag resulting from chemical reaction between metal oxide and aluminium leading to an exothermic reaction. Advanis include no electricity requirement, but is only applicable for ferrous metal parts of heavy cross sections. Weld joints can be mainly classified as lab of fill joint, but joint, 8 joint, 8 joint and corner joint. Weld abilities defines the capacity of metal to be welded under fabrication conditions, imposed here to a specific and suitably designed structure and to perform satisfactorily in the structure. Last part in welding is welding defects, namely undercut cracks, porosity, slag incultions and the lack of fusion. Their main cause is being improper welding, base metal and also wrong welding procedures. The second type of joining process is adhesive bonding which is the process of joining materials by using adhesives. The adhesives used are mainly thermochastic or thermositting adhesives. Advanis include high joint strength, less localized stress concentration and low cost, but is limited to the temperature below 177 degree Celsius. Due to its ease of use, it is used primarily in all industrial and domestic applications. Third type of joining process is soldering, in which coalescence is produced by heating the rod to a suitable temperature and by using a filler metal with a melting point below 427 degree Celsius, it is used vitally in the semiconductor industry due to the simplicity and low cost. The fourth type of joining process is bracing. Here, metallic parts are joined using non ferrous filler metal and is hence used in areas like pipes, heat exchangers, etc. The fifth and final type of joining process is riveting, which is a permanent fastened method. There are 5 basic types of rivet heads, namely snap or couple head, pan head, counter sun head, half counter sun head and conical head rivet suffer almost no stress on the workpiece due to the absence of heat and hence require almost no skill but require high amounts of cover plays to support the rivet. Hence comes the end of the quick revision of joining processes. Finally, it's time for this episode's question. What do you mean by coalescence? Also, it's time to answer our last episode's question. What are MDMs? MDMs or multitasking machines are CNC machines with many axes that combine turning, milling, grinding and material handling into one highly automated machine tool. So like, subscribe and comment with your feedback to help us make better videos. Thanks for watching. In the next episode of Mechanically Engineering Insiders, find out what power of metallurgy is.