hitsaussuu

Hitsaussuu is a Finnish term that translates to "welding nozzle" or "welding tip" in English. It refers to the component of a welding torch that guides the shielding gas and the welding wire (in the case of wire-fed welding processes) to the weld pool. The primary function of the hitsaussuu is to protect the molten metal from atmospheric contamination by creating a flow of inert or semi-inert gas around the arc.

Different welding processes utilize different types of hitsaussuu. For MIG (Metal Inert Gas) and MAG (Metal Active Gas) welding, the hitsaussuu is typically a consumable copper or brass part that is threaded into the torch body. It has a precisely sized orifice through which the welding wire passes and a surrounding recess for the shielding gas to exit. The size of this orifice is critical, as it influences the wire feed rate and the gas flow pattern.

In TIG (Tungsten Inert Gas) welding, the term hitsaussuu is less commonly used for the gas nozzle, which is usually made of ceramic or alumina. These nozzles are designed to control the flow of shielding gas to protect the tungsten electrode and the weld pool. While the function is similar, the design and material differ significantly from those used in wire-fed processes.

The condition of the hitsaussuu is important for maintaining weld quality. Wear and tear, spatter buildup, or damage to the orifice can disrupt the gas flow, leading to porosity, oxidation, or other weld defects. Therefore, regular inspection and replacement of the hitsaussuu are essential maintenance procedures for welding operations.