What is a low-frequency pulse? What types of welding are they suitable for?

Low-frequency pulsed current refers to pulsed current with a frequency range of 0.5~30Hz. In welding, it achieves the flickering phenomenon of the arc through periodically changing current; that is, the arc burns intensely at peak current and dims at base current, thereby reducing heat input and precisely controlling the formation of the molten pool.

Applicable Welding Types
Material Range: Primarily used for TIG welding (tungsten inert gas welding) of non-ferrous metals such as stainless steel, steel, and titanium, especially suitable for heat-sensitive materials, reducing the risk of welding cracks.

Workpiece Thickness: Suitable for thin plates or ultra-thin parts (down to 0.1mm), as the low arc energy effectively controls thermal deformation.

Process Requirements: Enables all-position welding and single-sided welding with double-sided forming; commonly used for back-end welding of medium and thick plates.

Core Advantages
Heat Input Control: Average current is approximately 20% lower than conventional TIG welding, reducing the heat-affected zone.

Weld Quality: Fast molten pool solidification, dense microstructure, and minimal dendritic crystal formation.

Arc stability: It can maintain arc stiffness even under low current and avoid arc drift.