Why is a transformer-rectifier often preferred for SMAW?

A transformer-rectifier is often preferred for Shielded Metal Arc Welding (SMAW) because it provides a stable and consistent DC output, which enhances arc stability and improves weld quality. Additionally, transformer-rectifiers are more compact and efficient than traditional transformer-based systems, making them easier to transport and operate in various environments. Their ability to handle a wide range of input voltages and their durability also contribute to their popularity in SMAW applications.