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提出了三通管接头的无外控充液增压挤胀成形新工艺，论证了该新工艺的实现条件和工艺措施。经生产实践，经济效益良好。
The new technology of non-controlled filling and pressurizing expansion forming of the tee joint was put forward, and the realization conditions and technological measures of the new process were demonstrated. The production practice, good economic returns.