单词：parent metal
parent metal的用法和样例：
例句
- After welding is complete, they shall be removed flush with the base metal without undercutting.焊接完成后，应清除这些临时部件至与母材金属表面齐平，不得出现咬边。
- The results show that certain thickness of the base metal and the regime of heat treatment will increase the peak hydrogen concentration and promote the tendency of disbonding.结果显示，一定的母材厚度和焊后热处理条件，使熔合线附近氢浓度峰值提高，从而使氢剥离倾向增大。
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