Effect of Weld Shape on Temperature Field of Nozzle Flowmeter

Abstract

Weld shapes significantly impact nozzle safety, and a number of accidents have occurred due to nozzle cracking. In order to improve weld safety and reveal the effect of weld shape on the temperature field of nozzle flowmeters, this study established four types of welds, with ten different weld shapes. Through numerical calculation, the effect of the weld shape on the temperature field in the solid domain was systematically studied when the flowmeter was passed through high-temperature gas. The results show that the taper angle and taper opening of the weld metal had a certain effect on the temperature distribution of the flowmeter, while the distance between the weld metal and eight-slot nozzle and the bottom width of the weld metal had little effect on the temperature distribution. The type C weld shapes of type III and type IV led to a sizeable high-temperature area at the junction of the weld metal and eight-slot nozzle, and the maximum temperatures of monitoring path 2 reached 689.54 °C and 693.29 °C. This study explored the temperature field distribution law under different weld shapes and parameters, providing guidance and serving as a reference for later engineering applications, and it has some significance in improving the safety of nozzle flowmeter welds and pipelines.