Kerf burr formation
Kerf burr formation is the adherence of solid metal droplets or slag to the cut gap. This occurs when the process gas energy is too low to remove the melt.
Physical-Chemical Mechanism of Action
Cut joint burr formation occurs due to insufficient melting of metal droplets or slag at the cut joint. The process gas does not have enough kinetic energy to melt and wipe them away.
Metallurgical Relevance & Welding Risks
Burr formation can lead to uneven stresses that may cause cracking. It also impairs the mechanical strength of the weld and can lead to corrosion issues.
Workshop Practice & Action Instructions
To avoid burr formation, increase the process gas energy by raising the gas pressure or temperature. Make sure the melt pool size is large enough to melt and wipe away all metal droplets. In severe cases, an additional melt layer or a different melting strategy may be required.