These joining processes use an oxyfuel gas, such as a mixture of oxygen and acetylene, to produce a hot flame for melting the base metal and filler metal, if one is used. Seam welding, also called seam sealing or resistance welding, is the most popular and widely used process for hermetically sealing hybrid packages. Pdf a study on enhancement of circumferential seam. It is used for joining two or more sheets of metal. This study investigates the most important industrial welding processes for joining sheet metals focusing on their. The shunt effect of the closely spaced nuggets and the short weld times mean that higher currents. The welding process is divided into two major categories. The welding processes differ in the manner in which temperature and pressure are combined and achieved. A study on enhancement of circumferential seam welding process in boiler shell. In hindi seam welding process definition,principle. Stud welding projection welding threaded stainless studs to 0. Plastic welding or pressure welding and fusion welding or nonpressure welding. Projection welding process pdf resistance spot, resistance projection and resistance seam welding.
Sequence of a resistance spot welding process, figure 8. In seam sealing, the lid is positioned on the package and two truncated, coneshaped copper alloy electrodes fig. Joining of sheet metals using different welding processes. Mostly, these nuggets are formed in the form of butt or the overlapping welding components. Resistance seam welding description the seam welding process is an adaptation of resistance spot welding and involves making a series of overlapping spot welds by means of rotating copper alloy wheel electrodes to form a continuous leak tight joint. New circumferential seam welding method has been found to avoid the problems obtained by. Seam welding is a welding technique in which the two similar or dissimilar metals are connected by supplying an electric current and in this process a nugget formation takes place. The requirements on electrodes and surface finish are the same as for spot welding.
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