What is the fusion ratio of weld metal?

The fusion ratio of a weld metal refers to the volumetric proportion of the base metal in the weld metal, that is, the mixing ratio of the molten base metal to the filler metal (e.g., welding rod, welding wire, etc.).

Definition
The fusion ratio is the ratio of the cross-sectional area of ​​the melted base metal to the total cross-sectional area of ​​the weld, reflecting the composition ratio of the base metal to the filler metal.

Influencing Factors
Welding Method: Different processes, such as gas metal arc welding and manual metal arc welding, can affect the fusion ratio.

Groove Shape: Different groove designs, such as V-grooves and U-grooves, can alter the base metal's molten area.

Heat Input: Parameters such as welding current and arc voltage directly affect the degree of fusion.

应用领域
Adjusting the fusion ratio can optimize weld performance, for example:

Reducing base metal dilution (e.g., reducing the fusion ratio for base metal with a high carbon content)

Ensuring surface properties (e.g., controlling the fusion ratio to maintain surface hardness during overlay welding)