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。
Cooling the profile by immersing and pulling it through a water tank is faster but creates a zone of heated water around the profile, which inhibits heat transfer.
把型材浸没于水中通过一个水箱拉动的冷却方法，会在型材周围建立一个热水区，这个热水区会阻碍热交换。
Nitride precipitation is the primary type of nitrogen loss in the heated affected zone during welding process.
焊接加工时热影响区氮化物析出是固溶氮的一种主要损失方式。
Options include heated leather seats, dual-zone climate control and bi-xenon headlights.
自选配置包括加热真皮座椅、双区域空调及氙气头灯。
Options include heated leather seats, dual-zone climate control and bi-xenon headlights.
自选配置包括加热真皮座椅、双区域空调及氙气头灯。
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