The result showed that the crack forming was due to the billet metal in the subcutaneous blow holes were oxidated during heating process and could not be sticked.
结果表明：轮箍裂纹是由于钢锭中存在严重的皮下气泡，在轮箍热加工过程中皮下气泡处金属被氧化烧穿导致不能粘合而形成裂纹。
If installed outdoor, the aluminum alloy shell can be oxidated to be the same colour as the building so that the light will not influence the beauty of the building.
如果安装在室外，可根据客户要求把铝合金外壳氧化成跟楼体相同的颜色，不会因为安装灯具而影响楼体的美观。
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