All-position automatic welding process for tube sheet of heat exchanger

作者：Wang, Zhen-Min^*; Zhang, Dong; Li, Jin; Huang, Shi-Sheng

来源：Journal of South China University of Technology(Natural Science Edition), 2010, 38(5): 100-104.

DOI：10.3969/j.issn.1000-565X.2010.05.020

• Automatic welding
• Optimal conditions
• Rotating speed
• Thermal power generating units
• Titanium alloy tube
• Welding process
• Welding quality
• Welding systems

In this paper, the characteristics of the all-position automatic welding process for the titanium alloy tube sheet of heat exchanger were analyzed in detail, and some experiments were carried out by using a self-developed full-digital tube sheet welding system. Then, the effects of the main process parameters on the welding quality were explored, and optimal conditions for the welding were determined, that is, a peak current of 80~100A, a base current of 20~30A, a pulse current frequency of 5~10Hz, a duty ratio of 50%, a rotating speed of 3~4r/min and a pulse mode for the current rising and falling. Finally, the correctness of the optimal conditions was verified by the on-site welding of tube sheet of heat exchanger for a 1GW supercritical thermal-power generating unit.

• 出版日期2010-5
• 单位华南理工大学