具有不大于焊脚尺寸的小开口焊缝，其所能承受的扭矩与相应闭合角焊缝所能承受的扭矩是几乎相同的。
Value of torsion for less than the size of fillet weld height of small-opening fillet weld is the same as that of corresponding closed fillet weld.
剖口——在一个工件或二个部件之间的表面的一开口或通道，用于熔敷焊缝。
Groove — an opening or channel in the surface of a part or between two components which provides space to contain a weld.
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