Welding with an electric soldering iron, hard copper wire and soft copper wire are different. Hard copper wire is usually used in applications that require higher strength and stiffness, such as construction and mechanical industry. Hard copper wire is usually more difficult to process and bend than soft copper wire. When welding hard copper wire, it is necessary to use higher power soldering iron and higher welding temperature to ensure the welding quality and durability. Flexible copper wire is usually used in applications that require better bending and twisting performance, such as electrical and electronic industries. When welding soft copper wire, it is necessary to use a low-power soldering iron and a suitable welding temperature to avoid deformation or scorching of the wire due to overheating. Therefore, when welding hard copper wire and soft copper wire with electric soldering iron, it is necessary to adjust the welding temperature and power according to the different characteristics and application requirements of materials to ensure the welding quality and durability.