The results show that:under the no preheating condition, the microstructure of weld metal is columnar austenitic, and brittle martensite exists in the fusion zone and over-heated zone unavoidably.
研究结果表明：在不预热条件下，用KD286焊补钢轨，焊缝组织为柱状奥氏体组织，熔合区和过热区不可避免地产生脆硬的马氏体组织。
No preheating is required for P8 material in general. For the correct preheating and interpass temperatures, please refer to corresponding WPS.
对于P 8材料，一般不需要预热，关于正确的预热和层间温度的要求，参见相应的WPS。
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