Alloying Powder
Alloy powder is fine-grained metal powder used in powder or flux-cored wire processes to precisely control the chemical composition of the weld metal. It allows more accurate dosing of alloying substances and improves the properties of the filled weld.
Physical-Chemical Mechanism of Action
Alloy powder consists of fine metal particles that are injected into the molten weld pool during the flux-cored process. These particles react with the molten material and change its chemical composition. By precisely controlling the powder feed rate, the composition of the deposited weld metal can be accurately adjusted.
Metallurgical Relevance & Welding Risks
The use of alloy powder improves the strength, toughness, and other mechanical properties of the weld. It also reduces the susceptibility to cracking and hot cracking. However, inaccurate dosing can lead to over- or under-dosing of alloying elements, which can have negative effects on weld quality.
Workshop Practice & Action Instructions
To use alloy powder effectively, the powder feed rate must be precisely controlled. This requires correct setting of the spraying system and precise monitoring of the melting processes. Recommended feed rates vary depending on the material and application, but it is important to follow the manufacturer's instructions. If problems with dosing or weld quality arise, a calibration of the spraying system should be carried out.