Deposition rate
The deposition rate indicates how much filler material is introduced into the weld pool per unit time. It affects the economy and quality of the weld.
Physical-Chemical Mechanism of Action
The deposition rate refers to the mass flow of filler materials, such as silicon or titanium, into the molten weld pool. These additions are made to influence certain properties of the microstructure, such as strength or toughness.
Metallurgical Relevance & Welding Risks
A deposition rate that is too low can result in insufficient filler material entering the weld pool, so its desired effects are not fully achieved. This can lead to inadequate deoxidation or poorer mechanical properties of the weld. On the other hand, a deposition rate that is too high can cause overdosing, leading to phase transformations or excessive carbon loss in the weld, which in turn reduces mechanical properties and can cause cracks.
Workshop Practice & Instructions
Set the deposition rate so that the filler material remains in an optimal concentration range in the weld pool. This means the feed rate per unit time (e.g., kg/h) must be precisely controlled and maintained. For silicon, the typical range is usually between 0.1% and 0.5% of the weld metal. For titanium or other fillers, the optimal range can vary and should be determined according to the specific requirements and the metal being welded.