求翻译：type II boundary, where the hardness is much higher. The impact toughness of weld metal by MIG welding is higher than that by TIG welding.是什么意思？

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type II boundary, where the hardness is much higher. The impact toughness of weld metal by MIG welding is higher than that by TIG welding.

问题补充：

匿名	2013-05-23 12:21:38 II型边界，硬度高得多。 MIG焊焊缝金属的冲击韧性高于TIG焊接。

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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