The traditional tube expander process is a combination of welding or expansion welding. However, this process consumes a lot of energy, has high labor intensity, and uses different materials for pipes and tube sheets, and the combination process is complicated. Developed by Yangzi Petrochemical Company, the YZ type tube expander (patent No. 90208541·X) produced by Huangqiao Special Expander Factory in Taixing County, Jiangsu Province belongs to the double-bearing receding light-duty mechanical expansion tube tool.
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