Manuaalisähköhitsaus

Manuaalisähköhitsaus, often referred to as manual metal arc welding (MMAW) or shielded metal arc welding (SMAW), is a widely used fusion welding process. It involves creating an electric arc between a consumable electrode coated with flux and the workpiece. The heat generated by the arc melts the electrode and the base metal, forming a molten pool that solidifies to create a strong weld joint.

The electrode typically consists of a metal core wire surrounded by a flux coating. As the electrode is consumed, the flux melts and decomposes, creating a shielding gas that protects the molten weld pool from atmospheric contamination, such as oxygen and nitrogen. The flux also provides deoxidizers and alloying elements to improve the weld metal quality. Additionally, it forms a slag layer over the solidified weld, which needs to be chipped away after welding.

Manuaalisähköhitsaus is a versatile process suitable for joining a variety of metals, including steel, stainless steel, cast iron, and aluminum. It can be performed in various positions and is often favored for its portability and relatively low equipment cost, making it suitable for field repairs and construction. The skill of the welder is crucial in controlling the arc, electrode angle, travel speed, and maintaining the correct arc length to achieve a sound weld. Different types of electrodes are available for specific applications, offering varying mechanical properties and suitability for different base metals and welding conditions.