... weld metal cracking焊缝裂纹 weld metal zone焊缝金属区; 焊接金属熔化区 weld metal焊缝金属; 焊接金属 ...
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Weld metal zone are mostly acicular ferrite which can improve the weld zone toughness.
焊缝金属区晶粒分布均匀，焊缝金属区多为针状铁素体，能够提高焊缝区的韧性。
The tensile strength of welded joint is significantly improved after heat treatment and the failure occurred far away from the weld metal zone.
焊接接头抗拉强度大幅度提高，断裂均处在远离焊缝的母材上。
The result shows that the velocity field changes with the increase of space from shoulder and stir tool and the flow of weld metal from top to bottom and stir zone to rotation zone also weakens.
实验结果表明：随着距轴肩和搅拌针距离的增大，速度场开始减弱，焊缝金属由顶面向底面、由搅拌区向旋转区的流动也随之减弱。
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