Based on the limit analysis viewpoint, a formula that could be used to estimate the in plane limit moment of welded branch pipe Tee was derived in this paper.

基于极限分析的观点，推导了工业中焊制管道三通在面内弯矩工况下的极限载荷估算式。

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Based on the limit analysis viewpoint, a formula that could be used to estimate the out-of-plane limit moment of welded branch pipe tee was derived in this paper.

基于极限分析的观点，推导出面外弯矩作用下焊制三通的极限载荷估算公式。

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Developed excogitates of two decumbence and one horizontal molding die realized the increasing height of branch pipe of heat pressure tee.

研发出了两个横梁和一个水平成型模具，实现了热压三通支管高度的增加。

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