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What is seam welding? [SW01]

Dec 13,2023

What is seam welding? [SW01]

Seam welding operates under the principle of coalescence, uniting two metal sheets or workpieces through a series of overlapping spot welds.

The welding process in which two similar or dissimilar materials are joined at the seam by the application of heat generated from electrical resistance. 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.

seam welding 1

The resistance seam welding is broadly classified into two types,

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. Continuous seams are long, uninterrupted welds ideal for liquid-tight joints. Intermittent or stitch welding leaves gaps and is commonly used in applications that don’t require a hermetic seal.

The choice often hinges on the project’s requisite integrity level for the joined materials.

103 seam-welded-cylinder1