对以前提交零件不合格的纠正；
批量生产证明，采用电化学法退除钼层工艺可处理各种喷钼层不合格的零件。
Practice indicated that using electrochemistry treatment to remove molybdenum layer can handle the problems for those parts with unqualified molybdenum spraying layer.
指出铸造的毛坯件不合格及零件本身强度不高是产生裂纹的主要原因。
Pointing out the main reason of crack formation is that casting blank is not up to standard and the strength of parts is not enough.
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