Fillet weld root penetration
Fillet weld root burn occurs when the weld metal near the root fusion zone is excessively oxidized or burnt. This leads to a lack of fusion and can cause cracks and destruction of the part structure.
Physical-Chemical Mechanism of Action
Fillet weld root burn results from excessive oxidation or burning of the weld metal near the root fusion zone. This can be caused by excessive temperature, insufficient deoxidation, or lack of shielding.
Metallurgical Relevance & Risks in Welding
Root burn leads to a lack of fusion between the root and the weld. This can cause cracks, destruction of the part structure, and reduced mechanical strength. Additionally, it can lead to corrosion issues or chemical reactions with surrounding materials.
Workshop Practice & Instructions
To avoid root burn, it is important to control and regulate the temperature of the root pool. Use sufficient deoxidizers such as silicon or potassium fluoride. Ensure that the weld metal does not come into direct contact with air. If necessary, a protective spray can be used.