Structural characteristics of electrodes in intermediate frequency spot welding machines

The electrode structure of intermediate frequency spot welding machine mainly consists of three parts: head and tail, rod and tail. Next, let’s take a look at the specific structural characteristics of these three parts.

The head is the welding part where the electrode contacts the workpiece, and the electrode diameter in the welding process parameters refers to the working surface diameter of this contact part. The standard straight electrode for spot welding has six types of head shapes: pointed, conical, spherical, curved, flat, and eccentric, and their shape characteristics and applicable situations.

The rod is the substrate of the electrode, mostly a cylinder, and its diameter is abbreviated as electrode diameter D in processing. It is the basic size of the electrode, and its length is determined by the welding process.

The tail is the contact part between the electrode and the grip or directly connected to the electrode arm. It is necessary to ensure smooth transmission of welding current and electrode pressure. The contact resistance of the contact surface should be small, sealed without water leakage. The shape of the tail of the spot welding electrode depends on its connection with the grip. The most commonly used connection between the electrode and the grip is the tapered shank connection, followed by the straight shank connection and the threaded connection. Correspondingly, there are three types of shapes for the tail of the electrode: conical handle, straight handle, and spiral.

If the taper of the handle is the same as the taper of the grip hole, then the installation and disassembly of the electrode is simple, less prone to water leakage, and suitable for high pressure situations; The straight handle connection has the characteristic of quick disassembly and is also suitable for welding under high pressure, but the electrode tail should have sufficient dimensional accuracy to closely match the grip hole and ensure good conductivity. The biggest drawback of threaded connections is poor electrical contact, and their service life is not as good as that of tapered shank electrodes.