A handheld welding machine is a portable tool used for manual welding operations. It includes a welding power source, electrode/wire, and handle for easy use. It's commonly used for small-scale welding in automotive, construction, and metal fabrication industries. It offers flexibility, portability, and ease of use, making it ideal for tight spaces. Handheld welding machines use various welding processes like arc welding, MIG welding, or TIG welding, depending on the model and application requirements.