The size and shape of the welded nugget is determined by the size and the what?

The size and shape of the welded nugget is determined by the size and the what?

• A. Contour of the electrode face
• B. Thickness of the base metal
• C. Welding current
• D. Electrode material

Answer: (A)

In resistance welding, the shape and size of the nugget are governed by the contact geometry at the electrodes. The electrode face defines the area over which current concentrates and metal deforms under pressure, so the molten zone that forms (the nugget) tends to mirror that contour. A flat, circular electrode face yields a round nugget roughly matching that face, while any profiling on the electrode face will imprint its shape onto the nugget. The other factors influence the process but don’t set the nugget’s shape as directly. The thickness of the base metal affects how deep the nugget can form and what current/time is needed to weld through, but it doesn’t change the boundary defined by the electrode edge. The welding current controls how much heat is generated and can affect the nugget size, but the boundary remains the electrode’s contour. The electrode material influences heat transfer and wear, which can affect process stability, not the nugget’s geometry itself.

In resistance welding, the shape and size of the nugget are governed by the contact geometry at the electrodes. The electrode face defines the area over which current concentrates and metal deforms under pressure, so the molten zone that forms (the nugget) tends to mirror that contour. A flat, circular electrode face yields a round nugget roughly matching that face, while any profiling on the electrode face will imprint its shape onto the nugget.

The other factors influence the process but don’t set the nugget’s shape as directly. The thickness of the base metal affects how deep the nugget can form and what current/time is needed to weld through, but it doesn’t change the boundary defined by the electrode edge. The welding current controls how much heat is generated and can affect the nugget size, but the boundary remains the electrode’s contour. The electrode material influences heat transfer and wear, which can affect process stability, not the nugget’s geometry itself.