Welding in mechanical services refers to the process of joining two or more metal parts together by heating the surfaces to the point of melting and fusing them together. Welding is a critical component of many mechanical systems, such as heating, ventilation, air conditioning (HVAC), and plumbing, and is used to fabricate and repair metal components. Welding services can be performed on site or in a welding shop, and require specialized equipment and highly trained welders. Welding in mechanical services must meet specific quality standards and codes to ensure the safety and reliability of the systems being worked on. Welding plays a critical role in the construction, maintenance, and repair of mechanical systems and is an essential aspect of the mechanical services industry.