What does it mean for a filler metal to be "low-fuming" during brazing?

A filler metal described as "low-fuming" during brazing indicates that it produces minimal smoke or residue when heated. This characteristic is particularly important in processes where minimizing airborne contaminants or maintaining a clean work environment is essential. Low fuming filler metals help in achieving cleaner welds and reduce the need for extensive post-brazing cleaning, which can be beneficial in industries that require high precision and cleanliness in their joints.

The focus on low fuming properties is crucial as it assists in maintaining visibility and safe working conditions, especially in enclosed spaces. While other factors like melting point, cost, and temperature applications can also influence the choice of filler metals, the defining characteristic of "low-fuming" is specifically related to the reduction of smoke and residue during the brazing process. This understanding helps professionals select the right filler metal based on operational and environmental needs.