Material for rail of crane is of strong strength because of high carbon content, but of poor weldability, which makes more cracks. Strict technique is required in such welding.
Most of the cracks would propagate along the direction of plastic flow into the inside of the rail.
在靠近钢轨表面一定的深度内，裂纹萌生后基本上沿着塑性流变的方向向钢轨内部斜向下扩展。
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This paper mainly analyzes the process of bloom casting for heavy rail and internal cracks like central crack and so on in order to solve the internal quality problems.