Explore the causes of local melting defects after the workpiece is quenched and heat treated using a 120kw ultrasonic induction heating machine

When the workpiece is quenched and heat treated using a 120kw ultrasonic induction heating machine, affected by various factors, the workpiece may have some common defects, such as insufficient hardness, deformation, cracks, and local melting. These defects may affect the service life of the workpiece at least, or cause the workpiece to be scrapped at worst. Therefore, it is crucial to understand the causes of defects. Today, we will explore the causes of local melting defects.

Partial melting of the surface of induction hardened parts is a serious defect and often causes the workpiece to be scrapped. The causes of localized melting include the following.

1) Workpiece material defects. For castings with pores and cracks, it is often seen that the local temperature is obviously too high during the heating process. The greater the heating speed, the faster this melting occurs.

2) The sensor is in contact with the surface of the heated workpiece because the gap is too small, or the gap is unstable or changes during the heating process. The 120kw ultrasonic induction heating machine has a grounding protector, which can avoid such quality accidents. However, in low-volume production applications, a protective insulation layer, such as spraying ceramic coating, can be used between the sensor and the workpiece to reduce the occurrence of this situation.

Only by understanding the causes of defects can we formulate relevant preventive measures. Therefore, exploring the causes of melting defects is of great practical significance to ensure the quality and normal use of workpieces.