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What is Seam Welding? – Working and Applications
The welding process in which two similar or dissimilar materials are joined at the seam by the application of heat generated from electrical resistance is known as seam welding. The seam welding is a types of resistance welding, in which weld is produced by roller electrodes instead of tipped electrodes.
Most seam welding processes produce a continuous or intermittent seam weld near the edge of two overlapped metals by using two machine driven roller electrodes. As in the seam welding process, the roller electrodes move over the metal workpieces, the workpieces are under pressure and the current passing through them heats the two workpieces of the metal to the melting point. Thus, this process, sometimes, also called the seam spot welding.
Resistance seam welding is one of the most common welding process used to join metal sheets with a continuous weld. In seam welding process, when two similar or dissimilar materials are pressed together, there will be a small gap between them because of irregularities in the metal surface. This gap causes an electrical resistance between the two materials and results them to heat up at the seam.
The schematic diagram of the seam welding process is shown in the figure.
In seam welding process, the welding current is the main parameter, i.e., the amount of heat generated at the seams depends upon the magnitude of welding current flowing through it.
Types of Seam Welding
The resistance seam welding is broadly classified into two types, viz. −
Intermittent Seam Welding – In case of intermittent welding, the weld occurs at specific spots rather than as a continuous line. This type of seam welding is useful for welding thick metals where a continuous weld is not possible.
Continuous Seam Welding – In continuous seam welding, an uninterrupted current flows through the electrodes and the metals to be joined are passed through the electrodes at a constant speed. As the workpieces remain under constant pressure, thus, it produces a uniform overlapping weld.
Advantages of Seam Welding
The chief advantages of resistance seam welding are listed below −
The welds produced by the seam welding are air-tight and water-tight.
Seam welding is a fast welding process and it can be automated using robotic machines.
It does not require any flux and filler materials.
Disadvantages of Seam Welding
Some disadvantages of resistance seam welding process given as −
As it has of roller electrodes, thus, only straight line or uniformly curved line welds can be made with the resistance seam welding.
It is not suitable for metal sheets of thickness more than 3 mm per sheet.
Applications of Seam Welding
The resistance seam welding is used in various applications, some of them are −
It is used for making lap joints.
It is used in manufacturing process of various types of pressure tight or leak proof tanks such as fuel tanks, oil switches, transformer tanks, aircraft tanks, etc.
Used for welding parts of vessels that need to be air tight and water tight.
For welding of pipes and tubes.
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