多用塑料支架是由足、连接块、臂、面板四部分组成，通过称为凹接头和凸接头的不同装配，可以实现不同的用途。

The multi-use plastic support comprises feet, connecting blocks, arms, and a panel, which can be assembled differently by the called concave joints and convex joints to realize different usages.

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结果表明：在役焊接接头残余应力分布规律与常规焊接保持一致，符合管道焊接接头“内凸外凹”的变形机理，但在数值上差别较大。

Results show that distribution regularity of residual stress of in-service keeps coherent with routine welding, which measures up deformation mechanism of welding, but numeric value is different.

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