Hitsausta

Hitsausta is the process of permanently joining metals by heating them to or above their melting point and allowing the parts to fuse, often with a filler material. It covers a range of technologies that create a metallurgical bond through heat, frequently with shielding to protect the molten metal from oxidation. The most common welding methods today are arc welding, resistance welding, and solid-state welding. Arc welding uses an electric arc as the heat source and includes shielded metal arc welding (SMAW, known as stick welding), gas metal arc welding (GMAW or MIG/MAG), gas tungsten arc welding (GTAW or TIG), and submerged arc welding (SAW). Resistance welding relies on electrical resistance and pressure, and includes spot and seam welding. Solid-state welding methods, such as friction stir welding, join metals without melting the base materials.

Equipment and consumables vary by method but typically include a power source, electrodes or filler wire, shielding gas for MIG/TIG, clamps, and protective gear. Safety is a major aspect, with risks including burns, electric shock, UV radiation, toxic fumes, and fire hazards. Appropriate personal protective equipment and ventilation are essential, along with training and adherence to welding codes and standards.

Applications of hitsausta span construction, shipbuilding, automotive manufacturing, machinery repair, and metal fabrication. Quality welding requires clean joints, proper fit-up, correct heat input, and knowledge of material properties to avoid defects such as porosity, cracks, or lack of fusion.