如果固定环端面硬度低于HRC40，则应先在端面上重新堆焊一层硬质合金，经磨光后再装配。

If the set collar end hardness is lower than HRC40, should first on the end surface again a built-up welding hard alloy, after the polish repackaging.

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试样端面沿径向的等效应变和显微硬度不同，心部最小，边缘处次之，中间区域最大。

The strain-effective and microhardness of different regions in the specimen are different, the center region is smallest, the corner region is bigger, the middle region is biggest.

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