The petroleum resin sizing agent was prepared with modified petroleum resin as raw material by phase inversion emulsification at ordinary pressure.
以改性的石油树脂为原料，采用常压转相乳化法制备了石油树脂施胶剂。
It is efficient to eliminate the occurrence of transverse crack on weld by means of optimizing welding, sizing process and strictly control to inclusions class of raw material.
通过严格控制原料的夹杂物级别和优化焊接、定径工艺可以有效地消除焊缝横向裂纹的产生。
It is efficient to eliminate the occurrence of transverse crack on weld by means of optimizing welding, sizing process and strictly control to inclusions class of raw material.
通过严格控制原料的夹杂物级别和优化焊接、定径工艺可以有效地消除焊缝横向裂纹的产生。
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