What defects are likely to occur when using high-frequency induction heating machine for heat treatment of liquefied gas storage tanks?

Liquefied gas storage tanks have to withstand high stress and erosion during work. In order to meet their working needs, we often use high-frequency induction heating machines for heat treatment. However, during the operation process, the workpiece is affected by many factors. Some heat treatment defects may occur. Today, the editor will tell you what are the common defects?

① The reasons for cracks after welding are: a. Insufficient preheating during welding, large temperature difference between inside and outside. b. The stress relief annealing heats up or cools down too quickly, resulting in new stress concentration. c. The annealing temperature is low or the insulation time is short, or the insulation layer effect is poor. According to the above possible reasons, a high-frequency induction heating machine should be used to preheat the weld, control the heating or cooling speed, and ensure uniform and complete removal of welding stress. The external insulation layer should meet the requirements.。

②Distortion of the tank. Most of them are related to improper placement or failure to consider its own weight, as well as expansion during the annealing process. Therefore, the bottom support and elongation auxiliary work should be done as required.

This article briefly talks about the common defects of liquefied gas storage tanks during high-frequency heat treatment. Therefore, we must be serious and careful when performing heat treatment to avoid such defects in liquefied gas storage tanks.