What is a convex weld?

Convexity is defined as the maximum distance from the face of a convex fillet weld perpendicular to a line joining the weld toes. This distance is measured at the centerline of the weld and is usually expressed in inches. Convexity plays an important role in welding because it affects the strength and integrity of the weld.

What equipment is used for resistance welding?

Schematic diagram of resistance welding method The equipment used for resistance welding is called resistance welding machine. It includes spot welding machine, projection welding machine, seam welding machine, and butt-welding machine.

What is resistance welding?

Resistance welding is a method of welding by applying pressure to the weldment through electrodes and by using resistance heat generated by current passing through the contact points, also called contact welding. During welding, the workpieces are pressed between two electrodes, and a current is applied for a certain time.

What is the power supply for resistance welding machine?

The power supply for resistance welding machine could be alternating current, direct current, or pulse current. Alternating current frequency is divided into four types: low frequency (3–10 Hz), power frequency (50/60 Hz), medium frequency (150–8000 Hz), and high frequency (10–500 kHz).

What are the advantages of resistance welding?

The advantages of resistance welding are the formation of plastic connection or molten core surrounded by plastic ring connection. It has simple metallurgical process, short heating time, heat concentration, small heat-affected zone, small stress and deformation, and high welding quality.

How does welding work?

During welding, the workpieces are pressed between two electrodes, and a current is applied for a certain time. The resistance heat generated by the current passing through the contact surface and adjacent areas of the work-piece is used to heat it locally to the plastic state or melting state.